All Calculators

Every calculator on Calcumatix, in one place. Search by name, filter by category, or browse the full A to Z list below.

Popular Calculators

Age Calculator

Find exact age in years, months, and days from a birth date, with total days lived and a target date option for past or future checks.

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BMI Calculator

Calculate Body Mass Index from height and weight, and see your World Health Organization weight category.

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Grading Bell Curve Calculator

Rescale any raw exam score to a target mean using the linear z-score bell curve method, built for teachers and students.

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Solar Battery Calculator

Size your off-grid solar battery bank in amp-hours by entering your daily energy use, system voltage, autonomy days, and depth of discharge.

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Fraction Calculator

Add, subtract, multiply, or divide two fractions and see the reduced answer, decimal form, and working steps.

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Loan Calculator

Check a fixed loan payment, total paid, and interest cost from the loan amount, rate, and term.

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Battery Capacity Calculator

Find how many amp-hours a battery bank needs to support a given load, using voltage and maximum depth of discharge as sizing inputs.

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BMR Calculator

Estimate basal metabolic rate from age, sex, height, and weight, with metric or imperial inputs and a visible Mifflin-St Jeor example.

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Average Calculator

Find mean, median, and range from a list of numbers so students, teachers, and data readers can check center, middle, and spread.

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Math

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Grading Bell Curve Calculator

Rescale any raw exam score to a target mean using the linear z-score bell curve method, built for teachers and students.

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Projectile Motion Calculator

Find projectile range, max height, and flight time from launch velocity and angle. All three outputs shown with working. Assumes ground-level launch, no drag.

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Simpson's Rule Calculator

Estimate a definite integral using Simpson's 1/3 rule over 4 subintervals. You enter 5 function values at equally spaced points; this calculator does the rest.

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Trapezoidal Approximation Calculator

Estimate a definite integral using the trapezoidal rule with 4 subintervals. You supply 5 function values at equally spaced points; the formula does the rest.

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Polynomial Multiplication Calculator

Multiply two linear binomials (a₁x + a₀) and (b₁x + b₀) using the FOIL method. Enter four coefficients and read the quadratic result term by term.

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Boolean Expression Calculator

Evaluate AND, OR, NOT, XOR, NAND, and NOR expressions on boolean inputs A and B. Select the operator, enter true or false, and read the result instantly.

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Radical Equation Calculator

Solve √(ax + b) = c for x by squaring both sides. The calculator shows each step and checks whether the solution is valid or extraneous.

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Gauss-Jordan Calculator

Solve a 2×2 linear system using Gauss-Jordan elimination. Enter the coefficients of both equations and read the solution for x and y with steps shown.

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Fisher's Exact Test Calculator

Compute the exact probability of a 2×2 contingency table using Fisher's exact test. Enter counts a, b, c, d and get the hypergeometric p-value with steps.

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Geometric Distribution Calculator

Find P(X=k), P(X≤k), and the expected value for a geometric distribution. Enter the probability of success p and the trial number k to get all three results.

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Circumcenter Calculator

Find the circumcenter of a triangle from its three vertex coordinates. Enter the six coordinate values and read the circumcenter x and y with full working shown.

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Inverse Functions Calculator

Find the inverse of a linear function f(x) = mx + b. Enter slope m and y-intercept b to get the inverse function f⁻¹(x) with the swap-and-solve method shown.

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Fourier Series Calculator

Compute the Fourier series of a square wave: amplitude A, odd harmonics n = 1, 3, 5, .... Enter amplitude and harmonic count to get each bₙ coefficient listed.

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Grams to Troy Ounces Calculator

Convert between grams and troy ounces in either direction using the exact factor 1 troy oz = 31.1034768 g. Used for gold, silver, platinum, and other precious metals.

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Architectural Scale Calculator

Convert a scaled drawing measurement to its actual real-world size. Enter the drawing length and your scale ratio to find the true dimension in seconds.

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Vector Dot Product Calculator

Find the dot product of two three-dimensional vectors and the angle between them, with a step-by-step worked example showing every multiplication and sum.

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Inverse Normal CDF Calculator

Find the value at any given percentile of a normal distribution by entering the probability, mean, and standard deviation. Powered by the Acklam rational approximation.

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Sourdough Hydration Calculator

Find your sourdough dough's true total hydration percentage by entering the recipe flour, water, starter weight, and starter hydration, with the starter's own flour and water counted in full.

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Sourdough Starter Calculator

Find the exact gram weights of starter, flour, and water for any feeding ratio and target total weight, whether you use a 1:1:1, 1:2:2, or any other parts-based feed.

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Normal CDF Calculator

Find the chance below, above, or between values on a normal curve from its mean, spread, and one or two cutoffs for each result.

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Exponential Growth Calculator

Find how a quantity grows or shrinks with a discrete or continuous rate, using a start value, rate, and number of time periods.

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Two's Complement Calculator

Turn a signed whole number into two's complement binary, or read a fixed-width binary pattern as decimal, at 4, 8, 16, or 32 bits.

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Polynomial Long Division Calculator

Divide a polynomial from two coefficient lists, then see the quotient, remainder, and a direct check that recovers the dividend.

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Partial Fraction Decomposition Calculator

Split a proper rational function with distinct linear factors into simpler fractions, with coefficients found from the factor roots.

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Rational Expressions Calculator

Simplify a factored rational expression, cancel shared roots, and keep all values blocked by the first denominator for algebra work.

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Simplest Radical Form Calculator

Simplify square, cube, or fourth roots by pulling perfect powers from the radicand and showing each factor step for homework checks.

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Interval Notation Calculator

Turn one-sided or two-sided rules for x into interval notation with the right square mark, round mark, and infinity sign.

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Vertex Form Calculator

Convert a quadratic from standard form to vertex form, see each completing-the-square step, and read the vertex for graphing.

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Binomial Expansion Calculator

Expand (a + b)^n with the binomial theorem, list each coefficient and power, and compare the result with Pascal's triangle.

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Null Space Calculator

Find all vectors that a 2 by 2 matrix sends to zero, then see the row steps and the basis for the null space during introductory verification.

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Dilation Calculator

Scale a point from the origin or from a custom center, then see the new x and y values for any scale factor in geometry work.

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Poisson Distribution Calculator

Find the chance of an exact, at-most, or at-least event count from a mean rate and a whole-number target in statistics problems.

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Candle Wax Calculator

Estimate wax and scent oil weights for a round candle jar, with user-set values for wax type and scent load for hobby or small-batch work.

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Circle Skirt Calculator

Find the waist radius, hem radius, and least fabric width for a full circle skirt from waist, ease, and skirt length at home.

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Cross Stitch Calculator

Find the stitched design size and total fabric cut from the chart count, fabric count, and the margin added on every side.

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Sourdough Calculator

Find the water, starter, salt, and total dough weights for a sourdough batch from flour weight and baker's percentages for home baking.

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Running Record Calculator

Calculate running record accuracy and self-correction ratio from words, errors, and corrections, without assigning a reading level.

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Google Review Calculator

Estimate how many top-score reviews may raise a current score to a goal on Google or any fixed score scale, using clear best-case terms.

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Productivity Calculator

Calculate output per hour for a process, machine, or team, with a clear unit, time base, and neutral use of each result.

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Percentage of Goal Calculator

Find the percent of a goal reached so far by entering a current value and a target value in the same unit.

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Attendance Percentage Calculator

Find attendance rate from sessions attended and total sessions, for class records, work shifts, meetings, or training logs.

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Vote Percentage Calculator

Find the vote share for one option from votes received and total valid votes, for polls, contests, clubs, or surveys.

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Fraction Calculator

Add, subtract, multiply, or divide two fractions and see the reduced answer, decimal form, and working steps.

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Average Calculator

Find mean, median, and range from a list of numbers so students, teachers, and data readers can check center, middle, and spread.

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Percentage Calculator

Find a percent of a number, compare part to whole, or measure percent change with the formula, steps, and a worked example shown.

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Health & Fitness

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BMR Calculator

Estimate basal metabolic rate from age, sex, height, and weight, with metric or imperial inputs and a visible Mifflin-St Jeor example.

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TDEE Calculator

Estimate total daily energy expenditure from BMR and activity level, with metric or imperial inputs, formula steps, and a worked example.

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BMI Calculator

Calculate Body Mass Index from height and weight, and see your World Health Organization weight category.

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Finance

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1031 Exchange Calculator

Estimate the recognized gain and deferred tax in a 1031 exchange. Enter your adjusted basis, sale price, and received boot to calculate your position.

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Rent Vs Sell Calculator

Compare renting and selling your property using present-value math. Enter your projected rent income, sale proceeds, and holding costs to see which wins.

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1099 Vs W2 Calculator

Compare your net income as a 1099 contractor versus a W2 employee. Enter your gross income to see the self-employment tax impact on your actual take-home pay.

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Net Effective Rent Calculator

Find the true average monthly cost of a lease after spreading free-rent periods and concessions across the full lease term. Enter your lease details below.

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House Flipping Calculator

Estimate profit, ROI, and maximum offer price on a house flip. Enter your ARV, purchase price, rehab, and holding costs to run the numbers on your deal.

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CAC Calculator

Calculate your cost to acquire one new customer. Enter total sales and marketing costs and the number of new customers gained to find your CAC instantly.

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Reverse Sales Tax Calculator

Find the pre-tax price and sales tax from a tax-included receipt total using the rate from your sale.

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CD Interest Calculator

Estimate CD or share certificate interest, end value, and penalty impact from principal, APY, term months, and penalty days.

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Labor Percentage Calculator

Find what share of sales goes to labor cost or labour cost, using staff cost and total sales from the same period.

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Food Cost Percentage Calculator

Find the food cost percentage for a restaurant, menu group, or sales period from food cost and food sales.

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Ownership Percentage Calculator

Find raw ownership percentage from owned units and total units for shares, member units, co-op units, or partner units.

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Percentage Rent Increase Calculator

Find the percent change from old rent to new rent before you review a lease renewal or rent notice.

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BPS to Percentage Calculator

Convert basis points to percentage points, or convert percentage points back to basis points for rates and spreads.

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Year Over Year Percentage Calculator

Find year over year percent change for sales, cost, orders, traffic, or any metric with a prior and current value.

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Compound Interest Calculator

Project compound interest growth from a starting amount, rate, time, compounding frequency, and optional regular contributions.

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Loan Calculator

Check a fixed loan payment, total paid, and interest cost from the loan amount, rate, and term.

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Time & Date

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Half Birthday Calculator

Find the date six calendar months after a birth date, using the last valid day when February or another short month lacks the date.

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Anniversary Calculator

Find the next yearly anniversary, its year number, and the days left from a wedding, work, relationship, or contract date.

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Audiobook Speed Calculator

Find how long an audiobook, podcast, class, or video will take at a faster or slower rate, shown in hours, minutes, and seconds.

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Timecode Calculator

Add and convert HH:MM:SS:FF timecodes for film, TV, and video work, with frame-accurate results at standard editing rates.

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Time Off Calculator

Track a PTO or vacation total from carryover, hours earned per period, periods worked, and hours used, based on the rules you enter.

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Audiobook Percentage Calculator

Find audio progress from elapsed time and total time, using hours and minutes in the same time format.

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Age Calculator

Find exact age in years, months, and days from a birth date, with total days lived and a target date option for past or future checks.

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Date Duration Calculator

Find the time between two dates in years, months, days, total days, and weeks, with leap-year handling and a worked example.

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Sports

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Scuba Weight Calculator

Estimate the starting lead weight you need for your body weight, equipment, and wetsuit before heading underwater.

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Slugging Calculator

Calculate slugging percentage and OPS. Enter your singles, doubles, triples, home runs, and at-bats to quickly find these critical baseball stats.

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Decathlon Score Calculator

Calculate points for any decathlon event using official IAAF formulas. Enter your performance and the event-specific constants to find your score.

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Erg Pace Calculator

Instantly convert between rowing power output and split time. Enter your watts to find your 500m pace, or enter your pace to find your power output.

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Deer Scoring Calculator

Estimate the gross and net score of a typical whitetail deer rack. Enter your main beam, tine, and circumference measurements to calculate the score.

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Smolov Jr Calculator

Generate all 12 sessions of the Smolov Jr loading cycle. Enter your training max and a weekly increment to get exact sets, reps, and weights for each day.

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ERA Calculator

Find ERA from earned runs, full innings, and outs, while reading a 6.1 box-score line as 6 innings and 1 out, not a decimal.

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DOTS Calculator

Find a DOTS score from sex, body weight, units, and total, so lifters can compare scores across weight classes for meet checks.

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Win Rate Calculator

Calculate win rate from wins, losses, and ties, with a tie-adjusted option for sports, games, and season record tracking.

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Weight-to-Horsepower Ratio Calculator

Compare vehicle performance by lb per hp, hp per lb, and hp per 1,000 lb, with imperial and metric inputs supported for cars.

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Bowling Handicap Calculator

Find bowling handicap pins per game from avg, basis score, percent, round rule, games bowled, and an optional raw game score.

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Shooting Percentage Calculator

This shooting percentage calculator finds basketball shot success from makes and attempts, including FG% and field goal percentage.

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Hockey Goalie Save Percentage Calculator

This hockey goalie save percentage calculator finds SV% from saves and shots faced, using the decimal style seen in hockey box scores.

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Volleyball Hitting Percentage Calculator

This volleyball hitting percentage calculator finds attack efficiency from kills, errors, and total attacks, including negative results.

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Science

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Shelf Life Calculator

Estimate product shelf life at elevated test temperatures using the ASLT formula. Enter your reference days, temperatures, and z-value to get results.

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Boyle's Law Calculator

Solve for the unknown pressure or volume of an ideal gas at constant temperature. Enter three known variables into Boyle's Law to find the fourth.

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Superheat Calculator

Calculate your HVAC system superheat quickly. Enter the measured suction line temperature and the saturation temperature from a PT chart to find the value.

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Animal Gestation Calculator

Estimate a due date for sheep, dog, or pig pregnancy from the breeding date and the species average gestation length.

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Ideal Gas Calculator

Solve the ideal gas law for pressure, volume, moles, or temperature while the tool converts common chemistry and physics units.

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Water Potential Calculator

Find plant water potential from molarity, heat, particle factor, and pressure for biology, osmosis, and turgor problems.

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PPM Calculator

Find parts-per-million concentration from solute mass and either solution mass or volume, with separate modes for mg/kg and mg/L.

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VPD Calculator

Calculate air or leaf vapor pressure deficit from temperature and relative humidity for greenhouse and horticulture checks.

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Corn Yield Calculator

Estimate field corn yield in bushels per acre from a 1/1000-acre ear count, kernel rows, kernels per row, and kernel weight.

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Punnett Square Calculator

Build one-gene or two-gene Punnett squares from parent allele pairs and see the grid, genotype ratio, and phenotype ratio.

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Percentage by Weight Calculator

Find weight by weight percent from a part mass and total mass for chemistry class, lab notes, or weighed solution records.

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Percentage of Volume Calculator

Find v/v% from a part volume and final volume for liquid mixes, gas mixes, lab notes, and class problems.

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Dilution Calculator

Plan a lab mix, or an alcohol dilution, with C1V1 = C2V2 from stock strength, stock volume, target strength, and final volume.

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Construction

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Occupancy Load Calculator

Find the maximum permitted occupants for any room or space using the IBC occupant load factor formula in seconds.

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Gambrel Roof Calculator

Find ridge height and rafter lengths for a gambrel (barn-style) roof from building width and the lower and upper pitch angles.

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Egress Window Calculator

Check whether a basement or bedroom window opening meets IRC R310 minimum egress requirements for area, width, height, and sill height.

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Countertop Square Footage Calculator

Calculate the net countertop area you need to order, including cutouts and a waste allowance, for kitchens, bathrooms, or any surface project.

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Shower Tile Calculator

Find the total tile area needed for your shower walls, including a waste allowance for cuts, by entering the dimensions of up to three separate wall panels.

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Rip Rap Calculator

Estimate rip rap volume in cubic yards and order weight in tons by entering the area dimensions, stone density, and a waste percentage for your project.

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Polymeric Sand Calculator

Estimate the number of polymeric sand bags needed for your paver patio, walkway, or driveway by entering the area dimensions and the coverage per bag.

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Soffit Calculator

Estimate soffit material needed for your eave overhangs. Enter eave length, soffit width, and a waste factor to calculate total area and coverage.

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Wallpaper Calculator

Find out exactly how many rolls of wallpaper a room needs. Enter wall size, door and window openings, pattern repeat, and roll coverage to get your count.

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Log Board Foot Calculator

Estimate the lumber yield of a log in board feet using standard log scaling rules. Enter the small-end diameter and length to calculate under three log rules.

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Aggregate Calculator

Find the volume and weight of crushed concrete, crusher run, decomposed granite, #57 stone, limestone, or asphalt from length, width, depth, and waste.

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Joist Span Calculator

Find the maximum allowable span for deck or floor joists from species, nominal size, and on-center spacing using American Wood Council span tables.

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Paver Sand Calculator

Find the volume and weight of bedding sand needed for your paver installation by entering the paved area, bed depth, and sand density.

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Cinder Block Concrete Fill Calculator

Calculate the total volume of grout or concrete needed to fill the open cores of a given number of cinder blocks, in cubic feet and cubic yards.

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Plywood Weight Calculator

Find the weight of a plywood sheet or stack by entering the sheet area, thickness, and the density of the wood species or panel grade you are working with.

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Horizontal Tank Volume Calculator

Find the volume of liquid in a horizontal cylindrical tank at any fill depth using circular-segment geometry, with results in cubic feet and gallons.

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Concrete for Stairs Calculator

Estimate the concrete volume needed for a staircase by entering the stair width, total run, and total rise, with an optional landing slab added separately.

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Rubber Mulch Calculator

Find how many bags of rubber mulch or bales of pine straw a bed needs from length, width, depth, and product coverage rate.

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Bitumen Calculator

Find asphalt or blacktop weight for a paving job from the area, packed depth, and mix weight per cubic foot, with values you can change.

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Topsoil Calculator

Find how much topsoil, fill dirt, or loam a lawn or garden bed needs from its area and depth, shown in cubic feet and cubic yards.

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Sand Calculator

Find the sand volume and weight for a bed, trench, or fill job from its length, width, depth, bulk weight, and waste rate.

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River Rock Calculator

Find the rock volume and weight for a bed, path, or drain from its length, width, depth, bulk weight, and waste rate for job plans.

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Cinder Block Calculator

Find how many cinder, CMU, or cement blocks a wall needs from its length, height, block face size, and total door or window area.

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Plywood Calculator

Estimate the full plywood sheets needed for a wall, floor, roof, or panel project from coverage area, sheet size, and an adjustable waste rate.

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Linear Feet Calculator

Convert a known area in square feet into the linear footage needed for material with a fixed, uniform width measured in feet.

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Epoxy Calculator

Find the epoxy resin needed in US gallons from coated area, wet layer depth, and extra material for mixing and placement loss.

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Paver Base Calculator

Find the finished paver base volume and the larger loose stone order from area, target depth, and a clearly stated fixed 1.25 factor.

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Tank Volume Calculator

Find full tank size in US gallons for a box tank or upright round tank from the chosen shape and inside lengths in feet.

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Rafter Calculator

Find a common rafter's sloped length from roof run, pitch, and an optional eave for an early check of simple roof framing.

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Recessed Lighting Calculator

Find rows, columns, and the total light count from room size and the center-to-center spacing you choose for a simple grid.

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Roof Square Footage Calculator

Find sloped roof surface area from a flat roof plan area and pitch for an early check of roof size and material needs before takeoff.

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Stairs Calculator

Find stair risers, true riser height, total run, and straight stringer line from floor rise and a chosen tread size for planning.

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Stud Calculator

Find the basic stud count for a straight wall from wall length and the on-center gap set by the framing plan before openings.

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Metal Roof Calculator

Estimate full metal roof panels from roof area, installed panel coverage dimensions, and a chosen waste allowance for cuts and layout.

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Gutter Slope Calculator

Calculate total gutter drop from run length and a slope rate you choose, without recommending drainage pitch, gutter size, or outlet design.

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Wainscoting Calculator

Estimate full wainscoting panels around a room from combined wall perimeter, excluded opening widths, and installed panel width.

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Deck Stain Calculator

Estimate deck stain gallons from measured area, the selected product label coverage, coat count, and a chosen waste allowance.

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Pond Size Calculator

Estimate pond surface area and US gallons from shape dimensions and average depth for rectangular, circular, or oval layouts.

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Aquarium Substrate Calculator

Estimate aquarium substrate volume and weight from tank base dimensions, chosen substrate depth, and a user-entered weight per cubic foot.

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Firewood Calculator

Measure a stacked firewood pile in cubic feet, full cords, and cubic metres while keeping full-cord and face-cord quantities distinct.

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Log Weight Calculator

Estimate log weight from diameter, length, and a user-entered wood weight per cubic foot, with clear limits for taper and moisture.

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Glass Weight Calculator

Estimate the weight of a rectangular glass pane from its length, width, mm thickness, and an adjustable lb/sq ft/mm factor.

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Engineering

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