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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.

By The Calcumatix Team Reviewed by Calcumatix Editorial Review

Units

Estimated TDEE

2,556 cal/day

BMR: 1,649|Factor: 1.55

Estimate only, not medical or nutritional advice. Individual needs vary.

Quick Answer

TDEE is the calories you burn in a full day, found by multiplying your BMR by an activity factor. So a 30-year-old man at 70 kg, 175 cm, and moderately active has a BMR near 1,649 and a TDEE of about 2,556 calories per day. Pick the activity level that matches a typical week, not your hardest training day.

TDEE Calculator: What It Measures And Why

The TDEE Calculator estimates total daily energy expenditure, the calories your body may use in a full day. It first calculates BMR with the Mifflin-St Jeor equation, then multiplies that resting number by the activity factor you choose. The result is higher than BMR because it adds a planning allowance for movement and exercise. For a 30-year-old male at 70 kg and 175 cm, BMR is 1,648.75 calories. With a moderate activity factor of 1.55, TDEE is 1,648.75 x 1.55 = 2,555.5625, rounded to 2,556 calories per day. Use TDEE as a starting estimate for maintenance calories, weight planning, or comparing activity levels. The result is not a lab measurement, and real energy needs can change with body composition, work, training, health, sleep, food intake, and food tracking over time.

How The TDEE Calculator Formula Is Calculated

TDEE = BMR x activity factor. BMR uses the Mifflin-St Jeor equation. The calculator then applies the selected activity factor: sedentary 1.2, light 1.375, moderate 1.55, active 1.725, or extra active 1.9.

  • BMR: resting calories estimated from age, sex, height, and weight.
  • Activity factor: the multiplier selected from your typical activity level.
  • TDEE: BMR x activity factor.
  • Activity add-on: TDEE - BMR.
  • Displayed result: calories per day, rounded to the nearest whole calorie.

Mifflin-St Jeor is a published predictive equation for resting energy expenditure. The activity factor is a planning multiplier, not a direct measurement of physical activity.

NCBI notes that physical activity is a variable part of total energy expenditure. This is why the same BMR can produce different TDEE estimates at different activity levels.

TDEE Calculator Steps: Enter, Calculate, Check

Inputs

  • Units: choose metric for kg and cm, or imperial for lb and inches.
  • Sex: choose the equation constant used for the BMR step.
  • Age: enter age in full years.
  • Weight: enter current body weight in the selected unit.
  • Height: enter current height in the selected unit.
  • Activity level: choose the option that best matches a typical week.

Steps

  1. Choose metric or imperial units.
  2. Select the sex used by the BMR formula.
  3. Enter age, weight, and height.
  4. Choose the activity level that fits a typical week.
  5. Read BMR, activity factor, and estimated TDEE.

See The TDEE Calculator Applied To Real Numbers

Estimate TDEE for a 30-year-old male who is 70 kg, 175 cm, and moderately active.

  1. Use the BMR formula first: 10 x 70 + 6.25 x 175 - 5 x 30 + 5.
  2. BMR calculation: 700 + 1,093.75 - 150 + 5 = 1,648.75 calories.
  3. Moderately active factor: 1.55.
  4. TDEE formula: TDEE = BMR x activity factor.
  5. Substitute the values: TDEE = 1,648.75 x 1.55.
  6. Multiply: 1,648.75 x 1.55 = 2,555.5625.
  7. Rounding: 2,555.5625 rounds to 2,556 calories per day.

The estimated TDEE is 2,556 calories per day.

Is A TDEE Calculator Right For You?

Use a TDEE calculator when you need a starting estimate for daily maintenance calories. The number can help compare activity levels, plan food tracking, or discuss calorie targets with a qualified professional.

TDEE is more practical than BMR when activity matters. BMR estimates resting calories, while TDEE adds a planning allowance for movement and exercise.

For nearby tools, use the BMR calculator to see the resting baseline, the BMI calculator for a weight-to-height screening number, or the health calculators hub for related tools.

Assumptions

  • BMR is calculated with the Mifflin-St Jeor equation.
  • Activity level is selected as a broad weekly category.
  • The same activity factor applies to every day in the estimate.
  • Metric inputs use kilograms and centimeters.
  • Imperial inputs convert to metric before calculation.
  • Results are rounded to the nearest whole calorie.

The result is a planning estimate. It is not a prescription, lab measurement, or personalized nutrition plan.

Limitations

  • The calculator does not measure calorie burn with lab equipment.
  • Activity categories can overstate or understate real daily movement.
  • The calculator does not account for body composition or medication effects.
  • The calculator is not designed for children, pregnancy, or clinical nutrition decisions.
  • Food tracking and body weight trends may show a different maintenance level over time.

In Practice

The most common mistake is over-rating your activity level, which inflates TDEE and stalls a goal. Most people sit closer to lightly active than to very active once desk hours are counted. If weight is not moving as expected, drop one activity band rather than trusting the higher multiplier, then re-check after a couple of weeks.

Related Calculators

BMR Calculator

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

Open the Calculator

BMI Calculator

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

Open the Calculator

Frequently Asked Questions About TDEE Calculator Math

What does a TDEE calculator estimate?

A TDEE calculator estimates total daily calories from resting energy and activity level. The result is often used as a starting maintenance-calorie estimate.

How is TDEE calculated from BMR?

TDEE is calculated by multiplying BMR by an activity factor. This calculator uses Mifflin-St Jeor for BMR, then applies the activity level you choose.

Which activity level should I choose?

Choose the activity level that best matches your typical week, not your best week. If two options seem close, the lower one is often the more cautious estimate.

Is TDEE the same as BMR?

TDEE is not the same as BMR because TDEE includes activity. BMR is the resting baseline, while TDEE multiplies that baseline by an activity factor.

How accurate is a TDEE calculator?

A TDEE calculator gives an estimate, not a measured daily calorie burn. Activity categories, body composition, health status, and tracking error can all change real needs.

Can I use TDEE for weight goals?

TDEE can support weight planning, but it should not be used alone. Compare the estimate with food tracking, weight trends, and guidance from a qualified professional when needed.

Sources

Reviewed for accuracy against the formula shown above.