Mifflin-St Jeor TDEE Calculator
Most calculators hand you a number. This one shows the Mifflin-St Jeor equation, substitutes your values, and walks every step so you can check the math yourself.
Step 1 - Basal metabolic rate
The equation
BMR = 10 x 70 + 6.25 x 175 - 5 x 30 + 5Your values substituted
BMR = 700 + 1093.8 - 150 + 5 = 1649 kcal/dayStep 2 - Multiply by activity
TDEE = 1649 x 1.55 = 2556 kcal/dayYour TDEE
2556 kcal per day
How the Mifflin-St Jeor equation works
Basal metabolic rate (BMR)
BMR is what your body burns at complete rest. Mifflin-St Jeor was published in 1990 and is generally considered the most accurate predictive equation for the general population.
Men: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5Women: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161
Total daily energy expenditure (TDEE)
TDEE is BMR multiplied by an activity factor. The factor accounts for everything you do on top of lying still: moving, digesting, and training.
TDEE = BMR x activity factorCommon questions
- Is Mifflin-St Jeor more accurate than Harris-Benedict?
- For most people, yes. Mifflin-St Jeor was derived from a more recent population and typically predicts resting energy expenditure with less error than the older Harris-Benedict equation.
- Why does the result differ from other calculators?
- Usually the activity factor. Some calculators round it, bundle exercise differently, or apply body-fat adjustments. Every number used here is shown above, so you can compare step by step.
- Should I eat exactly my TDEE?
- TDEE is an estimate of maintenance. Predictive equations carry real error for any individual, so treat the number as a starting point and adjust from your own weight trend over two to three weeks.