This BMR calculator estimates resting energy expenditure with the Mifflin-St Jeor equation. An activity factor gives a rough estimate of total daily expenditure.
Enter age (18 or older), sex, height, weight and activity
In older age, muscle mass and general condition matter when interpreting BMI. Winter et al. (2014) describe limitations of the usual BMI interpretation in older adults. Winter et al., 2014. BMI by age
Adult reference ranges
Below the reference rangeunder 18.5Current range
Within the reference range18.5 to 24.9Current range
Above the reference range25 to 29.9Current range
Well above the reference range30 or moreCurrent range
This calculator gives general reference values and does not replace advice from a doctor. For children and teens under 18, during pregnancy and breastfeeding, for very muscular builds and in older age, the results are of limited use.
How it is worked out
BMR is estimated with the Mifflin-St Jeor equation: 10 × weight in kg + 6.25 × height in cm, minus 5 × age, then plus 5 for men or minus 161 for women.
TDEE multiplies your BMR by an activity factor, from 1.2 (little movement) to 1.9 (very active).
Limits of the estimate
Formulas describe averages. Your real needs can differ, for example with muscle mass, sleep or daily routine. Watch your trend for a few weeks and adjust the starting point.
If you want to change how you eat in a big way, talk to your doctor.
Activity factors as model assumptions
The factors 1.2, 1.375, 1.55, 1.725 and 1.9 are this calculator's selectable assumptions for increasing activity. They are not a personal expenditure assessment validated by the Mifflin study. The equation estimates resting energy expenditure; BMR is used here as the familiar search term.
This calculator gives general reference values and does not replace advice from a doctor. For children and teens under 18, during pregnancy and breastfeeding, for very muscular builds and in older age, the results are of limited use.