Resting energy
Estimate calories used for essential body functions before activity.
Basal metabolic rate estimate
Free BMR Calculator
A BMR calculator estimates how many calories your body uses at rest each day. Enter your age, sex, height, and weight to get a Mifflin-St Jeor estimate and activity-adjusted daily ranges.
Resting energy estimator
Calculate your BMR
Enter adult body stats to estimate resting calorie use with the Mifflin-St Jeor equation.
Estimated basal metabolic rate
1,528calories/day
This estimates the energy your body uses at rest for breathing, circulation, temperature regulation, and other basic functions.
Daily needs at moderately active
2,368 calories/day
A practical starting range is 2,179-2,557 calories per day. Actual needs vary with body composition, health, sleep, and movement.
Activity levelCalories/day
Sedentary1,834
Lightly active2,101
Moderately active2,368
Active2,636
Very active2,903
Educational estimate for adults only. It is not medical advice and should not replace guidance from a qualified clinician or dietitian.
Two unit systems
Use familiar imperial measurements or enter metric height and weight.
Activity context
Compare BMR with five activity-adjusted daily calorie estimates.
BMR calculator FAQ
What is a BMR calculator?
A BMR calculator estimates the calories your body uses each day at complete rest to support breathing, circulation, temperature regulation, and other basic functions.
How is BMR calculated?
This calculator uses the Mifflin-St Jeor equation, which estimates BMR from age, sex, height, and weight. The result is an estimate, not a direct measurement.
Is BMR the same as daily calorie needs?
No. BMR covers resting energy only. Estimated daily calorie needs multiply BMR by an activity factor to account for movement, exercise, and normal daily tasks.
Can I use BMR for weight planning?
BMR can be a starting point, but daily needs are more useful for planning. Track real trends over time and consult a qualified professional for individualized guidance.
Who should not rely on this BMR estimate?
Children, teens, pregnant or breastfeeding people, competitive athletes, and people with medical conditions should use advice from a qualified clinician or dietitian.
Related free tools
Make family planning feel lighter
FamilyGPT helps households organize everyday decisions, routines, and plans together.
Explore FamilyGPT