Calorie Calculator
Estimate daily maintenance calories, basal metabolic rate and simple reference intake ranges from age, sex, height, weight and activity level.
Calorie calculator
Estimate daily maintenance calories from age, sex, height, weight and activity level.
Estimated BMR
kcal/day at rest
Maintenance estimate
kcal/day
Moderate reduction
about 10% below maintenance
Moderate increase
about 10% above maintenance
How the calorie estimate works
This calculator estimates basal metabolic rate using the Mifflin–St Jeor equation and then applies an activity factor to estimate daily energy needs.
Your actual calorie needs can differ because of body composition, health conditions, medications, pregnancy, training load and other individual factors.
The values shown for a moderate reduction or increase are simple reference points based on about 10% below or above the maintenance estimate. They are not individualized weight-management recommendations.
Important
This calculator is for general informational use by adults. It is not intended for children, pregnancy, eating-disorder treatment, or medical nutrition therapy. If you have a medical condition or need an individualized calorie target, use guidance from a qualified healthcare or nutrition professional.
How to use it
Enter your age, sex, height, weight and activity level. The calculator estimates basal metabolic rate using the Mifflin–St Jeor equation, then applies an activity factor to estimate maintenance calories.
Privacy
Calculations are performed in your browser. The values you enter are not submitted to Muft.
Tool behavior last checked Aug 15, 2026.