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Enter age, height, weight, and sex. We compute BMR and show TDEE across activity levels (segments are proportional to multipliers). Formulas: Mifflin–St Jeor (default) and Revised Harris–Benedict.
BMR = 10×W + 6.25×H − 5×A + 5 |
Women: BMR = 10×W + 6.25×H − 5×A − 161
BMR = 13.397×W + 4.799×H − 5.677×A + 88.362 |
Women: BMR = 9.247×W + 3.098×H − 4.330×A + 447.593
BMR (Basal Metabolic Rate) is the number of calories your body needs to keep basic life-sustaining functions running while at complete rest — think breathing, circulation, cell production, and maintaining body temperature. It’s an estimate of the energy your body uses before you add any activity or exercise.
Understanding your Basal Metabolic Rate is an important step toward managing weight and nutrition. While BMR doesn’t account for calories burned by movement or digestion, it’s the foundation for calculating your total daily calorie needs and planning a healthy eating or weight plan.
At CalculateKaro.com, our Free Online BMR Calculator is designed to give you accurate results instantly. Just enter your weight and height, and the calculator will do the rest. No downloads, no sign-ups—completely free and easy to use.
Baseline for calories: BMR tells you the minimum calories your body needs each day.
Weight planning: Combine BMR with your activity level to estimate calories for maintenance, weight loss, or gain.
Personalization: Age, sex, weight, and height strongly influence BMR — so it’s more individualized than one-size-fits-all rules.
Health insight: Large deviations from expected BMR (very low or very high) can be a cue to check health or medication effects with a professional.
There are standard formulas used to estimate BMR; two common ones are:
Harris–Benedict (older formula, still used sometimes): uses a different set of coefficients but the idea is the same — weight, height, age, and sex produce an estimated daily calorie need at rest.
Remember: these are estimates, not exact measures. Factors like lean muscle mass, genetics, hormones, and health conditions also affect your real BMR.
To estimate how many calories you actually burn each day, multiply your BMR by an activity factor to get your Total Daily Energy Expenditure (TDEE). Common activity multipliers range from ~1.2 (sedentary) to ~1.9 (very active). That TDEE is what you’d use to plan weight loss (calorie deficit), maintenance, or weight gain (calorie surplus).
At CalculateKaro.com, our Free Online BMR Calculator gives you an instant, easy estimate of your basal calorie needs. Just enter:
Age
Sex
Weight (kg)
Height (cm)
No downloads, no sign-ups — completely free. If you want an estimate of daily calories for maintenance or weight change, use the optional activity-level setting to convert BMR → TDEE.
