Health & Fitness calculator
BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation.
About the bmr calculator
The BMR calculator finds your Basal Metabolic Rate — the calories your body burns at complete rest.
How to use this calculator
- 1
Enter body details
Enter weight, height, age, and gender.
- 2
View results
See your BMR in calories per day.
How the calculation works
Male: 10×weight + 6.25×height − 5×age + 5. Female: 10×weight + 6.25×height − 5×age − 161. This is calories burned at complete rest.
Example: 70 kg, 175 cm, 30yo male: BMR ≈ 1,644 cal/day.
Important health disclaimers
These calculators provide estimates based on population averages. Individual results vary based on genetics, body composition, medical conditions, and medications. Always consult a healthcare provider before starting a new diet or exercise program, especially if you have underlying health conditions.
Understanding body composition metrics
BMI doesn't distinguish muscle from fat. Body fat % is more accurate but depends on measurement technique. TDEE varies day-to-day based on activity. Macro targets are starting points — adjust based on your results, energy levels, and goals. Hydration needs increase with exercise, heat, and altitude.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about bmr calculator
How accurate is the BMR calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.