What is the BMR Calculator?
Estimate basal metabolic rate — calories your body burns at complete rest — with the Mifflin-St Jeor equation. Our health and fitness calculators use validated, published equations — such as Mifflin-St Jeor for metabolic rate and the U.S. Navy method for body fat — to give you a solid starting point for training and nutrition.
How to use the BMR Calculator
- Enter your sex, your age, your weight, your height.
- Results update automatically as you type; you can also press Calculate.
- Read the output: bmr, harris-benedict (revised).
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With sex = Male, age = 35 years, weight = 75 kg, height = 178 cm, the BMR Calculator returns bmr: 1,693 kcal/day; harris-benedict (revised): 1,749 kcal/day.
Tips for better results
- Equations estimate population averages; your individual numbers may differ.
- Track trends over weeks rather than reacting to a single reading.
- Pair calculators with professional guidance for medical conditions, pregnancy or major diet changes.
⚠️ This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Frequently asked questions
What does the BMR Calculator do?
Estimate basal metabolic rate — calories your body burns at complete rest — with the Mifflin-St Jeor equation.
How is it calculated?
The BMR Calculator uses this method: Men: 10W + 6.25H − 5A + 5; Women: 10W + 6.25H − 5A − 161.
Can you show an example?
With sex = Male, age = 35 years, weight = 75 kg, height = 178 cm, the BMR Calculator returns bmr: 1,693 kcal/day; harris-benedict (revised): 1,749 kcal/day.
Is the BMR Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Is this tool free and private?
Yes — the BMR Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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