Health calculator
BMR Calculator
Estimate basal metabolic rate and daily calories burned at rest.
Quick answer
How do you calculate BMR?
Use the Mifflin–St Jeor equation: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5 for men, or − 161 for women. A 30-year-old man at 80 kg and 180 cm has a BMR of about 1,780 calories a day.
Mifflin-St Jeor — Men: 10w + 6.25h − 5a + 5 • Women: 10w + 6.25h − 5a − 161
⚡ Answer updates as you type · Enter = calculate · Esc = reset
The BMR Calculator estimates basal metabolic rate, or calories your body may burn at rest each day.
About this BMR Calculator
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep organs functioning. Knowing your BMR is the starting point for any calorie or weight plan.
What you'll need
- • Age
- • Sex
- • Height
- • Weight
How it works
- 1. Enter your age, sex, height, and weight.
- 2. The calculator applies the Mifflin-St Jeor equation.
- 3. Use the result as the base for daily calorie targets.
Worked example
A 35-year-old man, 180 cm, 80 kg, has a BMR of about 1,780 calories per day.
Related searches
BMR Calculator FAQ
What is the BMR Calculator?
The BMR Calculator is a free online tool that helps you estimate basal metabolic rate and daily calories burned at rest.
How do I use the BMR Calculator?
Open the BMR Calculator, enter the requested values, and review the instant estimate on the page.
Is the BMR Calculator free?
Yes. The BMR Calculator is free to use on Fast Online Calculator and does not require an account.
Is BMR the same as TDEE?
No. BMR is calories at rest. TDEE adds calories burned through daily activity and exercise.
Can I lose weight by eating below BMR?
Eating below BMR for long periods is not recommended. Aim for a moderate deficit below your TDEE instead.
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