What is the BMR Calculator?
The bmr calculator is a free online tool that helps you work out bmr quickly and accurately. It uses the standard formula Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female) and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Choose your gender.
- Enter age, weight and height.
- See your basal metabolic rate.
Formula used
Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female)Explanation of each input
- Gender โ the gender used in the calculation.
- Age (years) โ the age used in the calculation.
- Weight (kg) โ the weight used in the calculation.
- Height (cm) โ the height used in the calculation.
Understanding your result
- BMR โ the calculated bmr in kcal/day.
Step-by-step calculation
For the example values Male, 30y, 70kg, 170cm:
- Apply the formula:
Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female) - Substitute the values: 10x70 + 6.25x170 - 5x30 + 5
- Result: BMR about 1617 kcal/day
Worked example
| Inputs | Male, 30y, 70kg, 170cm |
|---|---|
| Working | 10x70 + 6.25x170 - 5x30 + 5 |
| Result | BMR about 1617 kcal/day |
Benefits and practical uses
This calculator saves you time and reduces errors when you need bmr. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Mifflin-St Jeor equation.
- Healthy adults.
Frequently asked questions
What is BMR?
Basal Metabolic Rate is the energy your body burns at complete rest to keep vital functions running.
How do I get daily calorie needs?
Multiply BMR by an activity factor (1.2 sedentary to 1.9 very active) to get TDEE.