BMR Calculator (Basal Metabolic Rate)
Calories your body burns at complete rest, using the Mifflin–St Jeor and Harris–Benedict equations.
Result
How to use
- 1
Choose your sex and set your age, height and weight.
- 2
See your BMR from two well-known equations.
- 3
Scroll down to see daily calories for each activity level.
Questions
What is BMR?
Basal Metabolic Rate is the energy (in kcal) your body needs at complete rest just to keep you alive — breathing, circulation, body temperature and cell repair. It is usually 60–70% of the calories you burn in a day.
Which formula is more accurate?
Studies find Mifflin–St Jeor (1990) is the most reliable for most adults, so it is shown as the main result. The revised Harris–Benedict equation (Roza & Shizgal, 1984) usually comes out a little higher.
How do I get my daily calorie need?
Multiply BMR by an activity factor — 1.2 for a desk job up to 1.9 for very physical work. The table below the result does this for you.
About this BMR tool
BMR Calculator (Basal Metabolic Rate) — Calories your body burns at complete rest, using the Mifflin–St Jeor and Harris–Benedict equations. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Choose your sex and set your age, height and weight.
Related reading
Articles that go with this tool
Hidden Sugar on Your Plate: How to Read a Food Label in Two Minutes
Sugar hides in biscuits, sauces, "healthy" drinks and even bread. Here is a simple two-minute way to read the label and catch it.
Heart Rate Zones Made Simple: Walk, Run and Train Smarter — Not Harder
Why some days you should exercise slower to get fitter. A simple guide to heart rate zones, how to find yours, and how to use them for walking, running and weight loss.
The 30-Minute Walk: The Simplest Habit That Changes Everything
No gym, no equipment, no fees. Why a daily 30-minute walk is the easiest health habit to start — and how to make it stick.
Related tools
More health tools you may like
Results are estimates to help you plan. They are not financial, tax or medical advice.