BMR Calculator
Estimate basal metabolic rate (BMR) with the Mifflin–St Jeor equation and see rough daily calorie multipliers.
BMR Calculator
Free online tool · instant results
BMR Calculator workspace
Results
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Enter values and calculate to see results.
What it does
Estimate basal metabolic rate (BMR) with the Mifflin–St Jeor equation and see rough daily...
Best for
Estimate basal metabolic rate (BMR) with the Mifflin–St Jeor equation an...
Time
~1 min to complete
Pricing
Free forever
Access
No signup required
Privacy
Runs in your browser
Overview
About this tool
A clear look at what this tool is for and why people use it.
BMR Calculator
Estimate basal metabolic rate (BMR) with the Mifflin–St Jeor equation and see rough daily calorie multipliers.
Why use it
Benefits
Everything you need for a fast, confident answer — nothing you don’t.
Free to use
no signup for core calculations
Mobile-friendly workspace on a dedicated p
Mobile-friendly workspace on a dedicated page
Clear formulas and worked examples
Clear formulas and worked examples
Private
inputs are not saved by this tool
Walkthrough
How to use
Simple steps from empty form to a result you can use.
-
1
Enter your values in the workspace form.
-
2
Select Calculate to run the formula.
-
3
Review results; copy when available.
-
4
Reset clears inputs for another run.
Worked samples
Examples
Real-world scenarios so you can match the math to your situation.
Example
- 178 cm
- BMR near mid-1700s kcal/day depending on exact math rounding.
Under the hood
How it works
Follow the path from input to output — transparent and easy to scan.
Input
Mifflin–St Jeor:
Male: BMR
10×kg + 6.25×cm − 5×age + 5
Female: BMR
10×kg + 6.25×cm − 5×age − 161
Imperial inputs convert to
Imperial inputs convert to kg and cm first. Multipliers (1.2–1.9) approximate activity levels.
Math reference
Formula
Copy the formula or inspect each variable below.
Formula
Beautiful math, ready to reuse
BMR_male = 10w + 6.25h − 5a + 5
BMR_female = 10w + 6.25h − 5a − 161
(w = kg, h = cm, a = age years)Variables
Pro tips
Tips
Small habits that make this tool even more useful day to day.
Get accurate results
Double-check units and inputs before you rely on BMR Calculator output for anything important.
Work faster
Use the examples below as a starting point, then tweak values to match your scenario.
On any device
This tool is mobile-friendly — bookmark the page so you can reopen it in one tap.
Watch out
Common mistakes
Avoid these slip-ups so your result is ready the first time.
Leaving required fields blank
Enter every value the workspace asks for before calculating — empty fields usually block a result.
Using invalid numbers
Avoid negative values or percentages outside a valid range unless the tool explicitly allows them.
Mixing up units
Keep units consistent (currency, length, weight, time) so the formula returns a meaningful answer.
FAQ
Frequently asked questions
Straight answers to the questions people ask most.
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