BMI Calculator
BMI Calculator is a free online calculator that helps you compute Body Mass Index from height and weight in either metric or imperial units. BMI Calculator uses 3 input fields, returns 4 output values, and runs in your browser on the device.
Key facts
- Inputs
- 3 fields: Units, Height, and Weight
- Outputs
- 4 values: BMI, Category, Height (m), and Weight (kg)
- Runtime
- your browser on the device
- Mode
- Calculator
- Privacy
- Files and text stay in the browser session.
- Cost
- $0, no account required
How to use BMI Calculator
- 1
Paste or fill in the input
Enter your text or values into the input fields on the page.
- 2
Run the utility
Click Compute to run the utility in your browser and review the result.
- 3
Copy the output
Copy the output value you need from the result panel.
BMI Calculator details
First, enter Units in BMI Calculator. Next, review BMI, Category, Height (m), and Weight (kg). Additionally, BMI Calculator uses 3 input fields and 4 output blocks so the result is easy to scan and copy.
BMI is computed as weight (kg) ÷ height (m)². BMI Calculator accepts metric (cm + kg) or imperial (ft + in + lb) inputs and reports the WHO category (underweight, normal, overweight, obese class I/II/III). Runs locally in your browser; your data is never sent anywhere.
Common searches
- bmi calculator
- body mass index calculator
- calculate bmi
- bmi formula
- metric bmi calculator
- imperial bmi calculator
Related tools
Tools that work with the same formats — most users open one of these next.
Weight Converter
Convert between metric and imperial weight units — mg, g, kg, tonnes, ounces, pounds, stone, US tons.
Percentage Calculator
Compute percent of a number, the percentage one number is of another, and percentage change.
Age Calculator
Compute your age in years, months, and days from a date of birth — plus total days lived.
Length Converter
Convert between metric and imperial length units — mm, cm, m, km, inches, feet, yards, miles.
Date Difference Calculator
Compute the difference between two dates in years, months, days, hours, minutes, seconds.
Aspect Ratio Calculator
Compute aspect ratios and resize dimensions while preserving the original proportion — 16:9, 4:3, 21:9 and more.
Frequently asked
What is BMI Calculator?
BMI Calculator is a free online calculator that helps you compute Body Mass Index from height and weight in either metric or imperial units. BMI Calculator uses 3 input fields, returns 4 output values, and runs in your browser on the device.
What inputs and outputs does BMI Calculator use?
BMI Calculator uses 3 input fields: Units, Height, and Weight. BMI Calculator returns 4 output values: BMI, Category, Height (m), and Weight (kg).
Do my files and data stay private?
Yes. BMI Calculator runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How do I use BMI Calculator?
Open BMI Calculator, paste or fill in the input fields, and the result updates instantly. BMI Calculator runs in your browser with no upload and no waiting.
Which browsers does BMI Calculator support?
Any modern browser works in Chrome, Firefox, Safari, and Edge on desktop and mobile. BMI Calculator uses standard web APIs and does not require any plugin, extension, or sign-up.