How to use the BMI Calculator
- Choose metric or imperial units
- Enter your height and weight
- See your BMI and category
About this tool
Calculate your Body Mass Index in metric or imperial units and see your weight category and healthy weight range. BMI Calculator is part of ToolNest's collection of free health & fitness. It works instantly in your browser with no account and no installation.
Frequently asked questions
Is the BMI Calculator free to use?
Yes. BMI Calculator on ToolNest is completely free, with no sign-up, no watermark and no daily limits.
How accurate is the BMI Calculator?
BMI Calculator uses standard, widely accepted formulas and calculates instantly as you type. Results are for general information — for important medical decisions, please confirm with a qualified professional or your institution.
Is my data saved anywhere?
No. Everything you enter stays in your browser. Nothing is sent to or stored on our servers.
Does BMI Calculator work on mobile phones?
Yes. ToolNest works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux. There is nothing to install.