BMI Calculator
Calculate body mass index (BMI) from height and weight in metric or imperial units, with WHO category.
BMI Calculator
Free online tool · instant results
BMI Calculator workspace
Results
No results yet
Enter height and weight, then calculate BMI.
What it does
Calculate body mass index (BMI) from height and weight in metric or imperial units, with W...
Best for
Calculate body mass index (BMI) from height and weight in metric or impe...
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.
BMI Calculator
Calculate body mass index (BMI) from height and weight in metric or imperial units, with WHO category.
BMI does not measure body fat directly and is not medical advice — use it as a simple screening number only.
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.
Metric
- 70 kg and 175 cm
- BMI ≈ 22.9 (normal range).
Imperial
- 154 lb and 5 ft 9 in
- similar mid-normal BMI.
Under the hood
How it works
Follow the path from input to output — transparent and easy to scan.
Metric: BMI
weight_kg ÷ (height_m)² where height_m = cm ÷ 100.
Imperial inputs are converted
Imperial inputs are converted to kg and meters using standard factors, then the same formula runs.
Result
Categories use WHO adult cutoffs (18.5, 25, 30).
Math reference
Formula
Copy the formula or inspect each variable below.
Formula
Beautiful math, ready to reuse
BMI = kg / m²
m = cm / 100
(imperial) kg = lb × 0.45359237; m = inches × 0.0254Variables
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 BMI 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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