Metric or imperial
Use kilograms and centimetres, or pounds and feet and inches.
⚖️
BMI Calculator
Calculate your body mass index in metric or imperial units.
🔒 Enterprise privacy — 100% client-side, no server uploads
Enter your weight and height to see your BMI.
BMI is a general screening number for adults aged 20 and over. It does not measure body fat, muscle or health, and is not medical advice. Talk to a doctor about your own situation.
What is BMI Calculator?
BMI Calculator is a free online tool that lets you calculate your body mass index in metric or imperial units. It works in your web browser with no signup. Enter your text or numbers and see the result instantly. Everything you type stays in your browser.
Also searched as: body mass index calculator, calculate BMI, BMI metric and imperial, BMI checker.
BMI Calculator at a glance
- Price
- Free, with no paid plans
- Account
- No signup or login needed
- Where it runs
- In your web browser
- Your data
- Nothing you type is sent to a server
- Works on
- Any modern browser, on desktop and mobile
- Category
- Developer & Everyday Calculators
When to use BMI Calculator
- →Work out BMI from height and weight
- →Use metric or imperial units
- →Get a quick general reference number
How to use BMI Calculator
- 1
Open BMI Calculator and fill in the values it asks for.
- 2
The result appears and updates instantly as you change any field.
- 3
Copy the result if you need to paste it elsewhere.
Why use BMI Calculator
- ✓Runs entirely in your browser — your file is never uploaded to a server.
- ✓No account, signup, or email address required to use it.
- ✓Completely free, with no daily limit and no signup.
- ✓Gives an instant, accurate result without opening a spreadsheet.
BMI Calculator
Calculate your BMI in metric or imperial
Enter your height and weight in the units you prefer and see your BMI, its general category and a healthy weight range for your height.
BMI and category
See the BMI number and the general adult category it falls into.
Healthy weight range
The tool shows the weight range that corresponds to a BMI in the healthy range for your height.
Instant
Results update as you enter your numbers.
Private
Your measurements stay in your browser.
Free, no signup
No account and no limit.
Everything you need in BMI Calculator
- Metric and imperial units
- BMI value
- General adult category
- Healthy weight range for your height
- Instant results
- Runs in your browser
- Works on phone and computer
- Free and no signup
Tips for better results
- 1
Measure honestly
Use your current weight and height for a meaningful number.
- 2
BMI is a rough guide
It does not measure body fat or muscle, so athletes and some other people can get a misleading result.
- 3
Talk to a professional
For advice about your health, speak to a doctor rather than relying on a number.
0files uploaded
0signups needed
0cost to use
Tutorials on BMI Calculator
Short, practical guides that go with this tool.
🔒 Your privacy with BMI Calculator
BMI Calculator runs as client-side JavaScript inside your own browser tab. Your file or text is read, processed, and turned into a result on your device — it is never sent to, stored on, or seen by Toolkitties' servers. Closing or refreshing the page clears everything.
Frequently asked questions
Is BMI a medical diagnosis?
No. BMI is a general screening number and does not diagnose health. Talk to a doctor about your health.
How is BMI calculated?
It is your weight in kilograms divided by your height in metres squared.
Does it work for children?
The categories shown are for adults. Children and teenagers are assessed differently, so ask a doctor.
Can I use pounds and feet?
Yes. Switch to imperial units.
What is the healthy weight range?
It is the range of weights that gives a BMI in the standard healthy range for your height.
Is my information stored?
No. Everything is calculated in your browser.
Is BMI Calculator free to use?
Yes. BMI Calculator is 100% free, with no signup, no daily limit and no paid plans.
Do I need to create an account to use BMI Calculator?
No signup or login is required. Open the page and start using BMI Calculator immediately.
Is it safe to use BMI Calculator with private or sensitive files?
Yes. BMI Calculator processes your file locally in your browser using client-side code. The file itself is never uploaded to Toolkitties' servers.