Free BMI Calculator — No App, No Account, No Health Tracking
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You just want to know your BMI. You don't want to create a health profile, connect your Apple Health, agree to terms of service, or get retargeted with weight-loss ads for the next six months.
The free BMI calculator on this page does exactly one thing: enter your height and weight, and it gives you your BMI. No account. No email. No app. No data stored anywhere. Your number, instantly.
Why Most BMI Tools Want Your Email
Free BMI calculators have quietly become lead magnets. Apps like MyFitnessPal, Noom, and Weight Watchers offer BMI checks as part of a signup funnel — you enter your stats, and then you're asked to create an account, set up a weight-loss goal, or start a free trial.
Even Google's built-in BMI tool is anonymous, but it gives you a number with no context. The free BMI calculator here shows your BMI category, your healthy weight range, and a visual scale — all without asking who you are.
What You Need to Check Your BMI (Just Two Numbers)
BMI is calculated from height and weight. That's it. The formula is:
- Imperial: BMI = (weight in lbs ÷ height in inches²) × 703
- Metric: BMI = weight in kg ÷ height in meters²
The free BMI calculator accepts both imperial (pounds, feet and inches) and metric (kilograms, centimeters). Pick whichever you think in — no conversion needed.
Sell Custom Apparel — We Handle Printing & Free ShippingWhat You Get After Entering Your Numbers
Once you enter height and weight, you'll see:
- Your BMI number to one decimal place
- Your BMI category — Underweight, Normal weight, Overweight, or Obese
- Your healthy weight range for your height
- A visual scale showing where you land
No account needed for any of it. The calculation runs entirely in your browser — nothing is sent to a server.
BMI Categories — Quick Reference
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
These are the WHO adult BMI categories used worldwide. They apply to adults 20 and older regardless of age or sex, though the clinical interpretation varies — see the posts below for nuances around athletes, older adults, and ethnicity-based cutoffs.
Other Free Health Calculators — Also No Account Needed
If you want to go deeper without signing up for anything:
- The calorie calculator estimates your daily calorie needs (TDEE) — no account, no diet plan signup
- The body fat calculator estimates body fat % using the Navy tape method — just measurements, no scale data saved
All tools on this site run entirely in your browser. No server. No tracking. No ads based on your health data.
Frequently Asked Questions
Does this BMI calculator require an account or email?
No. Enter your height and weight and the result appears immediately. No account, no email, no registration of any kind.
Is my height and weight data stored anywhere?
No. The calculation runs entirely in your browser using JavaScript. Your numbers are never sent to any server and are not stored or logged anywhere.
Can I use this on my phone without downloading an app?
Yes. The calculator works in any mobile browser — Safari on iPhone, Chrome on Android — with no app download required.
What units does the calculator support?
Both imperial (pounds, feet and inches) and metric (kilograms, centimeters). Switch between them with one tap.