Your numbers, in one tap.
Enter your height, weight, age, and sex - BMI Calculator gives you your body mass index, where it sits on the WHO scale, your ideal-weight range, and an estimate of body fat. No sign-up, nothing to learn.
A scale gives you a weight.
This tells you what it means.
More than a single number.
BMI is the headline, but it's only the start. The same few inputs give you a full read on where you stand and where a healthy range sits for your height.
Live BMI.
Your body mass index updates the moment you change a value - no calculate button, no waiting. A clear figure, rounded the way you'd expect.
WHO classification.
See exactly which band you fall into - from underweight through the obesity classes - using the World Health Organization's standard ranges, colour-coded for a glance.
Ideal-weight range.
For your height, the app shows the weight range that keeps your BMI in the healthy zone, plus an ideal-weight figure adjusted for your sex.
Three numbers in,
the full picture out.
No onboarding, no account. Open the app and your last entry is already there, ready to adjust.
Enter your details.
Tap in your height, weight, age, and sex. Switch between metric and imperial at any time - the figures convert for you.
Read your result.
Your BMI, classification, ideal-weight range, and estimated body fat appear together on one screen.
Come back anytime.
Your entry is saved on the device, so checking in again after a change is a single tap.
Where your number lands.
Small, fast, and private.
BMI Calculator does one job and does it well - without asking for an account, an email, or anything it doesn't need.
Estimated body fat.
Alongside BMI, the app estimates your body-fat percentage from your BMI, age, and sex - a useful second reference point.
Either unit system.
Work in kilograms and centimetres or in pounds, feet, and inches. Switch whenever you like; nothing gets re-typed.
Remembers your entry.
Your last height, weight, age, and sex are kept on the device, so the app opens where you left off.
No account, no cloud.
There's no sign-up and no server. What you enter stays in the app's private storage on your phone.
Clean, focused screen.
Everything lives on a single view - inputs at the top, results below. Nothing to dig for.
Free on Android.
The app is free, supported by a small banner ad. No subscription, no paywall on the result.
No account. No cloud sync.
Your height and weight stay on your device.
The short version.
How is BMI calculated?
Body mass index is your weight in kilograms divided by the square of your height in metres (kg/m²). The app does the conversion for you whether you enter metric or imperial values, and classifies the result on the World Health Organization scale.
Is BMI a measure of health?
BMI is a quick screening figure, not a diagnosis. It doesn't distinguish muscle from fat and doesn't account for build, age, or fitness. Use it as a rough reference and talk to a healthcare professional for anything that matters. See our Terms of Service.
Does it need an account or the internet?
No account, and no connection is needed to calculate. Your height, weight, age, and sex are stored only on your device. The app connects only to load its banner ad.
What data does it collect?
Your inputs never leave your phone. The free app shows ads via Google AdMob and reports crashes via Firebase to help us fix bugs. In the EEA you're shown a consent choice for ad personalization. Full detail is in the Privacy Policy.
Know your number.
BMI, classification, ideal weight, and body fat - from a few quick inputs. Free on Android.
GET IT ON Google PlayBMI Calculator is an informational fitness tool. Body mass index, ideal-weight, and body-fat figures are general estimates and are not medical advice, a diagnosis, or a substitute for professional care. BMI does not distinguish muscle from fat and may not be appropriate for athletes, children, pregnant people, or older adults. Always consult a qualified healthcare professional about your health.