BMI calculator with a healthy weight range for your height
Height, weight, answer. A BMI calculator that gives you the number, the band it falls in, and the weight range that would move you into the healthy one.
A simple number that most calculators overcomplicate
BMI is one division: weight over height squared. Yet searching for a calculator usually lands you on a page that wants an email address, or an app that asks you to create a profile and set goals before it will tell you a number you could have got from a napkin. The friction is entirely manufactured.
This app removes it. Open it, set metric or imperial, enter two figures, and the result appears with the category it falls into. There is no account, no onboarding sequence and no goal-setting flow to get past.
What it shows
One screen, and everything on it earns its place.
- Metric or imperial, switched in one tap. Centimetres and kilograms, or feet and pounds. The toggle sits at the top of the screen because most people know their own weight in only one system and get the conversion wrong when forced to convert.
- A gauge, not just a decimal. The result is placed on a gauge running from Under through Normal and Over to Obese, colour-coded, so you can see where you sit rather than having to remember what 26.4 means.
- The healthy weight range for your height. The number that is actually actionable is not your BMI — it is the weight range that would put you in the normal band at your height. The result card shows it.
- Age and gender, optional. Both can be left blank. BMI itself does not use them, and the app does not pretend otherwise or force you through fields you do not want to fill in.
What BMI is good for, and what it is not
BMI is a population-level screening measure. It does not distinguish muscle from fat, which is why a well-trained athlete can register as overweight, and it does not account for where body fat sits, which is what actually drives metabolic risk. It is a starting point for a conversation with a doctor, not a diagnosis, and this app does not dress it up as more than that.
If you want a measure that separates lean mass from fat, the circumference-based method in Lean is the better tool. BMI's virtue is that it needs only two numbers you already know.
When it is the right tool
The common case is a one-off check — you have been asked for your BMI on a form, or you have just weighed yourself and want to know where that puts you. Two numbers and it is done.
The second is tracking a direction of travel. If you weigh in weekly, watching the gauge move between bands is a clearer signal than watching the kilograms, particularly early on when the weight change is small but the category boundary is close.
Privacy
Nothing you type is stored on a server or sent anywhere — the calculation happens on the device and there is no account. The app is free and ad-supported.
It is an informational tool and not medical advice. If a result concerns you, the right next step is a GP, not an app.
Frequently asked questions
Does it work in feet and pounds? Yes. A toggle switches between metric (cm · kg) and imperial (ft · lbs) at any time.
Does it tell me my healthy weight range? Yes. Alongside the number and its category, the result card shows the weight range that would put you in the normal band for your height.
Do I need to create an account? No. There is no sign-up, no profile and nothing uploaded.
Is BMI accurate for muscular people? No, and that is a limitation of BMI itself rather than of this app — it cannot separate muscle from fat, so an athlete can register as overweight. A body-fat estimate is the better measure there; see Lean.
Is it available on iPhone? It is on Android via Google Play at the moment.