What is a healthy BMI range?

For most adults 18.5 to 24.9 is considered a healthy weight, 25 to 29.9 is overweight and 30 or above is obese. Below 18.5 is underweight.

What is the BMI formula?

Metric: weight in kilograms divided by height in metres squared. Imperial: weight in pounds divided by height in inches squared, multiplied by 703.

Is BMI accurate for everyone?

No. BMI does not distinguish muscle from fat, so athletes often read as overweight. It is a screening tool, not a diagnosis.

BMI Calculator | Tsinglin.tech

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Units

Height

Weight

—

Calculate your body mass index in metric or imperial units and see which range you fall into, plus your healthy weight window.

How to use BMI Calculator

Open the toolNo signup and nothing to install; it works as soon as the page loads.
Set “Units”
Set “Height”
Set “Weight”
Read the resultChange any input and the result is recalculated immediately.

Worked example with the defaults

YOUR BMI · Normal weight: 22.9

Nothing you enter leaves your device

All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.

That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.

What this tool does not do

BMI Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.

It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.

Frequently Asked Questions

What is a healthy BMI range?: For most adults 18.5 to 24.9 is considered a healthy weight, 25 to 29.9 is overweight and 30 or above is obese. Below 18.5 is underweight.
What is the BMI formula?: Metric: weight in kilograms divided by height in metres squared. Imperial: weight in pounds divided by height in inches squared, multiplied by 703.
Is BMI accurate for everyone?: No. BMI does not distinguish muscle from fat, so athletes often read as overweight. It is a screening tool, not a diagnosis.