BMI Calculator

About the BMI Calculator

BMI Calculator returns your Body Mass Index using the standard WHO formula, BMI = weight (kg) ÷ height (m)². The tool also reports the healthy weight range for your height so you have a concrete target, not just a number.

How to use

1. Enter your weight in kilograms and height in centimetres.
2. Click Calculate to see BMI, category and healthy range.
3. Compare with the specialised BMI tools for context-specific interpretation.

Benefits & key features

• Quick screening tool for overall body composition.
• Uses the internationally-recognised WHO category cut-offs.
• Works for adults 18-65; children and seniors have their own charts.
• Pairs beautifully with TDEE and Body Fat calculators.

Pro tip

BMI doesn't distinguish muscle from fat — athletes may register 'overweight' while being very lean. Cross-check with the Body Fat (Navy) Calculator.

Why choose toolsfy for Calculators tools?

A good calculator should give you a defensible number you can paste into a spreadsheet, not a vague range behind a paywall. toolsfy's calculators show every formula, every step and every input so you can trust the result — and cross-check it. Because the math runs in your browser, there is no latency, no rate limit, and no risk of a server returning a cached, stale, or rounded answer.

Common use cases

• Engineering students verifying textbook answers on the bus, without burning mobile data on a heavyweight scientific-calculator app.
• Freelancers converting between units in client briefs — millimetres to inches, pounds to kilograms, US fluid ounces to millilitres — in seconds.
• Shopkeepers calculating the effective percentage change in margins after a supplier price hike, without firing up Excel on a point-of-sale tablet.

Frequently asked questions