BMI Calculator

Enter your height and weight to find your BMI, health category, and what your ideal weight should be for your height.

Weight (kg)

Height (cm)

Weight (lb)

Height (ft)

Height (in)

👆 Enter your weight and height to see results

🔒 Calculated right in your browser — no data goes anywhere

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BMI Categories (WHO Standard)

Underweight

BMI < 18.5

Normal ✓

18.5 – 24.9

Overweight

25 – 29.9

Obese

30+

What is BMI and why does it matter?

BMI (Body Mass Index) is an international method for measuring body composition based on the ratio of weight to height — the formula is weight (kg) ÷ height² (meters). It's used worldwide as a preliminary indicator of risk for diabetes, high blood pressure, and heart disease.

Keep in mind that BMI is only a general indicator. Muscular people (such as athletes) may show a high BMI while still being healthy, and the measure applies differently to older adults or pregnant women. Always consult a doctor before making health decisions.

Frequently Asked Questions

How is ideal weight calculated?

It shows the weight range needed to keep your BMI between 18.5 and 24.9 for your height — based on the WHO's normal category.

Is BMI different for men and women?

For adults (20+), the WHO's BMI scale is the same for both men and women. For children and teens (2-19 years), separate percentile charts by age and sex are used.

Does BMI measure body fat?

Not directly — it's a ratio of weight to height. To distinguish muscle from fat, you'd need to measure Body Fat Percentage (this tool is coming soon too).

Is my data stored anywhere?

No. The calculation happens entirely in your browser — your weight and height never reach a server.

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