WorldCalcs

BMI Calculator

Body Mass Index from your weight and height, with WHO adult category and healthy-weight range.

Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026

Your BMI

22.9Normal

Healthy weight range for your height (BMI 18.5–24.9): 56.7 – 76.3 kg

WHO adult categories: Underweight < 18.5 · Normal 18.5–24.9 · Overweight 25–29.9 · Obese ≥ 30.

What is BMI?

Body Mass Index (BMI) is a simple measure of body weight relative to height. It is widely used as a quick screening tool to put adults into weight categories that may signal health risk. BMI does not measure body fat directly.

How BMI is calculated

BMI = weight in kilograms divided by height in metres squared. In imperial units, BMI = 703 × weight in pounds ÷ height in inches squared. Example: 70 kg and 175 cm gives 70 ÷ 1.75² = 22.9, which is in the normal range.

All calculations happen in your browser. Nothing is sent, stored, or tracked.

Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer

How to use

Choose metric or imperial, then enter your weight and height. BMI updates instantly along with the category and the healthy-weight range for your height.

BMI is a screening tool, not a diagnosis. It does not separate fat from muscle and is not used for children, who use age- and sex-specific percentiles.

Frequently asked questions

What is a healthy BMI?+

For most adults a BMI from 18.5 to 24.9 is considered the normal range.

What are the BMI categories?+

Underweight below 18.5, normal 18.5–24.9, overweight 25–29.9, and obese 30 or above.

How do I calculate BMI?+

Divide your weight in kilograms by your height in metres squared, or use 703 × pounds ÷ inches² for imperial units.

Is BMI accurate for everyone?+

It is a useful screening tool but does not separate muscle from fat, so very muscular people can read high and it is not a diagnosis.

Does BMI work the same for men and women?+

The formula and adult categories are the same for both; BMI does not use sex.

Is BMI suitable for children?+

No. Children and teens use age- and sex-specific BMI percentiles instead of the fixed adult categories.

References

  • World Health Organization (WHO) — Body Mass Index (BMI) classification for adults.

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