Body Mass Index is a ratio of weight to height squared, used to screen for weight categories.

What is a healthy BMI range?

18.5 to 24.9 is considered the healthy weight range for adults.

Is BMI accurate for athletes?

BMI doesn't distinguish muscle from fat, so athletes may have a high BMI without being overweight.

Yes, for children use age- and gender-specific BMI percentile charts.

A BMI of 30 or higher is classified as obese. Consult a healthcare provider for guidance.

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Calculate your Body Mass Index (BMI) using height and weight. Supports metric and imperial units.

Height (cm)

Weight (kg)

Select Metric (cm/kg) or Imperial (ft/lbs).

Input your height and weight.

See your BMI value, category, and healthy weight range.

Calculate exact age from date of birth in years, months, days, hours, and minutes.

Calculate percentages easily: find X% of Y, percentage change, percentage difference, and more.