Is the BMI calculator free to use?

Yes. It’s free and runs in your browser - no signup, no install.

Does it support both metric and imperial?

Yes. Enter height and weight in kg / cm or lb / ft-in - the BMI is calculated either way.

What BMI range is healthy?

For most adults, a BMI of 18.5 – 24.9 is considered in the healthy range. Values below are underweight; 25 – 29.9 is overweight; 30+ is obesity (three classes). Children and teens use different, age-specific percentiles.

BMI is a screening tool, not a diagnosis. It doesn’t distinguish muscle from fat, so athletes and very lean or very muscular people can score outside normal. Use alongside waist, activity, and clinician input.

What about children and teens?

Paediatric BMI uses age-and-sex-specific percentiles, not the adult categories. Check a growth chart or a paediatrician for interpretation.

Does the tool save my height or weight?

No. Inputs stay in your browser and are not stored on our servers.

BMI Calculator

Calculate Body Mass Index (BMI) and health status

Privacy-First • No Data Collection

BMI Calculator

Calculate your Body Mass Index (BMI) and get personalized health insights. Understand your weight status and receive tailored recommendations.

BMI Calculation

体重と身長を入力してBMIを計算します

単位系

重量 *

高さ *

BMIカテゴリーのリファレンス

標準的な BMI カテゴリーとその健康への影響

Underweight

BMI < 18.5

May indicate malnutrition

Normal Weight

BMI 18.5-24.9

Healthy weight range

Overweight

BMI 25-29.9

Increased health risks

Obese

BMI ≥ 30

Significant health risks