BMI Calculator

Calculate Body Mass Index from your weight and height, and see the WHO adult category and healthy weight range for your height.

FreeNo sign-upRuns in your browserMobile-friendly
Health notice: BMI is an educational screening measure for adults, not a diagnosis. It does not account for muscle mass, age, sex, ethnicity or pregnancy. Please consult a doctor or qualified healthcare professional about your health.

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What does the BMI Calculator do?

BMI is weight in kilograms divided by height in metres squared. The World Health Organization classifies adult BMI as underweight (under 18.5), healthy (18.5–24.9), overweight (25–29.9) and obesity (30 or more).

BMI is a quick population-level screening tool. It can overestimate body fat in muscular people and underestimate it in older adults. Research also shows health risks may begin at lower BMI values for South Asian populations, and some health bodies use lower cut-offs (for example 23 for overweight) for Asian adults.

How to use the BMI Calculator

  1. Choose metric or imperial units.
  2. Enter your weight and height.
  3. Read your BMI, category and the healthy weight range for your height.

Examples

Metric

70 kg and 170 cm → 70 ÷ 1.70² = 24.2 (healthy range for this height: about 53.5–72.0 kg).

Imperial

154 lb and 5 ft 7 in → about 24.1.

Common use cases

  • General health awareness
  • Tracking changes over time
  • Learning how BMI is calculated

Features and benefits

  • Private by design — your data is processed on your device and never uploaded.
  • Free with no account, no watermark and no usage limits.
  • Works on phones, tablets and desktops in any modern browser.

Limitations to know

  • Not for children and teenagers, who need age- and sex-specific BMI charts.
  • Not suitable during pregnancy.
  • Not a measure of body fat or fitness.

Frequently asked questions

What is a healthy BMI?

For adults, the WHO healthy range is 18.5–24.9. Some Asian guidelines suggest lower thresholds.

Is BMI accurate for athletes?

Not very — muscle weighs more than fat, so athletes may show a high BMI while being healthy.

Is my data saved?

No. Calculation happens in your browser.

Embed this tool on your website

Add the free BMI Calculator to your blog or website. Paste the code into your page’s HTML; the tool runs in your visitors’ browsers and stays up to date automatically. Please keep the credit line below the tool.

Free to use on any website. The tool runs inside an iframe served from viptools.pk; nothing your visitors type is sent to your site or ours. Preview the embedded version.

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