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Health & fitness·Fitness

BMI Calculator

Compute Body Mass Index from height and weight in metric or imperial. Fully client-side — no account, uploads, or remote storage.

Added Apr 18, 2026 · Updated May 1, 2026

Scenario A

Quick examples

Input

Result

Enter a value for height to see your result.

How it works

The Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It is a screening tool to determine if a person is at a healthy weight range.

Formula

BMI = weight (kg) / height² (m)

weight
Body weight in kilograms
height
Height in meters

Step by step

  1. 01Enter your height in meters
  2. 02Enter your weight in kilograms
  3. 03The system will calculate your BMI
  4. 04Interpret the result using the BMI categories

Examples

Average adult

A 1.75m tall adult weighing 70kg has a healthy BMI of 22.9.

Inputs

Height:
1.75
Weight:
70

Result

Body Mass Index:
22.9
Note: BMI is a screening tool, not a diagnostic device. Athletes and bodybuilders with high muscle mass may have a high BMI despite being healthy.

Related guides

  • What Is BMI?

    Learn what Body Mass Index (BMI) is, how it is calculated, what BMI ranges mean for health, and when BMI may not be the best measure to use.

  • When BMI Is Misleading -- Accuracy Limits

    When BMI Is Misleading -- Accuracy Limits -- BMI is cheap population screening: weight divided by height squared. It ignores body composition, fat.

Frequently asked questions

What is a healthy BMI range?

A healthy BMI is typically between 18.5 and 24.9. A BMI of 25-29.9 is considered overweight, and 30+ is obese.

Why might BMI be wrong for athletes or very muscular people?

BMI uses only height and weight. Muscle is denser than fat, so strength athletes can land in overweight or obese categories despite low body fat. Waist circumference, body composition scans, or performance metrics may be better secondary checks.

Does BMI apply the same way across ethnicities and ages?

Population cutoffs were largely developed from certain cohorts. Some health authorities suggest different action thresholds for South Asian, Asian, or older adults. Treat BMI as a screening flag, not a diagnosis.

Is BMI useful for teenagers or children?

Pediatric BMI is interpreted with age- and sex-specific growth charts. This adult-oriented calculator is not a substitute for percentile-based pediatric screening.

Can I use BMI alone to set a weight goal?

Use it as one input alongside energy balance, waist size, blood pressure, glucose, sleep, and how you feel in training. A registered dietitian or clinician can help set realistic targets for your context.