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Health Calculators

BMI Calculator

Body Mass Index from height and weight in metric or imperial units, with your category and healthy weight range.

Enter values

Results update as you type.

Result

BMI

24.5

A BMI of 24.5 is classified as “healthy weight” for adults.

Category
Healthy weight
Healthy weight range
56.7–76.3 kg
Within healthy range
✓
Step-by-stepShow
  1. BMI = 75 kg ÷ (1.75 m)² = 24.49

Educational estimate only — not medical advice. Talk to a healthcare professional about your individual situation.

About the BMI Calculator

BMI compares your weight with your height to give a single number used for population screening. It does not measure body fat directly, so very muscular people may get a high BMI while being lean.

Also known as: body mass index, bmi chart, am i overweight, bmi calculator kg, obesity calculator.

How to use this calculator

  1. Enter units and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Open “Step-by-step” to see how the answer was worked out.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

BMI = weight (kg) ÷ height (m)²
kg
= body mass in kilograms
m
= height in metres

Worked example

Using the values pre-filled in the calculator above:

  • Units: Metric (kg, cm)
  • Weight = 75 kg
  • Height = 175 cm

the calculator returns:

  • BMI: 24.5
  • Category: Healthy weight
  • Healthy weight range: 56.7–76.3 kg
  • Within healthy range: ✓

Working

  1. BMI = 75 kg ÷ (1.75 m)² = 24.49

Frequently asked questions

What is a healthy BMI?

For adults, 18.5–24.9 is considered a healthy range, 25–29.9 overweight and 30+ obese. Children and teenagers use age- and sex-specific percentiles instead.

Is BMI accurate for athletes?

Not always. BMI cannot tell muscle from fat, so athletes often score “overweight” despite low body fat. Combine it with waist measurements or body-fat percentage.