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Health Calculators

BMI Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
kg
cm
Verified formula Private

Your BMI

24.2

Category (0=under,1=normal,2=over,3=obese)
1
Healthy weight (min)
53.5 kg
Healthy weight (max)
72.0 kg

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the BMI Calculator

The BMI Calculator works out your your bmi, along with 3 related figures in an instant. Enter weight and height and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the weight.
  2. Enter the height.
  3. Read off your your bmi, together with category (0=under,1=normal,2=over,3=obese), healthy weight (min) and healthy weight (max) — the calculator updates automatically, with no button to press.

Worked example

For example, with weight of 70 kg and height of 170 cm, the your bmi is 24.2.

Inputs used
Weight 70 kg
Height 170 cm
Results
Your BMI 24.2
Category (0=under,1=normal,2=over,3=obese) 1
Healthy weight (min) 53.5 kg
Healthy weight (max) 72.0 kg

Results are estimates for educational use, not professional advice.

Key terms explained

BMI
Body Mass Index — weight in kilograms divided by height in metres squared, a screening measure of body weight.

Frequently asked questions

BMI is your weight in kilograms divided by the square of your height in metres: BMI = weight ÷ height². A 70 kg person who is 1.75 m tall has a BMI of about 22.9.

For most adults, a BMI of 18.5 to 24.9 is considered healthy. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.

BMI does not distinguish muscle from fat, so very muscular people can show a high BMI while being healthy. Use it as a general guide alongside other health measures.

Yes. Children use age- and sex-specific BMI percentiles, and athletes with high muscle mass may sit outside the standard ranges. Ask a health professional for personalised advice.

Enter the weight. Enter the height. Read off your your bmi, together with category (0=under,1=normal,2=over,3=obese), healthy weight (min) and healthy weight (max) — the calculator updates automatically, with no button to press.

What Is a Healthy BMI?

For most adults, a healthy BMI is between 18.5 and 24.9. A BMI below 18.5 is classed as underweight, 25 to 29.9 as overweight, and 30 or above as obese. BMI is a quick screening tool, not a diagnosis — it does not distinguish muscle from fat.

1 min read

BMI Table: Your BMI by Weight

Reference table of BMI for BMI across a range of weight values — exact, engine-computed figures you can read off at a glance.

1 min read

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