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BMI Calculator

Enter your height and weight in metric or US units to see your body mass index (BMI), the adult category and the weight range for your he…

Enter your values

Result

BMI
22.9
Category for adults
Healthy weight range
Weight range for BMI 18.5 to 24.9 at this height
56.7 to 76.3 kg
  • BMI is a screening number for adults aged 20 and over. It does not measure body fat or health, and it is not a diagnosis. For children and teenagers, doctors use percentile charts. Speak to a health professional about your health.

How to use BMI Calculator

  1. Choose metric (centimetres and kilograms) or US units (feet, inches and pounds).
  2. Enter your height and weight.
  3. Read your BMI and the adult category.
  4. See the weight range that gives a BMI from 18.5 to 24.9 at your height.

About this tool

Body mass index is weight in kilograms divided by height in metres squared. A person who is 1.75 metres tall and weighs 70 kg has a BMI of 70 ÷ (1.75 × 1.75) = 22.9. The World Health Organization groups adult BMI as under 18.5 underweight, 18.5 to 24.9 healthy weight range, 25 to 29.9 overweight and 30 and above obesity range.

BMI is a quick screening number, not a measure of health. It cannot tell muscle from fat, it does not show where weight is carried, and the categories do not fit everyone equally, for example very muscular people or older adults. It also applies to adults aged 20 and over. For children and teenagers, doctors compare BMI with percentile charts for their age and sex, which this calculator does not do.

Use the result as a starting point for a conversation with a doctor or other health professional, who can look at your whole situation. This calculator gives general information and is not medical advice.

How it is calculated

BMI = weight (kg) ÷ height (m)². In pounds and inches, the same number is 703 × weight (lb) ÷ height (in)².

The weight range uses the BMI limits 18.5 and 24.9 with your height.

Worked examples

  • 70 kg at 175 cm gives a BMI of 22.9, which is in the healthy weight range.
  • 154 lb at 5 ft 9 in gives a BMI of 22.7, about the same as the first example.

Tips for better results

  • Measure height without shoes and weight at the same time of day for steadier numbers.
  • Treat BMI as one number among several. Waist size, fitness and medical history matter too.
  • If you are worried about your weight, speak to a doctor or other health professional.

Frequently asked questions

How is BMI calculated?

Divide weight in kilograms by height in metres squared.

What is a healthy BMI?

For most adults, the WHO healthy range is 18.5 to 24.9. It is a screening range, not a personal target.

Is BMI accurate for athletes?

Often not. It does not separate muscle from fat, so a muscular person can have a high BMI without excess body fat.

Can I use it for a child?

No. Children and teenagers are assessed with age and sex percentile charts.

Are my numbers saved or sent anywhere?

No. The calculation runs in your browser on your own device. Nothing you type is sent to Paul Digital or any other server.

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Privacy

The calculation runs in your browser on your own device. The numbers you type are not sent to Paul Digital or any other server. Results are estimates from the numbers you enter and are not financial, tax or legal advice.