Skip to content
+44 7825 367942My free assessment

BMI calculator

Your BMI worked out in 1 minute

In adults, a BMI of 18.5 to 24.9 counts as a healthy weight. Give your height and weight, and your result is shown against the World Health Organization grid along with what it truly means.

Work out your BMI

Your device does the calculation. No data is kept or sent. Adults only.

Glasses, a pen and an open notebook resting on a light coloured table

What is the BMI chart?

Adult reference chart from the World Health Organization
  1. Under 18.5Underweight
  2. 18.5 to 24.9Healthy weight range
  3. 25 to 29.9Overweight
  4. 30 and overObesity

BMI, short for body mass index, is found by taking the kilogram weight and dividing it by the height in metres multiplied by itself.

Example. For a height of 1.65 m and a weight of 72, the BMI equals 72 divided by 1.65 squared, which gives 26.4.

The drawbacks. BMI cannot tell muscle apart from fat. It gets things wrong for athletes, for people past 65 and in pregnancy.

Questions about the calculators

The other calculators

Waist size
The World Health Organization thresholds
Calories per day
What your body uses

Free assessment

Have your body fat checked at the free assessment.

The club phones you back whenever is easiest, over lunch, in the afternoon, or once evening comes.

A Bicester Nutrition morning, with members gathered at the tables

Your free assessment

  • No obligation
  • With a personal coach
  • At the club in Bicester, First Floor
Book your free assessment

Come before you have eaten, in clothes that are easy to move in.