Beginner-friendly tools

BMI Calculator

Estimate your adult BMI using your height and weight and see which category it falls into.

Enter your details

Enter your height and weight, then click Calculate BMI to see your adult BMI estimate and category.

BMI is a quick screening estimate based on your height and weight. It gives a simple category that can be useful as a starting point.

It does not directly measure body fat and it cannot tell the difference between fat and muscle.

BMI can be useful for a broad overview, but it should not be treated as a diagnosis on its own.

Body composition, waist measurement, training status, and wider health factors can all matter too.

This example shows how the calculator uses your height and weight to estimate BMI and place it into an adult category.

Treating BMI as a diagnosis instead of a screening tool.
Using an adult BMI result as though it applies to children or teenagers.
Assuming BMI always reflects body composition accurately for very muscular people.

Estimate how long a realistic weight goal may take.

Estimate your maintenance calories from your body details and activity.

Estimate a practical daily fluid target.

Read a simple guide to realistic progress and expectations.

BMI is a screening tool for adults and should not be used on its own to judge overall health.