Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Fitness

BMI & Body Surface Area Calculator

Calculates your Body Mass Index using your height and weight. Use it to quickly screen for your weight category.

Height (cm)

Weight (kg)

Fill in the required fields to see your result.

Fitness

Body Fat Calculator (Navy Method)

Estimate your body fat percentage using the US Navy tape-measure method with only a few simple circumference measurements. No calipers or lab equipment required — results are suitable for health and fitness tracking.

Gender

Waist Circumference (cm)

Neck Circumference (cm)

Height (cm)

Hip Circumference (Women Only) (cm)

Fill in the required fields to see your result.

Key differences

	BMI & Body Surface Area Calculator	Body Fat Calculator (Navy Method)
Category	Fitness	Fitness
Inputs required	2	5
Result	Body Mass Index (kg/m²)	Body Fat Percentage (%)
What it does	Calculates your Body Mass Index using your height and weight. Use it to quickly screen for your weight category.	Estimate your body fat percentage using the US Navy tape-measure method with only a few simple circumference measurements. No calipers or lab equipment required — results are suitable for health and fitness tracking.