Compare calculators

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

Body Fat Calculator (Navy Method)

Estimates body fat percentage using the U.S. Navy circumference method, which needs only a tape measure — no calipers or scales. It combines neck, waist, height (and hip for women) into a validated equation used by the military for body-composition screening.

Sex

Height (cm)

Neck Circumference (cm)

Waist Circumference (cm)

Hip Circumference (women) (cm)

Health

Ideal Weight Calculator

Estimate your "ideal" reference body weight from your height, biological sex, and body frame size using the Devine formula — originally created in 1974 for pharmacological dose calculation and still used clinically today. Useful as a rough planning anchor, but not a personal weight goal: it ignores muscle mass, age, and individual physiology.

Height (cm)

Gender

Body Frame

Key differences

	Body Fat Calculator (Navy Method)	Ideal Weight Calculator
Category	Health	Health
Inputs required	5	3
Result	Estimated Body Fat (%)	Ideal Weight (kg)
What it does	Estimates body fat percentage using the U.S. Navy circumference method, which needs only a tape measure — no calipers or scales. It combines neck, waist, height (and hip for women) into a validated equation used by the military for body-composition screening.	Estimate your "ideal" reference body weight from your height, biological sex, and body frame size using the Devine formula — originally created in 1974 for pharmacological dose calculation and still used clinically today. Useful as a rough planning anchor, but not a personal weight goal: it ignores muscle mass, age, and individual physiology.