BMI Calculator
Calculate your Body Mass Index and its WHO classification.
Body Fat Calculator
Estimate your body fat percentage with the US Navy method.
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⚠️ This calculator is for guidance only. It does not replace medical diagnosis or advice from a healthcare professional.
The body fat calculator estimates your fat percentage using the US Navy method, one of the most widely used for its simplicity: you just need a tape measure and your neck, waist and hip measurements. The result includes an ACSM classification by sex. It is an estimate: measurement technique affects accuracy. Use it as many times as you need: it is completely free, requires no sign-up and works directly in your browser.
Frequently asked questions
¿Cómo funciona el método US Navy?
Usa medidas de cinta (cuello, cintura y cadera en mujeres) y tu altura en una fórmula con logaritmos que estima el porcentaje de grasa corporal.
¿Es preciso medirse con cinta?
La precisión depende de la técnica: mide piel suelta, sin comprimir, y repite dos o tres veces. Como todo método indirecto, es una estimación orientativa.
¿Qué rangos de grasa son saludables?
En hombres, deportista 6-13% y normal 18-24%. En mujeres, deportista 14-20% y normal 25-31%. La grasa esencial mínima es ~2-5% (hombres) y ~10-13% (mujeres).
How does the US Navy method work?
It uses tape measurements (neck, waist and hips for women) and your height in a logarithmic formula that estimates your body fat percentage.
Is tape measuring accurate?
Accuracy depends on technique: measure loose skin, without compressing, and repeat two or three times. Like any indirect method, it is an estimate.
What fat ranges are healthy?
For men, athlete 6-13% and average 18-24%. For women, athlete 14-20% and average 25-31%. Minimum essential fat is ~2-5% (men) and ~10-13% (women).