RA

Fast online calculators across finance, health, time, math, science and more.

Lifestyle calculators

Quick, focused calculators for everyday health habits – weight, calories, water, sleep and steps – each with a richer page behind the tile.

Weight & composition

BMI & body fat

Body-mass index with ranges and a rough body fat estimate.

Metabolism & energy

BMR & calories

Resting metabolism and daily calorie targets from activity level.