All calculators

Every tool is free, runs entirely in your browser, and is built on peer-reviewed formulas.

Calorie Deficit Calculator

Find your maintenance calories (TDEE), your ideal daily calorie target, and an interactive week-by-week weight loss forecast with a predicted goal date.

BMI Calculator

Calculate your Body Mass Index instantly with a beautiful visual scale, see your category, and understand what your score actually means for your health.

Water Intake Calculator

Get a personalized daily water recommendation based on your weight, activity level, and climate — in litres and glasses, with a visual hydration tracker.

Macro Calculator

Calculate your daily macros — protein, carbs, and fat — for your goal, with a personalized calorie target and a visual breakdown.

Body Fat Calculator

Estimate your body fat percentage with the U.S. Navy method, see your fitness category, and get your fat mass and lean mass breakdown.

Reaction Time Test

Test your reaction time — click the instant the box turns green and see your speed in milliseconds, with your best and average across multiple tries.

Ideal Weight Calculator

Estimate your ideal body weight using four peer-reviewed formulas (Devine, Robinson, Miller, Hamwi) plus your healthy BMI range, visualized beautifully.

Coming soon

Body Fat · Macros · Protein · TDEE · Running Pace · Calories Burned · Heart Rate Zones · Sleep — all built on the same shared engine.