All calculators

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

Nutrition & Diet

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.

Macro Calculator

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

Protein Intake Calculator

Find how much protein to eat per day for your goal, with per-meal targets and a simple, sustainable recommendation.

TDEE Calculator

Calculate your Total Daily Energy Expenditure — the calories you burn in a day — with a clear breakdown across every activity level.

BMR Calculator

Calculate your Basal Metabolic Rate — the calories you burn at rest — using three proven formulas, side by side.

Intermittent Fasting Calculator

Plan your intermittent fasting schedule — 16:8, 18:6, 20:4, or OMAD — with your exact eating and fasting windows on a visual timeline.

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.

Body Composition

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.

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.

Ideal Weight Calculator

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

More on the way

Protein Intake · Running Pace · Calories Burned · Heart Rate Zones — all built on the same shared engine.