BMI, body fat, calories, macros and pace — using the formulas clinicians use.
Your body mass index, the weight range that matches it, and an honest account of what the number can and cannot tell you.
How many calories you burn in a day, and what to eat to lose, maintain or gain — using the equation dietitians actually use.
The calories your body burns doing absolutely nothing — computed three different ways so you can see the spread.
Estimate body fat from a tape measure using the US Navy circumference method — no calipers required.
Four clinical formulas and the BMI range, side by side — because “ideal weight” is a range, not a number.
Turn a calorie target into grams of protein, carbohydrate and fat — with splits for balanced, low-carb, high-protein and keto approaches.
Pace, time or distance — solve for whichever one you are missing, and get race splits for every standard distance.
Every calculator in this category shows the formula it applies, so you can check the method rather than trusting a number. Results update as you type, and the share button encodes your inputs into the link so you can send a specific calculation to someone else.
Nothing you enter leaves your device. All 7 tools here run entirely in your browser.