№ 01 Calculators
The numbers, calculated honestly
Straightforward tools that run on your device, using the same formulas trainers and dietitians use — no sign-up, no data leaving your browser.
TDEE calculator
How many calories you actually burn per day — the honest number.
Macro calculator
Turn a calorie target into protein, carb, and fat grams.
Body fat calculator
Estimate body fat percentage from a tape measure — no calipers.
One-rep max calculator
Estimate your max lift from any set, with training percentages.
Heart rate zones
Your five training zones, tuned to your resting heart rate.
BMI calculator
Your Body Mass Index — with the context it usually leaves out.
Protein calculator
Your daily protein target in grams, by body weight and goal.
Water intake calculator
Your daily water target, scaled to weight, activity, and heat.
Ideal weight calculator
A healthy weight range for your height — four formulas plus BMI.
VO2 max calculator
Estimate aerobic fitness from a run test or your resting pulse.
Pregnancy & fertility
Date-based tools for trying to conceive and early pregnancy — private, and never stored.
Period calculator
Predict your next few periods, ovulation, and fertile window.
Ovulation calculator
Your fertile window and estimated ovulation day.
Due date calculator
Your estimated due date and how far along you are today.
Pregnancy week calculator
How far along you are — weeks, trimester, and progress.
Conception date calculator
When conception likely happened, from your period or due date.
Pregnancy weight gain
Your recommended weight-gain range by pre-pregnancy BMI.
hCG calculator
Your hCG doubling time and rate of rise from two blood tests.