Health calculators
Evidence-based calculators for daily calories and macros, due dates, cycle tracking, and running. Private by design: your numbers stay in your browser.
14 calculators
BMI
Body mass index with your category and healthy weight range.
OpenTDEE / calories
Your maintenance calories and macro targets for any goal.
OpenBody fat
Estimate body fat percentage with the US Navy method.
OpenIdeal weight
Healthy weight range for your height from several formulas.
OpenWeight loss
How long to reach your goal weight at a given calorie deficit.
OpenWater intake
How much water to drink a day for your weight and activity.
OpenDue date
Estimate your due date and track each week.
OpenOvulation
Estimate your fertile window. Private by design.
OpenSleep
Best bedtimes or wake times based on 90-minute sleep cycles.
OpenPace
Pace, time, and distance for any run.
OpenOne-rep max
Estimate your 1RM and a percentage training table.
OpenBAC
Estimate blood alcohol content. An estimate only, never for driving.
OpenLife expectancy
A population-average estimate from a life table.
OpenHabit streak
Count your current and longest streak the right way.
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