Free gym calculators
Every number a lifter looks up mid-session or mid-plan, in one place. Nothing here asks for an email, everything runs in your browser, and every result gets its own link you can share or bookmark. If you'd rather have these numbers appear on their own as you train, that's what Tanko does.
Barbell math
The numbers you need with a bar in front of you.
1RM calculator
Estimate your one-rep max from any set, with four formulas and the full percentage table.
plate calculatorPlate calculator
What to hang on each side of the bar, in kg or lb, for any target weight.
warm up sets calculatorWarm-up calculator
A warm-up ladder to your working weight — sets, loads and reps, rounded to real plates.
rpe calculatorRPE calculator
Turn a set at a given RPE into an e1RM, and read the full RPE-to-percentage chart.
dots calculatorDOTS calculator
Score a powerlifting total across bodyweights — DOTS and the older Wilks.
Strength standards
Where your lifts sit against everyone else's, by bodyweight and sex.
Body and nutrition
Calories, macros and composition — estimates, not verdicts.
TDEE calculator
Maintenance calories from the Mifflin-St Jeor equation, plus cut and bulk targets.
macro calculatorMacro calculator
Protein, fat and carbs for cutting, maintaining or lean bulking.
bmi calculatorBMI calculator
BMI with the caveat lifters need: it can't tell muscle from fat.
ideal weight calculatorIdeal weight calculator
Four classic formulas plus the healthy BMI range — and why lifters sit above all of them.
body fat calculatorBody fat calculator
The US Navy tape method — body fat percentage from a tape measure, plus lean mass.
Your workouts deserve a witness
Choose a character, log your first session, and let it grow with you — free on iPhone.
Download on the App Store Launching soon on the App Store