WO Buddy tools
Free workout calculators
No account, no paywall — the same maths and formulas that power your training plan, as standalone tools you can use on their own.
1RM calculator
Estimate your one-rep max from any set taken close to failure, and see the working weight for every rep range from 1 to 12.
Open tool →Plate calculator
Tell it the weight you want on the bar and it works out exactly which plates go on each side.
Open tool →Rest timer
A between-set countdown that keeps running if your phone screen locks, with a clear tone when the rest is over.
Open tool →Workout calorie estimate
A ballpark burn for a session, from your bodyweight, how long you trained and how hard it felt.
Open tool →Training split picker
Answer three questions and see which split — full body, upper/lower, push/pull/legs — fits your week, with real sets and reps for each day.
Open tool →