One-rep max calculator
Estimate your one-rep max from any set, counting reps left in reserve, with loads for every rep range.
How it works
Uses the Epley formula: load × (1 + reps ÷ 30).
Reps left in reserve are counted as reps the set could have done, so you never need to test a true max.
Estimates are best from sets of 3-10 reps.
Read more: How to build muscle.
Track it every day, free
The Fit app turns these numbers into a daily plan for food, training and recovery, and adjusts them as you go. No account, and only you can read your data.