One-Rep Max (1RM) Calculator
Estimate your maximum single-repetition lift strength using validated sports science formulas (Brzycki, Epley, Lombardi).
One-Rep Max (1RM) Calculator
Estimate your maximum single-repetition lift strength using validated sports science formulas (Brzycki, Epley, Lombardi).
Training Load Percentages
How to Use One-Rep Max (1RM) Calculator
1. Enter Lifted Weight & Reps
Enter the weight lifted and number of completed repetitions (1 to 10 reps) for bench press, squat, or deadlift.
2. Calculate Multi-Formula 1RM
Computes your estimated 1-repetition maximum using validated Epley, Brzycki, and Lander strength formulas.
3. Review Working Set Percentages
Inspect an itemized percentage table (50% to 95% of 1RM) to program your training blocks and warm-up sets safely.
How This Utility Works
Sports science strength training 1RM calculator. Computes one-repetition maximum bench press, squat, or deadlift capacity from submaximal multi-rep sets using the Brzycki, Epley, and Lombardi formulas, along with a full percentage training load table.
Your body metrics, age, weight, and fitness statistics remain exclusively on your device. No health data is stored in remote databases.
Frequently Asked Questions
Why estimate 1RM instead of testing to failure?
Estimating 1RM from 3-8 rep sets minimizes musculoskeletal injury risk while providing accurate target percentages for periodized strength cycles.