Tools
1RM Calculator
Estimate your one rep max for strength and accessory lifts — back squat, front squat, deadlift, press. Enter the weight lifted and reps performed.
Enter a weight and reps above
Not for Snatch or Clean & Jerk
These formulas come from general strength training research and do not apply to the Olympic lifts. Snatch and clean & jerk are always done at low reps. Your 1RM for those is the heaviest weight you've hit in training or competition. Use this for back squat, front squat, deadlift, overhead press, and other accessory work.
Formulas Used
- Epley: w x (1 + r/30). Most widely used, works across most rep ranges.
- Brzycki: w x 36 / (37 - r). Most accurate for 1 to 10 reps.
- Lombardi: w x r0.1. Tends to read higher on bigger sets.
- Mayhew: (100 x w) / (52.2 + 41.9 x e-0.055r). Originally from bench press research.
All four are most reliable for sets of 1 to 6 reps. Past 10 reps the numbers start drifting.
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