What is the Epley formula for 1RM?

1RM = weight × (1 + reps/30). For example, lifting 100kg for 5 reps: 1RM = 100 × (1 + 5/30) = 116.7kg estimated max.

Which 1RM formula is most accurate?

No single formula is universally most accurate. The Epley formula performs well for sets of 5–10 reps. For very high rep sets (15+), the Brzycki formula tends to overestimate less.

1RM Calculator — Epley Formula

Calculate your one-rep max using the Epley formula (weight × (1 + reps/30)). Enter the weight lifted and reps performed to estimate your maximal strength for programming powerlifting and strength training.

1RM Epley

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Enter values above and press Calculate to see the result.

How It Works

Each component has a specific meaning:

Epley formula ) — The epley formula ) recorded for the scenario being assessed.

Note: Interpret the 1rm epley result against the thresholds and context described above.

How to Use

Enter the Epley formula ) for the scenario you are assessing. Calculate your one-rep max using the Epley formula (weight × (1 + reps/30)). Enter the weight lifted and reps performed to estimate your maximal strength for programming powerlifting and strength training. Use the 1rm epley result to inform your calculation.