One-Rep Max (Epley)
Estimate max lift from submaximal sets.
Inputs
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Formula
1RM = weight × (1 + reps/30)
Epley formula estimates one-repetition maximum from a heavy set. Most reliable for ≤12 reps.
Worked example
100 kg for 5 reps estimates 1RM ≈ 117 kg.
Where this can give the wrong answer
- Reps above 12 rejected — accuracy falls.
- Different formulas (Brzycki) differ a few kg.
- Not for rehab or untrained lifters pushing limits.
FAQ
- Estimate only — always use spotters and progressive loading.