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One Rep Max Calculator (1RM)
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How it is calculated
- Epley: 1RM = w × (1 + reps/30)
- Brzycki: 1RM = w × 36 ÷ (37 − reps)
Estimates only — not medical advice.
FAQ
Is 1RM estimation safe?
Estimating from 3–10 rep sets is much safer than testing a true max. Accuracy falls beyond ~10 reps.