Repetition Maximum (Rep Max) Calculator
Enter weight and reps to estimate your one-rep max and submaximal loads.
Input Data
Weight
Reps
Results
Estimated one-rep max.
93.3
Explanatory note about the result.
1RM ≈ 80 × (1 + 5/30) = 93.3 kg（Epley 估算）。
At a glance:Estimate 1RM and percentage loads from a submaximal set. Epley: 1RM = weight × (1 + reps/30). A load for N reps ≈ 1RM ÷ (1 + N/30). Complements the 1RM calculators.
Formula
1RM = weight × (1 + reps/30).
Load for N reps ≈ 1RM / (1 + N/30).
How to Use
- Enter the weight you lifted and the reps completed.
- The tool returns the estimated 1RM.
Case Studies
80 kg × 8 reps (Epley)
1RM = 80 × (1 + 8/30) = 101.3 kg.
FAQ
How do I use this for programming?
Compute your 1RM, then take a percentage (e.g. 80%) for working sets.
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References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.