Calculator
One‑rep max calculator
Estimate 1RM from a submax set and get working percentages.
Submaximal
Estimate 1RM from a hard but safe set.
Two formulas
Averages Epley and Brzycki.
Training zones
Simple 70–90% working ranges.
One‑rep maxStrength
Enter weight and reps to estimate 1RM and %s.
Instant estimate
kg
Best for sets of 1–10 reps (up to 20 max).
Ready to calculate
Enter weight, reps and hit Calculate
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