1RM Calculator
Enter a weight you lifted and how many reps you got. Apex estimates your 1RM with the Epley and Brzycki formulas and turns it into training zones you can actually use.
Epley formula
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Brzycki formula
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Estimated 1RM (average)
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Estimates update live as you type.
Example based on a 100 kg 1RM — enter your lift above to personalize the table.
| %1RM | Load | Typical reps | Zone |
|---|---|---|---|
| 95% | 95 kg | 2 | Max strength |
| 90% | 90 kg | 4 | Max strength |
| 85% | 85 kg | 6 | Strength |
| 80% | 80 kg | 8 | Strength |
| 75% | 75 kg | 10 | Hypertrophy |
| 70% | 70 kg | 12 | Hypertrophy |
| 65% | 65 kg | 15 | Endurance |
| 60% | 60 kg | 20 | Endurance |
Formula-based estimates are a starting point, not a verdict. Accuracy varies by exercise (they work best on big barbell lifts like the squat, bench press, and deadlift), by rep range, and by your training experience — beginners often land above or below the real number.
Never attempt a true max lift casually. If you decide to test a real 1RM, do it fresh, after a proper warm-up, with solid technique, safety pins or a spotter — and ideally with an experienced coach watching.
Apex logs every set, detects new PRs automatically, and updates your estimated 1RM per exercise over time — so your training percentages stay honest without max testing every month.
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