Deadlift one rep max calculator
Updated 16 July 2026
Enter your best recent deadlift set and this calculator estimates your deadlift one rep max using the Epley and Brzycki formulas. Deadlifts estimate best from low rep sets, ideally 2 to 5 reps with each rep pulled from a dead stop.
Grip and lower back fatigue make high rep deadlift sets a poor basis for a max estimate, and touch and go reps inflate the count. If your set was touch and go, expect your true from the floor max to sit a little below the estimate.
Estimated one rep max
…
Enter a weight and reps to see your estimate.
| Percent of 1RM | Weight | Typical rep target |
|---|---|---|
| 95% | … | 2 reps |
| 90% | … | 3 to 4 reps |
| 85% | … | 5 to 6 reps |
| 80% | … | 7 to 8 reps |
| 75% | … | 9 to 10 reps |
| 70% | … | 11 to 12 reps |
| 65% | … | 13 to 15 reps |
Other one rep max calculators
How this is calculated
We estimate your max with the two most widely used and validated equations and show their average as the headline number. The Epley formula is weight × (1 + reps ÷ 30). The Brzycki formula is weight × 36 ÷ (37 minus reps). For a single rep both return the weight itself, and for 2 to 6 reps they typically agree within 2 to 3 percent.
The training load table applies standard percentage guidelines to your estimated max. Percentages and rep targets are a starting point, not a rule: bar speed, technique, and how you recover matter as much as the arithmetic.
Common questions
Why do deadlift 1RM estimates run high?
High rep deadlift sets are usually ended by grip or back fatigue rather than true strength failure, and touch and go reps use bounce. Both push the formula to overestimate; a strict set of 3 fixes it.
Sumo or conventional, does it matter?
The calculator does not care, but estimate each stance from its own test set. Most lifters have a meaningful gap between their sumo and conventional maxes.
Which formula should I trust, Epley or Brzycki?
Both are well validated and agree within a few percent for sets of 2 to 6 reps. Epley reads slightly higher at 8 or more reps, Brzycki slightly lower. We show both so you can see the honest range rather than a single false precision number.
How many reps should my test set have?
Estimates are most accurate from a hard set of 2 to 6 reps. Above 10 reps the relationship between reps and max strength gets noisy, so treat those estimates as a rough guide.
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