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Deadlift Max Calculator
Estimate your deadlift one-rep max from a near-failure set. Enter the weight and reps and this calculator computes Epley, Brzycki and Lombardi and averages them into a single estimate in your unit (lb or kg). A 405 lb deadlift for 3 reps estimates to about 430 lb; the spread between the formulas signals how precise the number is. Brzycki is most accurate for 1–6 reps and Epley for 6–10, and Epley is excluded from the average at 1–2 reps because it reads roughly 3% high on a true single. Because grip and lower-back fatigue accumulate quickly, low-rep deadlift sets tend to estimate the max most reliably. You also get a rep-max % training table — the load for 1–12 reps as a percentage of your deadlift 1RM — so you can program pulls by percentage. This is a fitness estimate: reps must be near-failure and accuracy degrades above about 10 reps.
Deadlift 1RM = average of Epley, Brzycki and Lombardi (unit preserved)
- Example: 405 lb × 3 → estimate ≈ 430 lb
- Rep-max % table gives your deadlift load for 1–12 reps
Frequently asked questions
What is my deadlift 1RM from 405 for 3 reps?
A 405 lb deadlift for 3 near-failure reps estimates to about 430 lb once Epley, Brzycki and Lombardi are averaged. Deadlift maxes read most reliably from low-rep sets, since grip and back fatigue limit high-rep pulls before pure strength does.
How many reps give the best deadlift max estimate?
A set of 1–5 reps taken close to failure gives the most accurate deadlift 1RM. Above about 10 reps the formulas diverge and tend to overestimate, so keep the rep count low for a trustworthy number.