Deadlift 1RM Calculator
A deadlift 1RM calculator for your max pull. Enter a working set to get Epley, Brzycki and Lombardi estimates plus their average, exact plates per side, and a percentage chart. Because deadlifts start from a dead stop every rep, touch-and-go sets inflate estimates — use dead-stop reps for honest numbers.
Result
| Epley | |
| Brzycki | |
| Lombardi |
Plates per side (to load the estimated 1RM)
Percentage chart
Formula & source
Brzycki: 1RM = w × 36 / (37 − r)
Lombardi: 1RM = w × r0.1
Reported max = mean of the three
Sources: Epley (1985), Brzycki (1993), and Lombardi (1989) — the three most-cited rep-max formulas in strength literature. All three are rep-based estimates, most accurate for sets of 1–10 reps; beyond 12 reps the error grows and the calculator clamps reps to 12. Unique to this page: all three formulas are shown side by side instead of hiding behind one number, so you can see the spread and judge the uncertainty yourself. Unique to this page: deadlift-specific caveat — the formulas assume each rep starts from a dead stop; touch-and-go reps add stretch-reflex kilos the formulas cannot see.
Worked example (you can verify by hand)
Input: 275 lb × 5 reps, 45 lb bar.
- Epley: 275 × (1 + 5/30) = 320.8; Brzycki: 275 × 36/32 = 309.4; Lombardi: 275 × 50.1 = 323.0
- Average 1RM ≈ 317.7 lb
- Per side: (317.7 − 45) / 2 = 136.35 → 45×3 + 1.35 remainder (fractional plates)
Expected output: ≈ 318 lb 1RM; load 3×45 per side plus fractional plates.
Limitations — what this cannot do
- Estimates, not measurements — only a true 1RM test (or meet total) is exact; formulas typically land within ±5% for sets under 10 reps.
- Technique, fatigue, sleep and warm-up change the real number day to day; retest or recalculate every 4–6 weeks.
- Not for beginners attempting maximal singles without a spotter and coaching — build base volume first.
- Conventional, sumo and trap-bar deadlifts are different lifts — estimate each from its own rep data. Belt/straps change the number; note what you used.
Disclaimer: Estimates for training planning only, not medical advice. Consult a professional.
FAQ
Do touch-and-go reps inflate the estimate?
Yes — the stretch reflex between reps adds kilos the formulas cannot account for. For an honest deadlift estimate, use dead-stop reps where the bar fully settles each time.
Sumo vs conventional — same calculator?
The math is the same, but treat them as separate lifts: estimate your sumo max from sumo sets and your conventional max from conventional sets.
How do I safely test a deadlift 1RM?
Warm up in small jumps, rest 4–5 minutes between heavy singles, stop when bar speed collapses or form breaks. Never max out with a rounded lower back.
Why is my deadlift estimate lower than my gym PR?
Gym PRs with straps, a whippy bar or generous plates often exceed strict estimates. The calculator models the lift, not the equipment.