Deadlift 1RM Estimator
Your one-rep max (1RM) on the deadlift is the heaviest single rep you can pull from the floor to lockout with clean form, and it's the number every powerlifter, strongman, and serious lifter builds their entire program around. Plug in a recent top set — say, 405 lbs for 5 reps — and this calculator runs the Epley formula (1RM = w × (1 + r/30)), Brzycki (1RM = w × 36/(37 − r)) and Lombardi (1RM = w × r^0.10) so you can cross-check before you load the bar for a true PR attempt. The reason this matters: most well-coached lifters never test a true 1RM more than two or three times a year. Smolov, 5/3/1, Sheiko, Conjugate, Calgary Barbell — all of them prescribe working weights as a percentage of an estimated max, not a tested one. ExRx and Stronger by Science put the 1RM deadlift bands roughly at: untrained 135 lbs, novice 235 lbs, intermediate 335 lbs, advanced 435 lbs, elite 535+ lbs for a 180 lb male — women run about 60–65% of those numbers at matched bodyweight. Where you fall on that ladder dictates how often you should max, how big your jumps can be, and whether your weak point is off the floor or at lockout.
When to use this calculator
- USAPL/USPA meet attempt selection. You hit 500 lbs × 3 in the gym at week 10 of an 11-week peak. Epley says 550 lbs is your true max. Standard meet strategy: open at 88–90% (485 lbs — almost a guaranteed white-light), second attempt at 95% (520 lbs), third at 100–102% (550–560 lbs). Bombing a meet because you opened at 95% is one of the most common rookie mistakes — the calculator gives you a sane opener floor.
- 5/3/1 Training Max reset. Wendler's 5/3/1 prescribes a Training Max equal to 90% of your true 1RM, and your AMRAP top set on the 1+ week tells you when to bump it. If your TM is 405 lbs and you hit 405 × 6 on a 1+ day, Epley says your real 1RM has moved to 486 lbs — bump the TM 10 lbs for the next cycle instead of guessing.
- Smolov Jr for deadlift (3-week peak). Smolov Jr uses percentages of 1RM ranging from 70% (sets of 6) up to 90% (sets of 3) across three weeks. You can't run it from a stale max — plug in your last paused top set, get a fresh estimate, and load each session against that number. A lifter pulling 455 × 3 (est. 1RM ≈ 500 lbs) would hit 90% × 3 × 5 on day three of week three at 450 lbs.
- Strongman event prep — deadlift for reps. A 600 lb max-rep event with a 60-second clock asks for as many reps as possible at a fixed weight. If your gym 1RM is 700 lbs, that's 86% of 1RM — Epley's table predicts around 5 reps before grinding. Knowing this lets you train the specific weight at the right rep target instead of guessing.
- Gym PR testing without spiking CNS. Conventional wisdom (Mike Tuchscherer, RTS) is that pulling a true 1RM once a month tanks recovery for 7–10 days. Estimating off a 3RM or 5RM in your second-heaviest week keeps stress lower while still giving you a number you can program against — useful in any 12+ week block where you can't afford a real test mid-cycle.
Calculation Example
- 315 lbs × 5 reps
- 1RM = 315 × (1 + 5/30) = 367.5 lbs
How it works
4 min readThe three formulas that matter
Three equations dominate deadlift 1RM estimation. They were all derived from regression studies on bench press and squat (Epley used Nebraska lifters; Brzycki used Penn State athletes), and they all do roughly the same job inside the 2–6 rep window.
Epley (1985):
1RM = Weight × (1 + Reps / 30)Brzycki (1993):
1RM = Weight × 36 / (37 − Reps)Lombardi (1989):
1RM = Weight × Reps^0.10Worked example with a 405 × 5 deadlift:
Epley and Lombardi cluster together; Brzycki trends 3–4% lower. For deadlifts specifically, Stronger by Science's 2017 1RM meta-analysis (Helms, Cronin, et al.) found Epley and Lombardi were the closest match to tested maxes when input sets were ≤6 reps; Brzycki underestimated, which is why old USAPL coaches preferred it as a safety-conservative opener pick.
Why deadlift 1RM accuracy is lower than bench
The deadlift hits a different physiological wall than the bench press. Bench is largely a strength-skill expression; deadlift is a CNS-and-grip event. Three things degrade the predictive accuracy of any formula on the pull:
1. CNS fatigue accumulates fast. Greg Nuckols at Stronger by Science has noted that rep drop-off curves on the deadlift are steeper than on squat or bench — past rep 4 or 5, technique breakdown (rounding, hitching, looking up) artificially shortens the set. A grindy 6th rep at 405 lbs is rarely a clean lift, which means your input data is dirty.
2. Grip is the weak link for raw lifters. Mixed grip can hold ~10% more than double-overhand at the same wrist strength; hook grip adds 5–8% on top of double-overhand once your thumbs adapt (4–8 weeks of conditioning). If your last set failed because the bar slipped at rep 4 — not because your back gave out — the formula will underestimate your true 1RM by 30–50 lbs.
3. Conventional vs sumo is not one lift. The bar path, hip angle, and quad-vs-back demand split is so different that most lifters' two stances differ by 15–40 lbs at the top end. Test in one stance, program in the same stance. Don't pull a sumo 5RM and plug it in to set your conventional opener.
%1RM / reps reference table for the deadlift
This table reflects what Calgary Barbell and Stronger by Science publish for raw deadlifters with average-to-good technique. Equipped lifters (suit, briefs) will hit higher reps at the same percentage.
| %1RM | Reps (raw deadlift) | Use case |
|---|---|---|
| 100% | 1 | Meet third attempt / true PR |
| 95% | 2 | Heavy single, opener at meet |
| 92.5% | 3 | Top set on intensity day |
| 90% | 3–4 | 5/3/1 week 3 1+ AMRAP |
| 87.5% | 4 | Strength block working weight |
| 85% | 5 | 5/3/1 week 2 3+ AMRAP |
| 80% | 6 | Volume strength work |
| 75% | 7–8 | Hypertrophy / back-off sets |
| 70% | 10 | Speed/technique work, RPE 6–7 |
| 65% | 12 | Conditioning, RPE 5 |
Note that the deadlift typically caps out at 1–2 fewer reps per %1RM than the squat or bench — a 405 squat for 5 might correspond to a 495 1RM, but a 405 deadlift for 5 more often projects to a 450–470 1RM, not 495.
Programming this in: 5/3/1, Smolov Jr, Sheiko
Jim Wendler's 5/3/1 — runs deadlift one day per week, sets the Training Max at 90% of estimated 1RM, and uses a 65/75/85% wave (week 1), 70/80/90% wave (week 2), and 75/85/95% wave (week 3) with an AMRAP on the top set. If your Epley-estimated 1RM is 500 lbs, your TM is 450 lbs and your week-3 top set is 95% × 450 = 427.5 lbs, rounded to 425 lbs.
Smolov Jr for deadlift — the 3-week version of Sheiko's Smolov, often used as a peaking block. Day 1 of week 1: 70% × 6 × 6. Day 2: 75% × 7 × 5. Day 3: 80% × 8 × 4. Day 4: 85% × 10 × 3. At a 500 lb 1RM that's six sets of 350 lbs on day one — high volume, and absolutely brutal on grip and lower back. Most lifters can only run Smolov Jr on the deadlift once or twice a year.
Boris Sheiko's templates — Russian-style programming with sub-maximal singles and doubles at 80–90% across 20+ sessions per macrocycle. Sheiko explicitly prescribes against testing true 1RMs in-cycle; you use the Epley/Brzycki estimate at the end of each block, ratchet up the training max 2.5–5%, and run the next block off the new number.
Common errors that wreck the estimate
1. Testing too often. Pulling a true 1RM or an honest 3RM more than once every 6–8 weeks accumulates so much fatigue that the data becomes useless. A 500-lb gym 3RM with three days of accumulated fatigue is really a 525-lb 3RM well-rested.
2. Counting hitched reps. USAPL/USPA judges call hitching (resetting the bar on the thigh mid-rep) immediately. If your input set includes a hitched rep, drop the rep count by 1 before plugging in.
3. Lockout assist from the belt or straps. A belt is fine for testing as long as you train and compete with one. Straps invalidate the estimate for raw competition prep — they let you pull weight your grip otherwise couldn't lock out, which inflates the 1RM by 5–10%.
4. Plugging in reps from a touch-and-go set. Touch-and-go (no full deadweight reset between reps) can add 1–3 reps to a top set vs paused/dead-stop. Most coaches expect dead-stop reps for accurate 1RM math.
5. Ignoring bar whip and equipment. A Texas deadlift bar with whip and aggressive knurling will let you pull 10–25 lbs more than a stiff power bar at the same true strength. Test on the bar you'll compete on, or assume your meet 1RM will be ~15 lbs below your gym estimate if your gym uses a softer bar.
Frequently asked questions
What's a good deadlift 1RM for a 180 lb man?
Using ExRx and Stronger by Science standards for a 180 lb male: untrained ~135 lbs, novice ~235 lbs, intermediate ~335 lbs, advanced ~435 lbs, elite 535+ lbs. The 'gym strong' benchmark most lifters chase — 2× bodyweight — is 360 lbs at 180. Three-plate (315 lbs) is the cultural milestone for an intermediate lifter; four-plate (405 lbs) puts you in the top 10% of recreational gym-goers; five-plate (495 lbs) is advanced-to-elite and competitive at a local USPA/USAPL meet in the 83 kg or 93 kg class.
How often should I deadlift to improve my 1RM?
Once or twice per week is the sweet spot for almost everyone. 5/3/1, Texas Method, and Starting Strength all program the deadlift 1x/week. Sheiko and Calgary Barbell run it 2x/week — one heavy session and one volume session with paused or deficit work. Pulling heavy 3x/week is rare outside of pro-level strongmen and only works for 3–6 weeks at a time. The deadlift's high CNS and lower-back cost means more isn't better — most lifters PR faster on 1x/week with hard accessory work (RDLs, rows, hip thrusts) than on 3x/week of straight deadlifts.
Why is my gym 1RM lower than what this calculator predicts?
Three usual culprits. (1) Fatigue carryover. You're testing the day after a heavy squat session — CNS isn't fresh. Test deadlift on day one of the training week, fully rested, after 2–3 lighter days. (2) Suboptimal warm-up. Most lifters under-warm for max deadlifts. A good ramp: 135×5, 225×3, 315×2, 385×1, 425×1, then attempt. Going from 315 straight to a 500 lb attempt cold-pulls 30–50 lbs off your real max. (3) Mental side. True 1RMs are 80% nervous system and 20% physical. Caffeine 300–400 mg, ammonia, a training partner yelling, and a hard hate-the-bar mindset routinely add 15–30 lbs over a cold-attempt scenario.
Conventional vs sumo — does strength carry over?
Partially. Stronger by Science's analysis of intermediate-to-advanced lifters who switched stances mid-cycle shows about 70–80% strength carryover in the first 2–4 weeks, climbing to near-full equivalence after 8–12 weeks of dedicated training. Practical implication: if you pull conventional 500 and switch to sumo, expect to grind 405–420 in week one, hit 450–460 by week six, and approach 500 again by week ten. Lifters with long femurs and short torsos often gain 20–40 lbs by switching to sumo; lifters built like Eddie Hall (long arms, big back) almost always pull more conventional.
Mixed grip, hook grip, or straps for testing 1RM?
For a true gym test: mixed grip is the standard — one hand over, one hand under, no straps. Adds ~10% holding capacity vs double-overhand. Risk: biceps tear on the supinated arm if the bar rolls out of position; happens to ~1 in 1,000 lifters. Hook grip (thumb pinned under index and middle finger) is what every elite competitive powerlifter uses — Hafthor, Brian Shaw, Cailer Woolam — because it's stronger than mixed and balanced. Painful for 4–8 weeks while thumb skin and joint adapt. Straps are fine for volume training but invalidate raw-competition 1RM estimates — they let you lock out 5–10% more than your unassisted grip allows.
Should I belt or no-belt for my 1RM test?
Belt — assuming you train and compete with one. A 10 mm lever or prong belt typically adds 5–10% to a max deadlift by increasing intra-abdominal pressure and reducing spinal shear. Test the way you'll compete. If you've never belted, don't strap one on for your PR attempt — you won't know how to brace into it. Spend 6–8 weeks training all working sets with the belt before testing. The exception: high-bar paused deficit pulls for hypertrophy can be done unbelted; the 1RM test itself almost always benefits from the belt.
What's a realistic monthly progression on the deadlift?
Depends on training age. Novice (under 1 year serious lifting): 10–20 lbs/month is normal — that's the 'newbie gains' window where Starting Strength and StrongLifts users add weight every session. Intermediate (1–3 years, 1RM 300–450 lbs): 5–10 lbs/month with intelligent programming. Advanced (3+ years, 1RM 450–600 lbs): 10–20 lbs per training cycle (8–12 weeks), so 1–2 lbs/week effective. Elite (1RM 600+): 5–15 lbs per cycle, sometimes negative cycles where you peak below estimated max. Hafthor went from 880 to 1,104 lbs over roughly 6 years of elite-level work — that's about 35 lbs per year at the absolute ceiling of human strength.
Does this calculator work for trap bar (hex bar) deadlifts?
The math works, but the numbers don't transfer to a barbell deadlift. Trap bar deadlifts typically allow 10–25% more weight than a straight-bar conventional pull because the handles sit at hip level (shorter range of motion) and the load is centered around your hips instead of in front of them (less lower-back demand). If your trap bar 1RM is 500 lbs, your straight-bar conventional 1RM is likely 400–445 lbs. Use the calculator for trap bar programming inside trap bar work — don't cross-apply.
I hit 405 × 5 last week. What 1RM should I attempt at my meet in 8 weeks?
Epley says 405 × 5 → 472 lbs. Brzycki says 455 lbs. Conservative meet planning: take the lower number as your projected 1RM, peak for 8 weeks (most peaks add 5–10% from your block-start estimate), and open at 90% of the peaked number. So: projected peak max ~480 lbs, opener at 432 lbs (round to 430 or 435 for plate math: 45 + 45 + 35 + 35 + 25 = 410, then add 10s to hit 430). Second attempt 455, third attempt 475–480. Always leave room for a tiny PR on attempt 3; never open at a number you haven't already pulled in the last 4 weeks.
Sources and references
- Stronger by Science — How to use 1RM calculators (Greg Nuckols)
- ExRx.net — Powerlifting Standards (deadlift strength classifications by bodyweight)
- USA Powerlifting (USAPL) — Technical Rulebook
- NIH National Library of Medicine — Prediction of One Repetition Maximum Strength from Multiple Repetition Maximum Testing (PubMed)