Your max deadlift is the heaviest weight you can pull from the floor to a standing lockout for a single clean rep. This deadlift max calculator estimates that number from any set you have already done: enter the weight and reps below and it returns predictions from six proven formulas, a reliability band that shows how much those formulas disagree, an RPE adjustment for how hard the set felt, the reps you would need to reach a goal weight, and the plates you would load on the bar. Pair it with the 1RM Calculator for the other lifts and the bench press calculator for your pressing loads.
A deadlift 1RM calculator is only as useful as the honesty behind it. The deadlift is the least cooperative of the big three lifts for estimate formulas: research consistently finds prediction equations underestimate a true deadlift max, the gap between a reset-from-the-floor rep and a touch-and-go rep is real, and a double-overhand grip usually fails before your back does. This page does not hide any of that in fine print. It shows you the full spread between the formulas, tells you when to trust the number and when not to, and refuses to invent fixed conversions between deadlift styles or pieces of equipment. Bill Starr treated the deadlift as a once-a-week lift that never needs to be complicated; for the framework, see Bill Starr's 5x5 Program.
Deadlift Max Calculator
Estimate your conventional deadlift max (1RM) from any set you have pulled recently.
Estimated max deadlift (1RM)
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Formula comparison
| Formula | Estimated 1RM |
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1RM percentage chart
| % of 1RM | Weight (lb) | Typical rep range |
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Training max
Estimated training max: —
A training max is a programming number (by default 90% of your 1RM), not the same as a tested one-rep max. In a Bill Starr-derived week the deadlift is usually pulled once, with a modest number of heavy working sets, so honesty about the top number matters more than chasing a single heavier rep.
Estimated rep maxes
Advanced options
RPE adjuster
Rate-of-perceived-exertion (RPE) adjusts the estimate when a deadlift set was harder or easier than maximal. RPE 10 is maximal, RPE 9 leaves about 1 rep in reserve, RPE 8 about 2. Because RPE is subjective, the result is a rough estimate, not a precise number.
RPE-adjusted 1RM estimate: —
Reverse deadlift calculator
Pick a target max deadlift and a set weight to see roughly how many reps that weight would need to reach the target - e.g. "how many reps of 315 lb to deadlift 405?"
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Bodyweight strength ratio (optional)
Enter your bodyweight and the calculator adds a line to the result card showing your estimated max deadlift relative to bodyweight (e.g. "about 2.2x your bodyweight"). It is pure arithmetic - a strength comparison, not a claim about what is "good" for your weight.
Plate loader
See which plates go on each side of a standard 45 lb (20 kg) bar to reach a target deadlift weight.
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Deadlift staples to remember: 225 lb = bar + 2 x 45 lb per side; 315 lb = bar + 3 x 45 lb per side; 405 lb = bar + 4 x 45 lb per side; 495 lb = bar + 5 x 45 lb per side. Load both sides evenly, then reset your starting position for every rep.
How the Deadlift Max Calculator Works
A deadlift calculator takes the weight you pulled, the number of reps you completed, and applies a formula that extrapolates to a single maximum rep. The logic is simple: the more reps you do with a given weight, the lighter that weight is relative to your true max deadlift, so the higher the estimate climbs. The assumption the whole thing rests on is that you rest each rep on the floor and reset your position, the way a deadlift rep is supposed to be done.
For example, 315 lb x 5 estimates a max deadlift of roughly 355-370 lb. The same weight at 315 lb x 3 estimates about 335-350 lb, and 225 lb x 5 estimates a max deadlift of roughly 255-265 lb. That relationship is what the well-known 1RM formulas encode, and it is why estimating a deadlift max from a hard but honest set is far more practical than risking a heavy single on a tired lower back.
The Six Formulas
| Formula | Idea behind it |
|---|---|
| Epley | The most common default: add one-thirtieth of the weight for each rep over one. |
| Brzycki | Developed for collegiate athletes; tends to estimate lower for higher reps, which can be more conservative. |
| Lombardi | Uses reps raised to a fractional power, estimating slightly higher as reps climb. |
| O'Conner et al. | Similar structure to Epley with a gentler slope, common in fitness-testing literature. |
| Wathan | An exponential model fitted on a bench press sample, included here for comparison rather than as a deadlift-specific claim. |
| NASM | Published by the National Academy of Sports Medicine: weight + (weight × reps ÷ 30.48). Nearly identical to Epley with a slightly larger rep constant. |
Because each formula was built from different data, they disagree by a few percent. The calculator highlights Epley as the common default and averages all six so you get one working number without pretending any single formula is perfect.
The Reliability Band
A single number is the friendliest output, but it hides the truth: no estimate formula is precise, least of all for the deadlift. This deadlift 1rm calculator therefore prints a reliability band on the result card - the lowest and highest of the six formulas plus the spread between them. A heavy set of three gives you a tight band you can plan around. A set of twelve produces a wide band, which is the calculator telling you outright that the number is soft. That visible uncertainty is the honest part of the setup.
There is one more deadlift-specific wrinkle. In the study most often cited on the subject (LeSuer et al., 1997), prediction equations tended to underestimate deadlift 1RM, where they overestimated in the bench press and squat. In practice that means a fresh, well-grooved deadlift max often lands toward the upper end of the band. The reliability band line on this page says exactly that in the calculator's own words.
Why the Result Is an Estimate
Every rep-max formula produces an estimate, not a measurement, and the deadlift adds failure points the other sports rarely tax. The biggest variables are: whether every rep is reset on the floor or bounced through touch-and-go (touch-and-go inflates estimates against a judged lift), how fresh your lower back is (a heavy deadlift the day after a 5x5 squat day is a different exercise), how much you fight to keep your trunk rigid in the first inches off the floor, and how far your grip lets you go at all. If any of those is off, the set you enter into a squat or bench calculator hides the error; the deadlift advertises it. Keep the variables honest and the estimate is useful; fix nothing else and no formula will save you.
Deadlift Variations: Conventional, Sumo, Trap Bar, and Romanian
The conventional deadlift, the sumo deadlift, the trap-bar deadlift, and the Romanian deadlift are separate lifts, not interchangeable versions of the same pull. Sumo widens the stance, turns the toes out, and lowers the hips, so one lifter's proportions can make sumo the heavier lift while another is stronger conventional. The trap bar moves the hands beside the hips and straightens the torso, and most lifters can handle somewhat more on it. The Romanian deadlift starts from the top, loads the hamstrings, and is a hip-hinge exercise rather than a max-testing pull at all.
The exact differences vary a lot from person to person, so this page does not apply a fixed percentage between any of them, and it does not print "good, great, elite" bodyweight bands. There is no reliable universal conversion or standard; pretending there is would produce wrong numbers. The honest approach is to treat each variation as its own lift, estimate its max from its own set with this same calculator, and train the conventional pull as the sport lift it is. Bill Starr's own writing on the lift - rules, grip, and the one-set approach - lives in the deadlift articles.
Grip, Belt, and Equipment
A double-overhand grip is the classic limiting factor on the deadlift: on heavy pulls the hands let go before the back does, and the set ends not because the lift failed but because the grip failed. If that happens to you, the fix is coaching, not math. Switch to a mixed (alternate) or hook grip for max attempts, or use straps for higher-rep working sets, and the calculator's output stays exactly the same - it never adds or subtracts a phantom percentage for grip style.
A belt is equipment, not a variable. Some lifters brace harder and pull a little more with one; others find it gets in the way. Use it if it feels right and you actually push your trunk against it; skip it if it does not. The belt does not change your calculated number, and neither does wearing a different pair of shoes for the pull. What changes the estimate is changing how the reps were done - reset between reps, no hitch, no hitching the bar up the thighs - so log your sets honestly and the number stays trustworthy.
RPE and Reps in Reserve
RPE (rate of perceived exertion) tells you how hard a set felt: 10 means maximal effort, 9 leaves about one rep in reserve, and 8 leaves roughly two. The RPE adjuster rebuilds your deadlift estimation from your actual reps plus the reserve reps you left in the tank. Because the deadlift grinds the lower back and nervous system harder than any other lift, most working sets belong in the RPE 8-9 range - heavy enough to drive strength, light enough that you leave the gym able to recover for the next session. And because RPE is subjective, treat the adjusted result as a directional number, not a measurement.
Training Max and the Bill Starr Deadlift Day
A training max is a programming number, by default 90% of your estimated 1RM, that you progress against without grinding into the ground. In a Bill Starr-derived week the deadlift is pulled once, with a small number of heavy working sets - in many Starr-style plans a single work set of five. The working weight is one you can handle for honest reps pulled from the floor with a reset each time, and that +5 to +10 lb push week to week happens against the training max, not against endless near-max singles. The deadlift's job in the program is to make the bar move when it has to, and it only has to once a week. For the broader framework of setting your numbers, see the 5x5 Workout Calculator.
The Percentage Chart
The percentage table under your result shows what weights to handle for different rep ranges: 70% of your 1RM typically lands around 8-10 reps, 80% around five, and 90% around two or three. On the deadlift specifically, keep the higher-rep percentages as occasionally-scheduled back-off volume rather than a weekly habit; the lift rewards heavy, low-rep honesty more than accumulating chafe-inducing volume. The chart is the bridge between knowing a realistic max deadlift and structuring the workout that improves it.
Frequently Asked Questions
What is a deadlift one rep max (1RM)?
Your deadlift 1RM is the heaviest weight you can lift from the floor to a standing lockout in one clean rep, with a reset to the floor between reps and no hitching or letting go. It is specific to the deadlift, so it differs from your squat, bench press, or overhead press max. Entering a heavy set into this calculator estimates it without risking a full-max pull.
How do I calculate my max deadlift without testing it?
Pull a weight you can handle for a few solid reps with a reset between each one, record the weight and reps, and enter both into the calculator. Each formula estimates the 1RM from that set and the average of all six is your working number. For example, 405 lb for 3 clean reps estimates a max deadlift of roughly 430 to 450 lb.
Which formula is most accurate for the deadlift?
No formula is universally the most accurate; each was fitted to a different data set. In the 1 to 10 rep range, Epley and Brzycki perform well in most comparisons, and averaging several formulas reduces error. Research on the deadlift (LeSuer et al., 1997) found prediction equations tend to underestimate a true max, so your real deadlift is often a little higher than the average. Use the average as a conservative working number and expect a tested max to sit toward the upper end of the reliability band.
How many reps of 225 lb do I need to deadlift 315?
About 12 reps of 225 lb estimates a 315 lb max deadlift with the Epley formula (225 x (1 + 12 / 30) = 315). A twelve-rep deadlift set is demanding by itself, so a heavier set of five is a more practical way to estimate the same target.
How many reps of 315 lb do I need to deadlift 405?
About 8 to 9 reps of 315 lb estimates a 405 lb max deadlift with the Epley formula (315 x (1 + 9 / 30) = 409.5). A set of eight or nine with 315 lb is a heavy session on its own; many lifters instead build to a strong single or a double and let the formula interpolate.
How many reps of 405 lb do I need to deadlift 495?
About 7 reps of 405 lb estimates a 495 lb max deadlift with the Epley formula (405 x (1 + 7 / 30) = 499.5). Beyond a few heavy reps, estimates get less reliable, so treat the result as a ballpark rather than a promise.
Why does the deadlift estimate vary so much between formulas?
The six formulas were built from different training populations and use different mathematics, so they disagree by a few percent, and the gap widens as reps climb. This page shows the full spread as a reliability band instead of hiding it. A heavy low-rep set produces a narrow band you can trust; a high-rep set produces a wide band, which is the calculator telling you to trust the number less.
Is sumo deadlift heavier than conventional?
Sumo and conventional are separate lifts, not two ways of doing the same pull. Sumo changes the stance, the toe angle, and where the hips sit, so it can suit one lifter's proportions so well that they pull more there, while another pulls more conventional. The difference is individual and no reliable fixed percentage exists, so this calculator does not convert between them. Estimate each style from its own set.
Can I use my deadlift calculator number for the trap bar?
The trap bar, with the hands beside the hips and a more upright torso, is effectively a different lift from a straight-bar deadlift, and many lifters can handle somewhat more on it. But the exact difference is individual, so no reliable fixed percentage exists, and this page will not invent one. Treat the trap bar and the straight bar as separate numbers.
Is my grip holding back my deadlift?
Sometimes. A double-overhand grip is usually the first thing to fail on a heavy deadlift: the hands give out before the back. If the bar slips or your forearms fatigue before your pull feels topped out, switch to a mixed (alternate) or hook grip, or use lifting straps for working sets. Grip choice is coaching, not a calculator variable, and it does not change your estimated 1RM.
Do I need a belt to deadlift?
No. A belt is equipment, not a requirement, and it does not change the calculated number. A belt can help some lifters brace harder and pull a little more; for others it gets in the way. Use one if it feels right and you brace against it properly, and skip it if it does not. Set your back into a tight trunk either way, because that is what protects your lower back.
How often should I deadlift?
Most plans pull once a week, and Bill Starr's programming was no exception. The deadlift is the single most taxing lift on the lower back, so it is typically scheduled once a week with a small number of heavy work sets: in many Starr-style plans a single work set of five. That low frequency is deliberate: the posterior chain is already heavily involved in squats, rows, and good mornings. A once-a-week deadlift that is heavy, honest, and reset from the floor on every rep will out-progress a twice-a-week grind.
Related Articles
- 1RM Calculator: Estimate Your One Rep Max
- Bench Press Calculator: Estimate Your 1RM
- Squat Max Calculator: Estimate Your 1RM
- The Deadlift, Part 1 by Bill Starr
- Bill Starr's 5x5 Program: The Original 5 Sets of 5
- 5x5 Workout Calculator: Plan Your Bill Starr Working Weights
- Stronglifts 5x5 vs. Bill Starr 5x5: What's Different?
- 5x5 Workout: The Complete Beginner's Guide to Strength Training
- The Starr Rehab Protocol for the Lower Back
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