Enter the weight you lifted and the number of reps completed to estimate your deadlift one-rep max (1RM). Choose your preferred unit (lbs or kg) and the calculator returns your estimated 1RM, plus a full rep percentage breakdown showing target weights for every rep range from 1 to 10.
Estimated 1RM
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2-Rep Max (97%)
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3-Rep Max (94%)
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5-Rep Max (89%)
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8-Rep Max (81%)
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10-Rep Max (75%)
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Your one-rep max (1RM) is the maximum amount of weight you can lift for a single complete repetition with proper form. For the deadlift, it's the heaviest load you can pull from the floor to a full lockout just once. It's a key benchmark used to gauge absolute strength and to set training loads.
This calculator uses the Epley formula: 1RM = Weight × (1 + Reps / 30). It's one of the most widely used and validated formulas for estimating one-rep max from submaximal sets. Results are most accurate when the rep count is between 2 and 10.
The estimate is a reliable approximation, especially when the input set is performed near failure with 2–10 reps. Accuracy decreases with higher rep counts (15+), fatigue, or sets that weren't taken close to failure. Always treat the result as an informed estimate rather than a guaranteed max.
Once you know your estimated 1RM, you can set training loads as a percentage of it. For example, working at 85–90% targets maximal strength, 70–80% builds hypertrophy, and 60–70% develops muscular endurance. Many strength programs like 5/3/1 are built entirely around percentages of your 1RM.
Testing a true 1RM should only be done after a proper warm-up, with spotters or safety equipment where possible, and by lifters who have solid technique. Using a submaximal set and this calculator is a safer approach for most people, especially beginners or those returning from injury.
Use whichever unit matches how you load your barbell. The calculator accepts both — just make sure the weight you enter and the unit you select match. The 1RM result will be displayed in the same unit you chose.
Each lift recruits different muscle groups and relies on different mechanics, so your strength ceiling varies across exercises. Your deadlift 1RM reflects posterior chain and hip hinge strength, which may be quite different from your quad-dominant squat or horizontal-press bench press numbers.
The most accurate estimates come from sets of 2–5 reps taken close to failure. As the rep count rises above 10, the relationship between submaximal effort and true 1RM becomes less predictable, and the formula tends to slightly overestimate your max.