Enter your deadlift weight and rep count to estimate your one rep max and see a full training percentage table. Works for conventional, sumo, and Romanian deadlifts, the formula applies to any variation where you are lifting a maximal load.
Exercise
Two formulas are used and averaged. The Epley formula (1985): 1RM = weight × (1 + 0.0333 × reps). The Brzycki formula (1993): 1RM = weight × 36 / (37 − reps). Both assume a near-maximal set of 1–12 reps. The percentage table divides the estimated 1RM by each percentage to give your working weight for that intensity zone. All arithmetic runs locally in your browser.
All calculations happen locally using pure JavaScript. Our servers are not involved at any point.
The Epley formula was published by Boyd Epley (1985) and remains the most widely used 1RM estimator in strength and conditioning. The Brzycki formula was published by Matt Brzycki in Strength & Conditioning Journal (1993). Both are population-average models with a standard error of approximately ±3–5 kg on sets of 3–5 reps. Accuracy decreases above 10 reps as aerobic capacity increasingly influences performance.
For estimating daily energy needs for a training plan, try the calorie calculator. To track fat-free mass between training blocks, use the lean body mass calculator. For setting cardio targets alongside strength work, see the heart rate calculator.