Deadlift Max Calculator
Estimate deadlift one-rep max from weight and repetitions.
This deadlift max calculator estimates your one-rep max (1RM) for the deadlift from a submaximal set - the weight and number of reps you completed - using the Epley formula, a practical alternative to testing a true max directly.
Enter the weight lifted and reps completed, and the calculator returns your estimated deadlift 1RM.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 315 lbs for 5 reps | 1RM ≈ 367 lbs | 1RM = 315 × (1 + 5/30) = 315 × 1.1667 ≈ 367 lbs. |
| 405 lbs for 3 reps | 1RM = 445.5 lbs | 1RM = 405 × (1 + 3/30) = 405 × 1.1 = 445.5 lbs. |
The 1RM Estimation Formula
1RM = weight x (1 + reps/30), the Epley formula. Deadlifting 315 lbs for 5 reps estimates a 1RM of about 367 lbs (315 x (1 + 5/30)). Because the deadlift often allows for higher absolute loads than other lifts, small errors in rep counting can have a larger absolute impact on the estimated max.
Why Deadlift Max Estimates Can Vary More
Deadlift performance is particularly sensitive to technique, grip strength, and fatigue from other training that day, which can make 1RM estimates from a single submaximal set less consistent for the deadlift than for some other lifts - tracking trends over multiple sessions is often more informative than any single estimate.
How to Use the Deadlift Max Calculator
- Open the Deadlift Max Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the deadlift max calculator works.
Frequently Asked Questions
How do you estimate a deadlift one-rep max?
Use a formula like the Epley formula: 1RM = weight x (1 + reps/30), based on the weight and reps completed in a submaximal set, ideally in the 3-8 rep range for best accuracy.
Why might my estimated deadlift max feel inaccurate?
Deadlift performance is especially sensitive to grip strength, technique, and fatigue from earlier training, which can make single-set estimates less consistent than for other major lifts - tracking the trend over time is more reliable than any one estimate.
Should I test my deadlift max at the start or end of a workout?
Testing (or estimating from) a heavy set earlier in a workout, when you're not yet fatigued from other exercises, generally gives a more accurate reflection of true strength than testing after a long training session.
How do I use this deadlift max calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Deadlift Max Calculator calculate?
Estimate deadlift one-rep max from weight and repetitions. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this deadlift max use?
The formula is: 1RM = weight * (1 + reps / 30). Boyd Epley's 1980s formula was derived from data across multiple compound lifts, though strength coaches have long noted deadlift estimates tend to show more individual variation than bench press or squat estimates, likely because deadlift performance is unusually sensitive to grip strength and technique - factors the simple weight-and-reps formula can't directly account for.
Related Calculators
One-Rep Max Calculator
Estimate 1RM strength benchmark using Epley & Brzycki formulas.
Bench Press Max Calculator
Estimate bench press one-rep max from weight and repetitions.
Squat Max Calculator
Estimate squat one-rep max from weight and repetitions.
Pace Calculator
Calculate running pace, finish times, or required speed for races.
Body Fat Calculator
Estimate body fat percentage using US Navy tape measure method.
Macro Calculator
Calculate optimal protein, carb, and fat daily grams.
Last updated: September 27, 2026.