How do I calculate my deadlift 1RM?

Enter the weight you lifted and the number of reps completed. The calculator uses six validated prediction formulas and averages them for the most reliable estimate. For best accuracy, use a set of 1–5 reps.

What is a good deadlift 1RM?

Relative to body weight: beginners typically deadlift around 1× bodyweight, intermediates around 2×, and advanced lifters 2.5×+. These benchmarks vary by sex, age, and training history.

How does sumo compare to conventional?

On average, sumo deadlift is about 97% of conventional for most lifters. This is a population average — individual ratios vary based on limb proportions, hip mobility, and training emphasis.

Why is the trap bar deadlift higher?

The trap bar places the load closer to your center of gravity, allowing a more upright torso. This mechanical advantage typically results in about 10% higher loads compared to conventional, making it a popular choice for athletes.

Deadlift 1RM Calculator

Name: Deadlift One Rep Max Calculator
Author: Manish Kumar

Key Takeaways

Six validated formulas (Epley, Brzycki, Lombardi, Mayhew, Wathen, O'Conner) estimate your deadlift 1RM from a submaximal set — the average of all six provides the most robust estimate.^[1]
Variant conversion factors let you compare conventional, sumo, and trap bar deadlift estimates based on population data.^[2]
Strength standards based on bodyweight ratio provide context for your deadlift relative to population benchmarks.
All estimates become less reliable above 10 reps. Use sets of 1–5 for the most accurate 1RM predictions.

Deadlift Variant Considerations

Conventional

Standard deadlift with narrow stance. Reference point for strength standards. Emphasizes posterior chain and lower back.

Sumo

Wide stance with hands inside knees. Typically ~97% of conventional for most lifters. Shorter range of motion, more hip/adductor emphasis.^[2]

Trap Bar (Hex Bar)

Center-loaded, more upright torso. Typically ~110% of conventional due to mechanical advantage. Popular for athletic training.^[3]

Limitations

Prediction accuracy decreases as reps increase — sets above 10 reps produce less reliable estimates.
Variant conversion factors are population averages — individual leverages, limb proportions, and training history affect actual ratios.
Strength standards are approximate population benchmarks, not competition classifications.
Grip type (mixed, hook, straps) can affect performance but is not factored into the estimate.
This tool is for informational and journaling purposes only. It does not constitute personalized advice.

Frequently Asked Questions

Sources & References

Prediction of one repetition maximum strength from multiple repetition maximum testing and anthropometry. LeSuer DA, et al.. J Strength Cond Res (1997)
A comparison of the sumo and conventional deadlift. Various. PMC (2024)
Trap bar deadlift biomechanics. Various. ScienceDirect (2024)

Manish Kumar

Certified Personal Trainer & Sports Nutritionist

NASM-CPTCertified Sports Nutritionist10+ Years Experience500+ Clients Coached

NASM-certified fitness and nutrition coach with over 10 years of hands-on experience helping people build strength, lose fat, and live healthier lives. Specializing in gym-based workouts with a strong focus on lifting technique, biomechanics, and practical exercise science. Through FitLifeRegime, sharing the tools, tips, and insights that have worked for hundreds of clients — helping you start your own fitness journey with confidence and clarity.

Learn more about Manish

NASM Certified

Certified Personal Trainer & Sports Nutritionist from the National Academy of Sports Medicine

This tool is for informational and journaling purposes only.

I am NOT a doctor.

Deadlift One Rep Max Calculator