Estimated one-repetition maximum (1RM)
The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.
Free · No registration or payment
Calculation
Result
- Author-defined Epley / Brzycki average
- 115 kg
- Epley Formula (1985)
- 117 kg
- Brzycki Formula (1993)
- 113 kg
- Lombardi Formula (1989)
- 118 kg
- Wathan Formula (1994)
- 117 kg
- Mayhew et al. Formula (1992)
- 119 kg
- 100% 1RM
- 115 kg
- 95% 1RM
- 109 kg
- 90% 1RM
- 103 kg
- 85% 1RM
- 97 kg
- 80% 1RM
- 92 kg
- 75% 1RM
- 86 kg
The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
The result updates as you change the fields. Your data never leaves the browser.
Only upon clicking, current data is sent to generate the PDF and is not stored.
How it is calculated
The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.
Formula
Epley: w × (1 + r/30); Brzycki: w / (1.0278 − 0.0278 × r); Lombardi: w × r^0.10; Wathan: 100 × w / (48.8 + 53.8 × exp(−0.075 × r)); Mayhew: 100 × w / (52.2 + 41.9 × exp(−0.055 × r)). w: weight, kg; r: repetitions. At r = 1 all estimates equal w.
Limits of the method
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
Sources of the method
- LeSuer D.A. et al. The Accuracy of Prediction Equations for Estimating 1-RM Performance in the Bench Press, Squat, and Deadlift. J Strength Cond Res, 1997;11(4):211–213
- Brzycki M. Strength Testing—Predicting a One-Rep Max from Reps-to-Fatigue. JOHPERD, 1993;64(1):88–90
- Reynolds JM et al. Prediction of one repetition maximum strength from multiple repetition maximum testing and anthropometry. J Strength Cond Res, 2006
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
How to use the calculation
Enter the starting values
The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.
Adjust the parameters
Epley: w × (1 + r/30); Brzycki: w / (1.0278 − 0.0278 × r); Lombardi: w × r^0.10; Wathan: 100 × w / (48.8 + 53.8 × exp(−0.075 × r)); Mayhew: 100 × w / (52.2 + 41.9 × exp(−0.055 × r)). w: weight, kg; r: repetitions. At r = 1 all estimates equal w.
Read the result
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
Frequently asked questions
What does the calculation show?
The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.
What limitations apply?
Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.
Related calculators
Related tools.
Other calculators
Fitness and exercise physiology
- Circumference-based body composition and BMI
- Heart rate reserve zones
- Field estimates of VO2max
- Fat-free mass index (FFMI)
- Energy estimates from fat-free mass
- Historical reference body weight equations
- Waist indices WHR, WHtR and VAI
- Estimated sweat loss during exercise
- Casey Butt anthropometric model
- Powerlifting coefficients: DOTS, Wilks and IPF GL
- All calculators →
What next
Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.
Go to the knowledge base