One Rep Max (1RM) Calculator
Calculate your one-rep max with our 1RM calculator’s fourteen formulas or for improved accuracy try our specialized calculators for Bench Press, Squat, and Deadlift.
Estimated 1RM:
| % of 1RM | Weight | Reps |
|---|
Recommended Formulas
- General: Baechle or Wathen (2-10 reps)
- Bench Press: Brzycki or Mayhew (6-12 reps)
- Squat: Brzycki or Wathen (3-12 reps)
- Deadlift: Epley or Wathen (5-10 reps)
- Over 10 reps: Desgorces or Mayhew (10-20 reps)
Having trouble deciding which formula to use? Check out our 1RM formulas guide for more information or try our 1RM calculators tailored specifically for Bench Press, Deadlift, and Squat. Our one rep max calculator has a lot of 1RM formulas to choose from, but selecting the right one can be a challenge as each of the formulas offers unique pros and cons for different lifts and rep ranges, and they vary widely in their predictions, as shown below.
Not sure where to begin? Visit our 1RM overview to get started and then learn how to test your 1RM safely. Warming up, using a spotter, and increasing weight gradually are key. Be aware that while our one-rep max calculators provide accurate estimates, these are still approximations and your actual 1RM may differ due to personal factors like training experience and form, so always prioritize safety when attempting max lifts.
Check out our fitness guides for the history of 1RM formulas and tips for increasing your one-rep max.