Calculated your estimated max lift for any exercise. Enter the weight and number of repetitions performed for an exercise and calculate your estimated one-rep max.

1rm Calculator

This calculator uses a simple formula based on current science to determine your max lift based on the same lift at a different rep number. The following is the percentage-based formula the calculator uses.

  • 1 Rep – 100% max lift
  • 2 Reps – 95% max lift
  • 3 reps – 93% max lift
  • 4 reps – 90% max lift
  • 5 reps – 87% max lift
  • 6 reps – 85% max lift
  • 7 reps – 83% max lift
  • 8 reps – 80% max lift
  • 9 reps – 77% max lift
  • 10 reps – 75% max lift
  • 11 reps – 73% max lift
  • 12 reps – 70% max lift

And so on…..

One Rep Max Calculator

Why would you need to know your max lift of any given exercise?

First, almost all lifting programs are based on your max lifts. Using your max lift numbers is used as a gauge to determine how much workload you can handle. Of course, this is only an estimation, but it’s still an essential first step in setting up a weight lifting program.

max lift calculator

Another good use of this calculator is to estimate where you are at for powerlifting competitions. More often than not, you don’t want to max out every lift every single week. This puts enormous strain on your body and leads to injury. Instead, most people go for reps or 3-5 for strength. When leading up to competition, powerlifters definitely don’t want to max out because they might get hurt. Instead, you can use this calculator to gauge where you are at and plan your competition lifts.

For more information on lifting, visit our bench press calculator.

For more related calculators, visit our health & fitness calculators.