One Repition Maximum Calculator - Cast Iron Strength

One Repetition Maximum

Work out your predicted 1RM to help you gauge where your training is at or plan a new programme!

Weight

Reps

Your predicted 1 Reptition Maximum

10 Rep Max (75%)

8 Rep Max (78%)

6 Rep Max (83.5%)

4 Rep Max (88%)

3 Rep Max (91%)

2 Rep Max (95%)