Strength calculator
Rep Max Calculator
Turn any hard set into an estimated X-RM for any rep range.
Rep Max Calculator
Calculate your X-RM for any target rep range
What this does
Based on a sub-maximal set you performed, this calculates the maximum weight you can lift for a specific number of reps (your X-RM).
Example Use Case
You lifted 225 lbs for 5 reps at 2 RIR. You want to know your estimated 3-RM.
- • 5 reps at 2 RIR = 86.2% of 1RM
- • Estimated 1RM = 225 / 0.862 ≈ 260.9 lbs
- • 3 reps at 0 RIR = 95.2% of 1RM
- • Estimated 3-RM = 260.9 × 0.952 ≈ 248.4 lbs