Estimate your one-rep max (1RM) for any lift based on the weight and reps you can currently perform.
| 1RM (Epley Formula) | |
| 1RM (Brzycki Formula) |
Your one-rep max (1RM) is the heaviest weight you could lift for a single rep with proper form. Rather than testing this directly (which carries injury risk), this calculator estimates it from a weight and rep count you've already lifted, using standard strength-training formulas.
Example: lifting 100 lbs for 5 reps estimates a one-rep max — useful for programming training percentages (e.g. "work at 80% of your 1RM") without needing to actually max out.
This calculator uses two well-known formulas - Epley and Brzycki - to estimate your one-rep max from a submaximal set. It also shows a percentage breakdown table (50-100% of your estimated 1RM) useful for programming training weights.
One-rep max is the maximum weight you can lift for a single repetition of a given exercise.
It uses two well-known formulas, Epley and Brzycki, to estimate your one-rep max from a submaximal set.
You enter the weight and reps you can currently perform for a given lift, and the calculator estimates your 1RM from that submaximal set.
It shows a percentage breakdown table from 50-100% of your estimated 1RM, useful for programming training weights.
Yes, you can estimate your one-rep max for any lift based on the weight and reps you can currently perform.