Mayhew Formula 1RM Calculator
The Mayhew formula uses an exponential curve, often cited as accurate for higher rep ranges.
100w ÷ (52.2 + 41.9 × e^(−0.055r)) — The Mayhew formula uses an exponential curve, often cited as accurate for higher rep ranges.
5 reps
One Rep Max
5 reps @ 225lb
268
lb
Mayhew formula
Big Four Strength Levels
Strength levels for a 200lb male, age 30 lifting 268lb in each lift type · enter your details.
Rep Max Projections
Mayhew algorithm
| Reps | Weight (lb) |
|---|---|
| 1RM | 268lb |
| 2RM | 240lb |
| 3RM | 235lb |
| 4RM | 230lb |
| 5RM(current) | 225lb |
| 6RM | 221lb |
| 7RM | 216lb |
| 8RM | 212lb |
| 9RM | 208lb |
| 10RM | 205lb |
| 20RM | 177lb |
Percentage Calculator
Based on 268lb estimated max
| Intensity | Weight (lb) |
|---|---|
| 100% | 268lb |
| 95% | 255lb |
| 90% | 241lb |
| 85% | 228lb |
| 80% | 214lb |
| 75% | 201lb |
| 70% | 188lb |
| 65% | 174lb |
| 60% | 161lb |
| 55% | 147lb |
| 50% | 134lb |
