One Rep Max Calculator
Understanding One Rep Max (1RM)
One Rep Max is the maximum weight you can lift for one repetition. It is used to program training intensity. Several formulas estimate 1RM from submaximal lifts.
Common Formulas
- Epley: 1RM = w × (1 + r/30)
- Brzycki: 1RM = w × 36/(37-r)
- Lombardi: 1RM = w × r^0.10
💡 Tips
- 1RM decreases with age
- Most accurate at low reps (1-5)
- Use 1RM percentages for training
- Test 1RM safely with a spotter