One Rep Max Calculator
Estimated 1RM plus a full percentage training table.
Reviewed by the Calculation Machine team · How we check our maths
Your values
ⓘ Live results
Results
- Estimated 1RM
- 258 lb
- Epley formula
- 263 lb
- Brzycki formula
- 253 lb
| % of 1RM | Weight | Typical reps |
|---|---|---|
| 95% | 245 lb | 2 |
| 90% | 232 lb | 3 |
| 85% | 219 lb | 5 |
| 80% | 206 lb | 8 |
| 75% | 193 lb | 10 |
| 70% | 180 lb | 13 |
| 65% | 168 lb | 16 |
| 60% | 155 lb | 20 |
Quick answer
One rep max is the most weight you can lift once; the Epley formula estimates it as weight × (1 + reps/30).
The formula
1RM = weight × (1 + reps ÷ 30)
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- Weight lifted225 lb
- Reps completed5
Result
- Estimated 1RM258 lb
- Epley formula263 lb
- Brzycki formula253 lb
How to use the One Rep Max Calculator
- 1Enter the weight you lifted.
- 2Enter how many clean reps you completed.
- 3Use the table to set training percentages.
Frequently asked questions
How accurate is a 1RM estimate?
Very accurate at 3–5 reps, less so above 8, where technique and conditioning start to dominate.
Should I test my true 1RM?
Rarely — estimates from a heavy triple carry most of the information at a fraction of the injury risk.
About this calculator
- Built and reviewed by the Calculation Machine team · How we build and test calculators
- Report an error