Tools · 01
One-rep max calculator.
Enter a set you actually completed. The calculator estimates your max two ways and turns it into working percentages. No sign-up, no guessing.
1RM calculator
Estimated one-rep max
262.5lb
Epley 262.5 lb · Brzycki 253.1 lb
Working loads from your estimate
| % of 1RM | Load | |
|---|---|---|
| 95% | 250 lb | |
| 90% | 235 lb | |
| 85% | 225 lb | |
| 80% | 210 lb | |
| 75% | 195 lb | |
| 70% | 185 lb | |
| 65% | 170 lb | |
| 60% | 160 lb |
Rounded to the nearest 5 lb. Estimates only — ask a coach before maxing out.
Reading the number
A map, not a medal.
A calculated max is a planning tool. It helps you pick loads for a strength block without testing a true single every week. It is not proof of what you can lift on a given day.
Ask a coach to program from it →Reps 1–12 only
The formulas get less reliable as reps climb. Past 12, the estimate says more about your conditioning than your strength. Keep the input in the range.
Two formulas, one range
Epley and Brzycki rarely agree to the pound. Treat the two numbers as a range. If they are far apart, the set was probably outside the useful rep range.
Percentages are for planning
The table rounds to the nearest 5 lb or 2.5 kg so you can load it. Use it for working sets, not for an ego single. Ask a coach before maxing out.
Other tools
Keep going.
Put it in a program
A number needs a plan.
Bring your estimate to a coaching session. A coach can check your form and build the block around the number.