Free one rep max calculator online

Enter a load and 1–12 repetitions. Get an Epley estimate and training-load table immediately, without an account.

Free, no credit card General estimate, not medical advice or a real maximum-strength test.

Tool available

Estimate your 1RM

Use a technically consistent set near effort without attempting a true maximum.

Exercise Load lifted Unit Repetitions completed Available plate increment Set date

Free, no credit card

Epley estimate —

Training loads calculated from estimated 1RM
Intensity	Rounded load

The calculation is free. An account is required only to keep this result and retrieve it later.

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Method and assumptions

Nalko applies Epley: load × (1 + repetitions ÷ 30). The app uses the same method when comparing sets.

Training loads are rounded to the selected increment. The result does not tell you to attempt that load.

Important limitations

Exercise, range of motion, technique, fatigue and proximity to failure all affect the estimate.
Prediction becomes less stable as repetitions rise, so the input is limited to 12.
A real maximum test requires appropriate equipment, safeties and possibly qualified supervision.

2026-07-26

FAQ

Which formula does this 1RM calculator use?

Epley: load × (1 + repetitions ÷ 30). The saved record includes the method version.

Do I need an account to calculate one rep max?

No. The estimate and table are free without an account. Sign in only to save an exercise and see history.

Should I attempt the maximum load shown?

No. Treat it as a programming estimate, not an instruction to test a true maximum.