Health & Fitness
One-Rep Max Calculator
Estimate one-repetition maximum from a completed set using the Epley equation.
Preparing your result…
What this calculator does
Calculates One-Rep Max Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
1RM = weight × (1 + reps ÷ 30)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Epley estimated 1RM=lifted load×(1+completed repetitions/30). Load and result use the same unit. This is an estimate from a repetition-to-fatigue set, not an actual maximal lift.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Require positive load and positive integer repetitions; avoid extrapolation to high-repetition sets. If one completed repetition is treated as a measured 1RM, return the load explicitly: the Epley extrapolation at r=1 otherwise gives 1.033×load. Exercise and population affect error.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Lifted weight (kg) | Repetitions (reps) | Estimated one-rep max |
|---|---|---|---|
| Worked example | 60 | 8 | 76 kg |
| Half the amounts | 30 | 8 | 38 kg |
| Double the amounts | 120 | 8 | 152 kg |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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