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Bench Press One-Rep-Max Estimate — result sheet
Estimate a bench-press one-repetition maximum from a lifted load and completed repetitions using the Epley relation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Estimated 1RM = load×(1+repetitions/30).
The Epley relation is shown as a repeatable estimate rather than a guaranteed maximal performance value.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Lifted load — kg; minimum 1.0E-6; maximum 1000000
- Completed repetitions — minimum 1; maximum 30
Worked example
| Input | Value |
|---|---|
| Lifted load | 80 |
| Completed repetitions | 5 |
Estimated 1RM ≈ 93.33 kg.
Assumptions and limits
- Load is a positive mass and repetitions are whole numbers from 1 through 30.
- The repetitions are completed with consistent technique and range of motion.
- Spotting, injury risk, training prescription, fatigue, and actual maximum performance are not assessed.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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