Bench Press Calculator
Use the Bench Press Calculator for a transparent, instant calculation with validated inputs and cited sources. For a query such as “bench calculator”, enter the matching values and units below and review the stated assumptions.
How to use this calculator
Enter the requested values and units.
Review the assumptions and any warnings shown with the result.
Use the result together with the cited source and your real-world requirements.
Formula
For one repetition, estimated1RM = liftedWeight. For 2–10 near-failure repetitions, use estimated1RM = liftedWeight × (1 + reps ÷ 30).
Worked example
Worked example: Inputs: Weight lifted: 100 lb or kg; Near-failure repetitions completed: 5. Outputs: Estimated one-repetition maximum: 116.6666666667 same weight unit.
Assumptions and limits
- The result depends on the values, units, and assumptions entered. It does not infer missing context.
Sources
- National Library of Medicine, PubMed Central: Comparison of repetition-to-failure 1RM prediction equationsReference material reviewed for the stated method, units, or domain. Confirm that its scope matches your use case. Reviewed 2026-08-14.
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Verification
How this calculator is checked
Trust comes from reproducible evidence, not model confidence. You can inspect the formula, assumptions, worked example, and cited sources on this page.
- Versioned calculationFormula logic is kept separate from the interface and covered by automated registry and behavior checks.
- Cited evidenceSources linked for independent checking: 1.
- Transparent AI useAI may assist drafting or adversarial review. Agreement between models is not proof, and no human expert review is claimed unless a named reviewer is shown.
Frequently asked questions
How does the Bench Press Calculator work?
For one repetition, estimated1RM = liftedWeight. For 2–10 near-failure repetitions, use estimated1RM = liftedWeight × (1 + reps ÷ 30).
What should I enter?
Weight lifted, Near-failure repetitions completed
What should I verify?
Review the assumptions and any warnings shown with the result. The result depends on the values, units, and assumptions entered. It does not infer missing context.
Last updated 2026-08-25 · lifestyle-bench-press-v2 · opportunity-source-2026-08-24 · Published by YunFanLabs