1RM to Bodyweight Ratio Calculator
Use this one rep max calculator (1RM calculator) to estimate your 1RM from a weight and reps you've already lifted. Pick your lift to use it as a bench 1RM calculator, squat 1RM calculator, deadlift 1RM calculator, or overhead press 1RM calculator. We show estimated 1RM using Epley, Brzycki, and Lombardi formulas, plus a simple strength standard from your bodyweight ratio.
Shareable links save your inputs. Estimates only. Not medical advice.
One Rep Max (1RM) Calculator
Estimate your 1RM from reps and weight.
Enter the weight and reps you lifted. Add bodyweight to see a strength standard (novice to elite) based on your 1RM-to-bodyweight ratio.
Methods & assumptions
This variant focuses on 1RM to Bodyweight Ratio Calculator.
This tool estimates 1RM from a submax set (weight x reps). We calculate multiple formulas, round results to the nearest 2.5 lb or 1 kg, and compute relative strength as 1RM / bodyweight.
- Epley: 1RM = weight * (1 + reps / 30)
- Brzycki: 1RM = weight * (36 / (37 - reps))
- Lombardi: 1RM = weight * reps^0.10
Default display uses Epley. Your selected formula drives the bodyweight ratio and the novice/intermediate/advanced/elite label. Standards are heuristic for context only.
Example: bench press 225 lb for 5 reps -> ~262.5 lb 1RM (Epley).
Last updated February 3, 2026. Estimates only. Not medical advice. See editorial policy & methodology.
More variants
Focused on bench 1rm calculator.
Focused on squat 1rm calculator.
Focused on deadlift 1rm calculator.
Focused on Bench Press 1RM Calculator.
Focused on Overhead Press 1RM Calculator.
Focused on 1RM Calculator for 5 Reps / 8 Reps / 10 Reps.
Focused on Strength Standards Calculator (Novice to Advanced).
Questions & Answers
Clear answers, so you can use this tool with confidence.
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