--- title: "One Rep Max Calculator | 1RM Strength Estimate Tool | XTRAW Tools" description: "Estimate one-rep max from weight lifted and reps using a free browser-based 1RM calculator from XTRAW Tools." url: "https://xtraw.com/tools/calculators/health-fitness-calculators/body-composition-calculators/one-rep-max-calculator" date: "2026-05-22T01:22:20+00:00" language: "en-GB" --- [TDEE Calculator](https://xtraw.com/tools/calculators/health-fitness-calculators/body-composition-calculators/tdee-calculator)[Calorie Calculator](https://xtraw.com/tools/calculators/health-fitness-calculators/body-composition-calculators/calorie-calculator) [![One Rep Max Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-one-rep-max-calculator-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-one-rep-max-calculator-360x360.jpg "One Rep Max Calculator from XTRAW Tools") popular [Back to: Body Composition Calculators](https://xtraw.com/tools/calculators/health-fitness-calculators/body-composition-calculators "Body Composition Calculators") # One Rep Max Calculator Estimate one-rep max strength from weight lifted and repetitions. Use this free browser-based one rep max calculator from XTRAW Tools. **One Rep Max Calculator** helps you estimate one-rep max strength from weight lifted and repetitions. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step. ## How to Use the One Rep Max Calculator 1. Enter the required calculator inputs shown in the form. 2. Review the measurement, date, time, activity, body, nutrition, or training assumptions. 3. Run the calculator, then adjust one input at a time to compare scenarios. ## What This Calculator Helps With Estimate one-rep max strength from weight lifted and repetitions. It is designed for lifters, strength athletes, gym users, personal trainers, and workout planners who want a fast, browser-based estimate before relying on a doctor, dietitian, trainer, coach, pregnancy care provider, public safety source, or other professional source. - Weight Lifted: 225 lb - Repetitions: 5 ## Common Uses People use this calculator when they need a quick way to estimate health, wellness, fitness, nutrition, timing, body composition, or training values from simple inputs. - **Health Estimate:** Create a quick wellness, fitness, nutrition, pregnancy, or body-measurement estimate from entered values. - **Measurement:** Use body, time, distance, nutrition, or training measurements to calculate a clear numeric result. ## Formula or Method Epley estimate: 1RM = Weight × (1 + Reps / 30) ## Example **Example inputs:** Weight Lifted: 225 lb; Repetitions: 5 **Example result:** Using the default inputs, estimated one-rep max is about 263 lb. ## Related Tools - [Workout Volume Calculator](https://xtraw.com/tools/workout-volume-calculator) - [Wilks Score Calculator](https://xtraw.com/tools/wilks-score-calculator) - [Dots Powerlifting Calculator](https://xtraw.com/tools/dots-powerlifting-calculator) - [Protein Calculator](https://xtraw.com/tools/protein-calculator) - [Lean Body Mass Calculator](https://xtraw.com/tools/lean-body-mass-calculator) - [Heart Rate Zone Calculator](https://xtraw.com/tools/heart-rate-zone-calculator) ## One Rep Max Calculator FAQ ### Is the One Rep Max Calculator free? Yes. This calculator is free to use on XTRAW Tools. ### Do I need to create an account? No. XTRAW tools are designed for browser-based use without requiring an account. ### Are the results exact? Results may be estimates depending on the inputs, formula, and purpose of the calculator. Always verify important results before relying on them. **Disclaimer:** This calculator is provided for general informational and convenience purposes only. It is not legal, financial, medical, tax, investment, insurance, accounting, pregnancy, health, fitness, nutrition, safety, or professional advice. 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