One Rep Max Calculator

📊 Training Load Chart

📖 About One Rep Max Calculator

The One Rep Max (1RM) Calculator estimates the maximum weight you could lift for a single repetition based on a set you've actually performed. It uses three proven formulas — Epley, Brzycki, and Lander — and averages them for the most accurate estimate. The training load chart shows what percentage of your 1RM to use for different rep ranges, following established strength training principles. Perfect for powerlifters, bodybuilders, CrossFit athletes, and anyone following a percentage-based training program. All calculations are instant and private — nothing is stored or sent anywhere. For maximum accuracy, use a weight you can lift for 1-10 reps. Above 10 reps, all formulas become less reliable. The training load chart follows standard periodization principles used by strength coaches worldwide.

How to Use

1. Enter weight — The weight you lifted (kg or lbs).
2. Enter reps — How many reps you completed.
3. Read your 1RM — Estimated max from 3 formulas.
4. Use the chart — Find training weights for any rep range.