Health & Fitness CalculatorsPrivate by design
One-Rep Max Calculator
Enter the weight you lifted and how many reps you completed to estimate your one-rep max, plus a table of training weights at common percentages.
How to use this tool
- 1Enter the weight you lifted.
- 2Enter how many reps you completed.
- 3See your estimated 1RM and a percentage-based training table.
Frequently asked questions
How accurate is an estimated 1RM?+
The Epley formula used here is a widely-used estimate, most accurate for rep ranges under about 10 — true 1RM testing involves some individual variation.
Related tools
Keep the boring tools boring.
If this saved you five minutes of nonsense, you can help keep the free tools running.
Buy the toolbox a coffee