Health & Fitness Tools / One-Rep Max Calculator
One-Rep Max Calculator
Estimate your one-rep max (1RM) from any weight and rep count.
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One-Rep Max Calculator
Estimate your one-rep max (1RM) from any weight and rep count.
Features
- Uses the Epley formula
- Full percentage breakdown table (70-95%)
- Works with any weight unit
- 100% free, no signup
How to Use
Step 1
Enter the weight you lifted.
Step 2
Enter how many reps you completed.
Step 3
Click Calculate 1RM to see your estimate and percentage table.
About This Tool
One-Rep Max Calculator estimates your one-rep max using the Epley formula from any weight and rep range, and shows a full percentage table for programming your training loads.
Frequently Asked Questions
How accurate is an estimated 1RM?
It is a solid estimate for planning purposes, but true 1RM testing can vary from formula predictions, especially at very high or low rep counts.
What is the percentage table for?
It shows common training percentages of your 1RM, useful for programming sets at specific intensities.