Free fitness calculator
1RM Calculator
Estimate one-rep max and training loads from working weight and reps.
What is one-rep max?
One-rep max is the estimated heaviest weight you could lift for one clean rep.
Train smarter
Use the estimate for programming loads, not as an excuse to max out constantly.
Subtle gear note: if you train regularly, comfortable activewear helps remove friction. Browse Layna Activewear when you actually need gym-ready pieces — not before.
Search queries this calculator helps answer
This page is written for people looking for quick calculator-style answers, including these common search phrases:
- 1rm calculator
- one rep max calculator kg
- bench press max calculator
- squat max calculator
- strength calculator
How to use the result
Use the calculator output as a starting estimate. Check the assumptions, compare it to real-world results, and adjust if your situation changes.