Our Mission
LiftMath provides free, evidence-based calculators for strength training enthusiasts. Our tools are designed to help powerlifters, bodybuilders, and general fitness enthusiasts make informed training decisions using scientifically-backed methods.
Why We Built This RPE Calculator
Rate of Perceived Exertion (RPE) has become an essential tool in modern strength training. However, many calculators online are inaccurate, poorly designed, or missing key features. We built this calculator to provide:
- Accurate calculations based on the respected Helms RPE chart
- Clean, intuitive interface that works on all devices
- Comprehensive training load recommendations
- Support for both metric and imperial units
- Free access with no ads or paywalls
About the Helms RPE Chart
Our calculator uses the Helms RPE chart, which is widely respected in the strength training community. This chart was developed through extensive research and practical application in powerlifting and strength sports, providing reliable estimates for training load percentages across different rep ranges and RPE levels.
Contact
Have feedback or suggestions? We'd love to hear from you. This tool is constantly being improved based on user feedback from the strength training community.
Disclaimer: This calculator is for educational and training planning purposes. Always consult with qualified coaches and medical professionals for personalized training advice.