Estimates only

One rep max formulas, percentage charts, RPE charts, warm-up plans and strength scores are based on published equations and averages. Your real results depend on your technique, experience, fatigue, health and many other things. Your true max can be higher or lower than any estimate.

Lift safely

• Use a spotter, safety pins or safety arms for heavy lifts.
• Warm up before heavy sets and stop if you feel pain.
• Beginners should not test a true one rep max.
• Speak to a doctor before heavy lifting if you have an injury, a heart condition, high blood pressure, are pregnant or have any other health concern.

Your responsibility

You use this site and its tools at your own risk. We work hard to keep everything accurate, but we cannot guarantee that every result is free of error. We are not responsible for any injury or loss that results from using the information on this site.

Links to other sites

We link to research papers and other sites so you can check our sources. We are not responsible for the content of those sites.

Questions

If something looks wrong, please contact us.