One Rep Max Calculator
Estimate your 1RM, training percentages and strength-to-bodyweight ratio from weight lifted and reps
Hit Calculate to see your result
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Use estimated 1RM to choose training loads while keeping technique, spotters and recovery in mind.
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Test how a different rep set would change your estimated 1RM.
Calculate your baseline first
The default DEX average blends Epley, Brzycki, Lombardi and O'Conner estimates. You can also select each formula individually to compare results.
Estimates are usually more reliable from lower-rep sets, especially 1–8 clean reps. Higher-rep sets depend more on endurance and can over- or under-estimate maximal strength.
Use 90–95% for heavy singles, 80–85% for strength work, 70–75% for volume, and 50–65% for warm-ups, speed work or technique practice. Adjust for fatigue and exercise difficulty.
Results are estimates generated locally in your browser from common 1RM equations. They are for informational and training-planning purposes only, not coaching, medical or injury-prevention advice. Max attempts can be risky; use proper technique, equipment, spotters and professional guidance where appropriate. VisionVix accepts no liability for decisions based on this output.
