One Rep Max (1RM) Calculator

Estimate 1RM using the Epley and Brzycki formulas from weight lifted and reps.


          

        


        
How to use

          
    
            
  1. Enter the weight you lifted for a given number of reps (preferably under 10 reps).
    2. 
            
  2. Click Estimate 1RM to see Epley and Brzycki estimates.
    3. 
          

          
Note: These are estimates and may vary per individual.