A 1 RM is the maximum poundage that can be lifted for one repetition. The 1 RM can be actual or theoretical. This calculator allows the theoretical max to be determined based upon a formula that uses multiple reps and the poundage used. This will allow you to determine and track a 1 RM without actually performing a one repetition max each time.
 

   Enter Reps Done
   Enter Poundage Used
 
 

1RM =