Free Online Tools
One Rep Max Calculator
Calculate your one rep max, based on your max reps.

Enter your lifted weight in LB or KG, and repetitions, to calculate your one rep max weight.

Update the above form, to update the result.

Your one rep max is: _ LB

Frequently Asked Questions
What is a 1-rep max?
A 1-repetition max (1-RM) is the absolute maximum amount that can be lifted for one rep for any given exercise.
Does everyone needs to know their 1-RM?
Not necessarily. While knowing 1-RMs can be useful for intermediate and advanced lifters to provide accuracy for programming, beginners don't necessarily need to know their true 1-rep max strength.