Calculate your 1 rep max for free

An easy to use tool to calculate your theoretical 1 rep max. It will calculate this based on 2 to 15 reps and the weight lifted.

* Choose from 4 popular formulas

* Knowing your 1RM is great for planning your training program and great for motivation

* Percentages of your 1 rep max are given from 40% to 95% in 5% steps

* Easily share your latest lift with your trainer and friends using the share function

* Use imperial or metric units and the 1RM calculation is given in both lbs and Kgs

* Save any calculations you want to keep with your own description and a time stamp

Check out my full version with a built in plate calculator and ad free