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Predicting Your One Rep Max Predicting Your One Rep Max
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Predicting Your One Rep Max!

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Claculate Your 1 rep max for designing your routines!

Last updated on October 10, 2019

Do you want to find out how strong you are? Sure we all do. Need to know what your one rep max is for a new workout program based on percentages? It is simple! Use the following calculator and table to figure it out. Of course, this is only an estimate. Your actual one rep max could be higher or lower! (Hopefully higher!)

This second method is based on a formula comes from A Practical Approach to Strength Training by Matt Brzycki. Just do a set to failure on any exercise, then enter in how much weight you did and how many reps you finished (without help) into the form below.

Calculator 1

Predicting Your One-Rep Max

Weight Lifted

Reps Done (1-10)

One-rep max
50% 1 RM
55% 1 RM
60% 1 RM
65% 1 RM
70% 1 RM
75% 1 RM
80% 1 RM
85% 1 RM
90% 1 RM
95% 1 RM


Enter the amount of weight you lifted and the number of reps you lifted it for (the number of reps must be between 1 and 10 in order for the calculation to work).
Your One Rep Max will appear at the top and all your percentages will appear below it.

Calculator 2

1 Rep Max Calculator

Weight Lifted In Pounds:

Number of Reps:

Your Approximate 1 Rep Max is


Another Method

Reps %1RM
1 100
2 95
3 90
4 88
5 86
6 83
7 80
8 78
9 76
10 75
11 72
12 70

USING THE TABLE: This is how you use the table. Find the number of reps to concentric failure that you can perform with a certain weight. In other words, if you can only do eight reps with a certain weight and could not possible do another full rep, that is your point of failure. Find the percentage associated with that number of repetitions from the table above.

Now, divide the weight that you can do by that percentage using decimals (83 percent equals .83) and that will give you an approximation of your one repetition maximum. For example, if you can perform 10 reps with 175 lbs. in the bench press, that means that 175 lbs. is 75% (0.75) of your one repetition maximum. So you would take 175 divided by .75 and that would equal 233 lbs. You should probably use your calculator, we knew a guy who did it in his head and said he could bench 3000 lbs. Good luck!

Tags: Bemch Press Deadlift Squats

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