This 1RM calculator uses weight and reps1 performed to estimate your one rep max.

## 1RM Formula

The formula used for this calculation is: 1RM = Weight in pounds/(1.0278-(.0278 x reps1))

Reps performed
Weight in pounds
or
Weight in kilograms

## Calculating Multiple Reps from your 1RM

This table below helps you figure out what weight to use (+/- 5 pounds) for a goal number of reps based on your 1RM. For example, if your 1RM is 250 and you wanted to do a set of 8 reps, multiple 250 by .786 to get 196.5 for a weigh range of 191.5 - 201.5 pounds for your 8 rep set. If you've been doing lighter weight for more reps (10+), or heavier weight for fewer reps (3 or less), it won't be as accurate.

Enter you 1RM and the coefficient based on your rep goal into the form below and click calcualte.

1RM weight in pounds
or
1RM weight in kilograms
Coefficint based on rep goal
 Reps CoEfficient 1 1.00 2 .943 3 .906 4 .881 5 .856 6 .831 7 .807 8 .786 9 .765 10 .744
 Reps CoEfficient 11 .723 12 .703 13 .688 14 .675 15 .662 16 .650 17 .638 18 .627 19 .616 20 .606

## Another Chart for your 1-rep Max

Here's another chart with values you can use to calculate your one rep max based on the exercise and reps.

1RM weight in pounds
 Repetitions Squat Benchpress Deadlift 1 1.0 1.0 1.0 2 1.0475 1.035 1.065 3 1.13 1.08 1.13 4 1.1575 1.115 1.147 5 1.2 1.15 1.164 6 1.242 1.18 1.181 7 1.284 1.22 1.198 8 1.326 1.255 1.232 9 1.368 1.29 1.232 10 1.41 1.325 1.24

## A Formula for your 1-rep Max

This formual estimates your one rep max based on reps and weight used. Enter reps and the weight into the form beliow click calculate. ((Reps x .033) + 1) x Weight

Reps
Weight in pounds