# One Rep Max Calculator

In Bench Press training, the maximum force generated during one maximal contraction is called as Repetition maximum. It determines the individual's maximum strength. One Rep Max can either be calculated directly using maximal testing or indirectly using submaximal estimation. There are many different formulas to estimate 1 RM, all with slightly different calculations. Use this One Rep Max Calculator to find the repetition maximum of an individual.

In Bench Press training, the maximum force generated during one maximal contraction is called as Repetition maximum. It determines the individual's maximum strength. One Rep Max can either be calculated directly using maximal testing or indirectly using submaximal estimation. There are many different formulas to estimate 1 RM, all with slightly different calculations. Use this One Rep Max Calculator to find the repetition maximum of an individual.

Code to add this calci to your website

#### Formula:

Epley 1RM = w × ( 1 + ( r / 30 ) )
Brzycki 1RM = w / ( 1.0278 - ( 0.0278 × r ) )
Lombardi 1RM = w × r^{0.10}
Mayhew et al. 1RM = ( 100 × w ) / (52.2 + ( 41.9 × e^{( -0.055 × r )}) )
O'Conner et al. 1RM = w × ( 1 + ( r / 40 ) )
Wathan 1RM = ( 100 × w ) / ( 48.8 + ( 53.8 × e^{(-0.075 × r )}) )
**Where,**
w = Weight
r = Repetitions
The most popular formula to calculate One Rep Max Bench Press is the Brzycki formula from Matt Brzycki.

### Example:

Raju's weight is 50kg and his Repetitions in Bench press is 8. Find the 1 RM score?

#### Solution:

Epley 1RM = 50 × ( 1 + ( 8 / 30 ) )

= 63

Brzycki 1RM = 50 / ( 1.0278 - ( 0.0278 × 8 ) )

= 62

Lombardi 1RM = 50 × 8^{0.10}

= 62

Mayhew et al. 1RM = ( 100 × 50 ) / (52.2 + ( 41.9 × e^{( -0.055 × 8 )}) )

= 63

O'Conner et al. 1RM = 50 × ( 1 + ( 8 / 40 ) )

= 60

Wathan 1RM = ( 100 × 50 ) / ( 48.8 + ( 53.8 × e^{(-0.075 × 8 )}) )

=63

**Note :**This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.