A bowling average is calculated by adding the total games bowled and dividing the total by the number of games bowled. When you bowl in a bowling league, your average is calculated each week or session (leagues typically bowl once a week). Bowling averages are accumulative for the duration of a league. Below is an example of how to calculate a bowling average for the first three weeks of a league that bowls three games per week.

**Week 1**

Bowler bowls games of 60, 73 and 84.

Calculate the *series* by adding the three games together:

68+73+84 = 225 series

To calculate the average for the first week we divide the series by 3 games:

225 divided by 3 = 75

**The bowlers average after week 1 is 75.**

**Week 2**

Bowler bowls games of 58, 83 and 77.

Calculate the series by adding the three games together:

58+83+77 = 218 series

Next, add the series from week 2 to the series from week 1 to get the *total pins* bowled:

225+218 = 443 total pins

Since he has bowled a total of 6 games, divide the total pins by 6:

443 divided by 6 = 72.833333 (rounded to 6 decimal points)

The fraction is always dropped when calculating a bowling average.

**The bowlers average after week 2 is 72.**

**Week 3**

Bowler bowls games of 81, 93 and 77.

Calculate the series by adding the three games together:

81+93+77 = 251

Next, add the series from week 3 to the total pins from week 2 to get the current total pins :

443+251 = 694 total pins

Divide the total pins after week three by the total games bowled:

694 divided by 9 = 77.111111 (rounded to 6 decimal points)

**The bowlers average after week 3 is 77.**

The bowlers average will continue to be calculated each week or session until the end of the league schedule. Each time a bowler starts a new league, the average will start from the first week or session. If a bowler bowls in more than one league, they will have a separate average for each league bowled.