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.