The Sport Bowling conditions are more challenging than typical league conditions. Therefore, bowler averages under Sport Bowling conditions will typically be lower. We have confirmed this through the analysis of scores from Sport Bowling leagues and tournaments across North America.

In an effort to equalize competition during standard tournaments, the following adjustment scale has been created for bowlers only having a Sport Bowling average. The adjustment scale is to be used under the following conditions:

• The scale applies to Sport Bowlers who ONLY have a Sport Bowling average.
• If a bowler has an established standard average, that average shall be used for standard tournaments.
• This adjustment scale is not considered a "re-rate" of the bowler.Its purpose is to allow for a fair adjustment to what would be expected of the bowler on a standard league condition.
• The adjustment scale does not supersede the ability of a tournament director to further adjust upward any bowler's entering average in a tournament per Rule 319.
• As additional data is obtained, slight changes to the scale may occur. If so, the updated scale will be published here.
• The adjustment scale has been statistically designed to correct 95 percent of the Sport Bowling league averages to within 5 percent of a bowler's standard average.

Printable Average Adjustment Scale

Note: This Average Adjustment Scale is effective for
USBC Sport Bowling average adjustments from Aug. 1, 2007 - July 31, 2008.