USBC Headquarters developed specific calculations to help the leagues and tournaments comply with the Sport Bowling pattern requirements. The spreadsheet verifies the ratio requirement and the other calculations that are necessary for the compliance of the pattern.

Please be aware that these calculations should be done prior to competitive play to determine if the Sport Bowling pattern being used is in compliance. It must be submitted to USBC Headquarters (along with the graphs) on a weekly basis through email, fax, or regular mail to the Specifications/Certification Department. If you have any questions, comments, or concerns, please contact the Sport Bowling team at or (800) 514-2695, ext. 3177.

Automatic Calculations
3:1 Ratio Compliance
For those leagues/tournaments that have Microsoft Excel. Calculations are embedded into the spreadsheet calculated automatically.