WCMA - Classing Calculator 2026

How to Use

Enter your vehicle's competition weight and declared horsepower to calculate your base ratio. Select any applicable modification factors from the dropdowns, and the calculator will automatically update your modified ratio and calculated class in real-time. Review the results in the calculation box on the right before submitting.

Contact Information & Supporting Documents

Please attach supporting documents (e.g., dyno sheet, maximum file size 2 MB) (PDF, DOC, JPG, JPEG, or PNG)

Name *

Email *

Year *

Make *

Model *

Comments

Dyno Chart

Exported Dyno Table

Car Image

Vehicle Factors

Competition Wgt (lbs) *

Declared HP *

Dyno HP (optional)

Chassis

+0.00

Body Mods

+0.00

Transmission

+0.00

Drivetrain

+0.00

Tires

+0.00

IT1/IT2: Tire width based on vehicle weight

Brake & Suspension (IT1/IT2)

IT1/IT2 only

+0.00

Note: Print out a copy for yourself before hitting submit.

Calculation Results

Weight Factor: --

Base Ratio: --

Additional Mod Factors: --

Modified Ratio: --

                                Calculated Class:
                                --
                            

Class Ranges

GTU < 6.00

GT1 6.00 - 7.99

GT2 8.00 - 9.99

GT3 10.00 - 11.99

GT4 12.00 - 13.99

IT1 14.00 - 17.99

IT2 >= 18.00