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Short Rate Calculator

We Insure Things – Short-Rate / Pro-Rata Cancellation Calculator
WIT

Short-Rate / Pro-Rata Cancellation

Better coverage. Fewer surprises. Fast.

The calculator below shows earned and unearned (return premium) factors for Short Rate and Pro Rata methods. The default method is Short Rate (90% Pro Rata) for a 12-month policy.

We Insure Things provides this tool as a courtesy. Results are approximations only and do not change or replace policy terms, rating manuals, or carrier calculations.

Date of Cancellation: / / MONTH/DAY/YEAR (example: 2/23/2025)
Term in Months:
Effective Date: / / MONTH/DAY/YEAR (example: 6/13/2024)
Expiration Date: / / MONTH/DAY/YEAR (example: 6/13/2025)
Days in Effect:
Remaining Days:
Factor Method:
Earned Factor: (decimal; do not use commas)
Unearned Factor:
Premium: $
Earned Premium: $
Return Premium: $
For state-specific workers’ comp rules (e.g., NC NCRB Appendix B), always verify factors against the applicable rating manual.