Overview
The Experience Modification Estimator is a spreadsheet-based application that estimates an experience modification based on the corresponding year's Experience Rating Plan values including expected loss rates, D-ratios and primary thresholds that vary by employer size that have been approved by the California Insurance Commissioner. Estimators rely on payroll, classification and claims information supplied by the user. A Help Guide is available in each Estimator to assist users.
We Want to Hear from You!
We are working on improvements to the Experience Modification Estimator and want your valuable input. Please complete the following 2-minute survey that will help shape the next version of the Estimator.
Estimator Versions
September 1, 2024 Experience Modification Estimator
- September 1, 2024 Experience Modification Estimator
- For tips on using the Estimator, view the September 1, 2024 Experience Modification Estimator Start Guide.
September 1, 2023 Experience Modification Estimator
- September 1, 2023 Experience Modification Estimator
- For tips on using the Estimator, view the September 1, 2023 Experience Modification Estimator Start Guide.
September 1, 2022 Experience Modification Estimator
- September 1, 2022 Experience Modification Estimator
- For tips on using the Estimator, view the September 1, 2022 Experience Modification Estimator Start Guide.
September 1, 2021 Experience Modification Estimator
- September 1, 2021 Experience Modification Estimator
- For tips on using the Estimator, view the September 1, 2021 Experience Modification Estimator Start Guide.
January 1, 2021 Experience Modification Estimator
- January 1, 2021 Experience Modification Estimator
- For tips on using the Estimator, view the January 1, 2021 Experience Modification Estimator Start Guide.
Version Updates
Users who choose to download and save the Estimator to their computer are responsible for ensuring that they are accessing the most current version. The WCIRB will notify users of any version updates via wcirb.com and the WCIRB News and Notes e-newsletter. Make sure to subscribe today!
Experience Rating Resources
More Information
The estimated experience modifications resulting from the Experience Modification Estimator applications rely on payroll, classification and claims information supplied by the user. Actual classifications, payroll and claims amounts used by the WCIRB to calculate an experience modification may be different. Users will get detailed printable results for each estimated experience modification. User-entered data can be copied and pasted between the two spreadsheets. The Estimator is for informational purposes only. Results are only estimates and not published experience modifications. For help on any of the Estimator’s features and tips on obtaining an accurate estimate, open the Help Guide available on the first tab as a downloadable PDF.