Experience Rating Mod Calculator

Calculate workers' compensation experience modification factor based on actual vs expected losses.

Actual Losses

Expected Losses

Ballast Value

Primary Loss Weight

Excess Loss Weight

Tab to move between fields

Experience Mod

0.91

Premium Impact

-9%

Primary Actual Losses$240,000.00

Excess Actual Losses$560,000.00

Mod Deviation (%)-9%

How to Use This Calculator

Enter the insured's historical premium and losses for each experience year.
Set the credibility weight based on premium volume.
Input the expected loss ratio from industry or manual rates.
Review the experience modification factor and resulting modified premium.
Experience rating rewards low-loss insureds with credits and surcharges high-loss insureds.

How the result changes with Expected Losses

Actual Losses: Total actual incurred losses for the experience period
Expected Losses: Expected losses based on payroll and class rates
Ballast Value: Ballast (stabilizing) value to prevent extreme mod swings
Primary Loss Weight: Proportion of losses classified as primary (frequency-driven)
Excess Loss Weight: Weight given to excess (severity-driven) losses in the mod formula

Identify Input Parameters
4 parameters
Actual Losses = 800000, Expected Losses = 1000000, Ballast Value = 500000, Primary Loss Weight = 0.3 = 5 input(s) provided
Calculate Experience Mod
Experience Mod
0.91 = 0.91
Calculate Premium Impact
Premium Impact
-9 = -9%
Calculate Primary Actual Losses
Primary Actual Losses
240000 = $240,000
Calculate Excess Actual Losses
Excess Actual Losses
560000 = $560,000