OpenChainGraph Suite · ART-346 · Workers’ Compensation

NCCI Experience Modification Calculator

Workers’-compensation experience rating modification per the NCCI Experience Rating Plan Manual’s published national formula: split each claim into primary and excess at the state split point, then Mod = (Ap + W×Ae + (1-W)×Ee + B) / (Ep + B).

NCCI Experience Rating Plan Primary/Excess Split Weighting · Ballast

🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.

⚠ NCCI split points, expected losses, expected primary losses, weighting values, and ballast values come from licensed NCCI/state rating-bureau tables. Look those values up on your own NCCI experience rating worksheet and enter them below — this tool never ships or reproduces the tables themselves, only the published split-and-mod formula.

Claims (Actual Incurred Losses)

Rating Values (from your NCCI worksheet)

Split point ($)

Per-claim/per-accident state split point.

Expected losses ($)

Expected primary losses ($)

Weighting value (W, 0–1)

Ballast value B ($)

Rating Detail

Execution Hash (SHA-256)