diff --git a/src/specificClass.js b/src/specificClass.js
index 679f3b9..6152946 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -198,6 +198,32 @@ _callMeasurementHandler(measurementType, value, position, context) {
     return reversedCurve;
   }
 
+  getHealthIndex() {
+  if (!this.driftHistory || this.driftHistory.length === 0) {
+    this.logger.debug("HealthIndex: No drift history yet.");
+    return 1; // 1.0 = fully healthy
+  }
+
+  const avg = (arr) => {
+    if (!arr || arr.length === 0) return 0;
+    return arr.reduce((sum, d) => sum + (d.nrmse || 0), 0) / arr.length;
+  };
+
+  const flowDrift = this.driftHistory.filter(d => d.measurement === "flow");
+  const powerDrift = this.driftHistory.filter(d => d.measurement === "power");
+
+  const avgDrift = (avg(flowDrift) + avg(powerDrift)) / 2;
+
+  // relDistFromPeak is already stored internally (0 = best, 1 = worst)
+  const efficiencyScore = 1 - (this.relDistFromPeak || 0);
+
+  const healthIndex = (0.6 * efficiencyScore + 0.4 * (1 - avgDrift));
+
+  this.logger.debug(`💚 Health Index Calculated: ${healthIndex.toFixed(3)} (eff=${efficiencyScore.toFixed(3)}, drift=${avgDrift.toFixed(3)})`);
+
+  return healthIndex.toFixed(3);
+}
+
   // -------- Config -------- //
   updateConfig(newConfig) {
     this.config = this.configUtils.updateConfig(this.config, newConfig);