diff --git a/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java b/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
index 3e8afed..46db817 100644
--- a/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
+++ b/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
@@ -152,12 +152,12 @@ public class HourStatsAggregator {
 	 * @return 백분위 응답시간 (ms)
 	 */
 	private long calculatePercentile(double percentile) {
-		long total = totalCnt.get();
-		if (total == 0) {
+		long avgCount = getAvgCount();
+		if (avgCount == 0) {
 			return 0;
 		}
 
-		long targetCount = (long) Math.ceil(total * percentile / 100.0);
+		long targetCount = (long) Math.ceil(avgCount * percentile / 100.0);
 		long accumulated = 0;
 
 		for (int i = 0; i < respTimeBuckets.length; i++) {
@@ -193,7 +193,7 @@ public class HourStatsAggregator {
 		long timeout = timeoutCnt.get();
 		long systemErr = systemErrCnt.get();
 		long bizErr = bizErrCnt.get();
-		long avgCount = success + timeout + systemErr + bizErr;
+		long avgCount = getAvgCount();
 
 		stats.setTotalCnt(total);
 		stats.setSuccessCnt(success);
@@ -233,6 +233,14 @@ public class HourStatsAggregator {
 		return stats;
 	}
 
+	private long getAvgCount() {
+		long success = successCnt.get();
+		long timeout = timeoutCnt.get();
+		long systemErr = systemErrCnt.get();
+		long bizErr = bizErrCnt.get();
+		return success + timeout + systemErr + bizErr;
+	}
+
 	/**
 	 * 집계된 총 건수 반환 (빈 집계기 체크용)
 	 */
diff --git a/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java b/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
index 4a5c1cb..d5c59b5 100644
--- a/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
+++ b/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
@@ -152,12 +152,12 @@ public class MinuteStatsAggregator {
 	 * @return 백분위 응답시간 (ms)
 	 */
 	private long calculatePercentile(double percentile) {
-		long total = totalCnt.get();
-		if (total == 0) {
+		long avgCount = getAvgCount();
+		if (avgCount == 0) {
 			return 0;
 		}
 
-		long targetCount = (long) Math.ceil(total * percentile / 100.0);
+		long targetCount = (long) Math.ceil(avgCount * percentile / 100.0);
 		long accumulated = 0;
 
 		for (int i = 0; i < respTimeBuckets.length; i++) {
@@ -239,4 +239,12 @@ public class MinuteStatsAggregator {
 	public long getTotalCount() {
 		return totalCnt.get();
 	}
+	
+	private long getAvgCount() {
+		long success = successCnt.get();
+		long timeout = timeoutCnt.get();
+		long systemErr = systemErrCnt.get();
+		long bizErr = bizErrCnt.get();
+		return success + timeout + systemErr + bizErr;
+	}
 }