diff --git a/src/main/resources/mappers/estimate/estimateMapper.xml b/src/main/resources/mappers/estimate/estimateMapper.xml
index 2e7aaa48..8d08a4a1 100644
--- a/src/main/resources/mappers/estimate/estimateMapper.xml
+++ b/src/main/resources/mappers/estimate/estimateMapper.xml
@@ -466,8 +466,9 @@
                  GROUP BY CIRCUIT_NO, CIRCUIT_ITEM_ID, CIRCUIT_CFG, CIRCUIT_SUM, PNOW_W
                      )
 
-                -- 2026-05-22: FLOAT ROUND 결과의 IEEE754 잔여(예: 5.5600000000000005) 차단 위해 DECIMAL(18,4) 캐스팅
-                SELECT CAST(ROUND((SUM(MIN_VALUE) / 1000), 4) AS DECIMAL(18,4))  AS CERT_VOL_KW
+                -- 2026-05-22: FLOAT ROUND 결과의 IEEE754 잔여(예: 5.5600000000000005) 차단 위해 DECIMAL 캐스팅
+                -- 2026-06-02: モジュール容量(totVolKw, setScale(3,FLOOR))과 동일 표시 위해 3자리 절사 + DECIMAL(18,3) 마감 (ROUND 3번째 인자=1 → 절사)
+                SELECT CAST(ROUND((SUM(MIN_VALUE) / 1000), 3, 1) AS DECIMAL(18,3))  AS CERT_VOL_KW
                 FROM CIRCUIT_AGG
 
         ]]>