diff --git a/engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelUtil.java b/engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelUtil.java
index fd3e4a387b..f0f21061f7 100644
--- a/engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelUtil.java
+++ b/engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelUtil.java
@@ -479,7 +479,7 @@ public static int convertToPt(String size) {
 			} else if (size.endsWith("cm")) {
 				return (int) (s / 2.54 * 72);
 			} else if (size.endsWith("mm")) {
-				return (int) (s * 10 / 2.54 * 72);
+				return (int) (s / 10 / 2.54 * 72);
 			} else if (size.endsWith("pc")) {
 				return s;
 			} else {
diff --git a/engine/org.eclipse.birt.report.engine.emitter.wpml/src/org/eclipse/birt/report/engine/emitter/wpml/WordUtil.java b/engine/org.eclipse.birt.report.engine.emitter.wpml/src/org/eclipse/birt/report/engine/emitter/wpml/WordUtil.java
index ee7a7c06af..fd3657a4bc 100644
--- a/engine/org.eclipse.birt.report.engine.emitter.wpml/src/org/eclipse/birt/report/engine/emitter/wpml/WordUtil.java
+++ b/engine/org.eclipse.birt.report.engine.emitter.wpml/src/org/eclipse/birt/report/engine/emitter/wpml/WordUtil.java
@@ -414,7 +414,7 @@ public static int convertToPt(String size) {
 			} else if (size.endsWith("cm")) {
 				return (int) (s / 2.54 * 72);
 			} else if (size.endsWith("mm")) {
-				return (int) (s * 10 / 2.54 * 72);
+				return (int) (s / 10 / 2.54 * 72);
 			} else if (size.endsWith("pc")) {
 				return s;
 			} else {