diff --git a/src/main/java/org/codelibs/fess/taglib/FessFunctions.java b/src/main/java/org/codelibs/fess/taglib/FessFunctions.java
index f83136c26..19d83b01c 100644
--- a/src/main/java/org/codelibs/fess/taglib/FessFunctions.java
+++ b/src/main/java/org/codelibs/fess/taglib/FessFunctions.java
@@ -23,6 +23,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.text.DecimalFormat;
+import java.text.NumberFormat;
 import java.text.SimpleDateFormat;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
@@ -154,25 +155,49 @@ public class FessFunctions {
         return date.format(DateTimeFormatter.ofPattern(Constants.ISO_DATETIME_FORMAT, Locale.ROOT));
     }
 
-    public static String formatNumber(final long value) {
-        int ratio = 1;
-        String unit = "";
+    public static String formatNumber(final long value, final String pattern) {
+        final DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(getUserLocale());
+        df.applyPattern(pattern);
+        return df.format(value);
+    }
+
+    private static Locale getUserLocale() {
+        final Locale locale = ComponentUtil.getRequestManager().getUserLocale();
+        if (locale == null) {
+            return Locale.ROOT;
+        }
+        return locale;
+    }
+
+    public static String formatFileSize(final long value) {
+        double target = (double) value;
+        String unit = ""; // TODO l10n?
         String format = "0.#";
         if (value < 1024) {
             format = "0";
-        } else if (value < (1024 * 1024)) {
-            ratio = 1024;
+        } else if (value < 1024L * 1024L) {
+            target /= 1024;
             unit = "K";
-        } else if (value < (1024 * 1024 * 1024)) {
-            ratio = 1024 * 1024;
+        } else if (value < 1024L * 1024L * 1024L) {
+            target /= 1024;
+            target /= 1024;
             unit = "M";
-        } else {
-            ratio = 1024 * 1024 * 1024;
+        } else if (value < 1024L * 1024L * 1024L * 1024L) {
+            target /= 1024;
+            target /= 1024;
+            target /= 1024;
             unit = "G";
+        } else {
+            target /= 1024;
+            target /= 1024;
+            target /= 1024;
+            target /= 1024;
+            unit = "T";
         }
-        final DecimalFormat df = new DecimalFormat(format + unit);
+        final DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(getUserLocale());
+        df.applyPattern(format);
         df.setRoundingMode(RoundingMode.HALF_UP);
-        return df.format((double) value / ratio);
+        return df.format(target) + unit;
     }
 
     public static String pagingQuery(final String query) {
diff --git a/src/main/webapp/WEB-INF/fe.tld b/src/main/webapp/WEB-INF/fe.tld
index 0ef90486e..7e2193d49 100644
--- a/src/main/webapp/WEB-INF/fe.tld
+++ b/src/main/webapp/WEB-INF/fe.tld
@@ -71,15 +71,27 @@
     </example>
   </function>
 
+  <function>
+    <description>
+      Returns formatted number as a file size from a given value.
+    </description>
+    <name>formatFileSize</name>
+    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
+    <function-signature>java.lang.String formatFileSize(long)</function-signature>
+    <example>
+      ${fe:formatFileSize(doc.content_length)}
+    </example>
+  </function>
+
   <function>
     <description>
       Returns formatted number from a given value.
     </description>
     <name>formatNumber</name>
     <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
-    <function-signature>java.lang.String formatNumber(long)</function-signature>
+    <function-signature>java.lang.String formatNumber(long, java.lang.String)</function-signature>
     <example>
-      ${fe:formatNumber(doc.content_length)}
+      ${fe:formatNumber(doc.content_length, "###,###")}
     </example>
   </function>
 
diff --git a/src/main/webapp/WEB-INF/view/searchResults.jsp b/src/main/webapp/WEB-INF/view/searchResults.jsp
index 80b9feb2d..01f8b6bdd 100644
--- a/src/main/webapp/WEB-INF/view/searchResults.jsp
+++ b/src/main/webapp/WEB-INF/view/searchResults.jsp
@@ -5,12 +5,12 @@
 		<p>
 			<c:if test="${allRecordCountRelation=='EQUAL_TO'}">
 				<la:message key="labels.search_result_status"
-					arg0="${displayQuery}" arg1="${f:h(allRecordCount)}"
+					arg0="${displayQuery}" arg1="${fe:formatNumber(allRecordCount,'###,###')}"
 					arg2="${f:h(currentStartRecordNumber)}"
 					arg3="${f:h(currentEndRecordNumber)}" />
 			</c:if><c:if test="${allRecordCountRelation!='EQUAL_TO'}">
 				<la:message key="labels.search_result_status_over"
-					arg0="${displayQuery}" arg1="${f:h(allRecordCount)}"
+					arg0="${displayQuery}" arg1="${fe:formatNumber(allRecordCount,'###,###')}"
 					arg2="${f:h(currentStartRecordNumber)}"
 					arg3="${f:h(currentEndRecordNumber)}" />
 			</c:if>
@@ -69,7 +69,7 @@
 						<small class="d-none d-lg-inline-block"> <la:link
 								href="/search?q=${f:u(q)}&ex_q=${f:u(queryEntry.value)}&sdh=${f:u(fe:sdh(doc.similar_docs_hash))}${fe:facetQuery()}${fe:geoQuery()}">
 								<la:message key="labels.search_result_similar"
-											arg0="${fe:formatNumber(doc.similar_docs_count-1)}" />
+											arg0="${fe:formatFileSize(doc.similar_docs_count-1)}" />
 							</la:link>
 						</small>
 					</c:if>
@@ -103,7 +103,7 @@
 							</c:if>
 							<c:set var="hasInfo" value="true" />
 							<la:message key="labels.search_result_size"
-								arg0="${fe:formatNumber(doc.content_length)}" />
+								arg0="${fe:formatFileSize(doc.content_length)}" />
 						</c:if> <c:if test="${searchLogSupport}">
 							<c:if test="${hasInfo}">
 								<div class="d-sm-none"></div>
diff --git a/src/test/java/org/codelibs/fess/taglib/FessFunctionsTest.java b/src/test/java/org/codelibs/fess/taglib/FessFunctionsTest.java
index 923495620..e02e1cbc3 100644
--- a/src/test/java/org/codelibs/fess/taglib/FessFunctionsTest.java
+++ b/src/test/java/org/codelibs/fess/taglib/FessFunctionsTest.java
@@ -20,6 +20,21 @@ import java.util.Date;
 import org.codelibs.fess.unit.UnitFessTestCase;
 
 public class FessFunctionsTest extends UnitFessTestCase {
+    public void test_formatNumber() {
+        assertEquals("0", FessFunctions.formatNumber(0, "###,###"));
+        assertEquals("1,000", FessFunctions.formatNumber(1000, "###,###"));
+        assertEquals("1,000,000", FessFunctions.formatNumber(1000000, "###,###"));
+    }
+
+    public void test_formatFileSize() {
+        assertEquals("0", FessFunctions.formatFileSize(0));
+        assertEquals("1000", FessFunctions.formatFileSize(1000));
+        assertEquals("976.6K", FessFunctions.formatFileSize(1000000));
+        assertEquals("953.7M", FessFunctions.formatFileSize(1000000000));
+        assertEquals("931.3G", FessFunctions.formatFileSize(1000000000000L));
+        assertEquals("909.5T", FessFunctions.formatFileSize(1000000000000000L));
+    }
+
     public void test_parseDate() {
         Date date;