diff --git a/changelog.md b/changelog.md
index cfca3426..318b184a 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,9 @@
 ## Changelog
 
+#### v1.6.3
+
+* `[strutil]` Added methods PrefixSize and SuffixSize
+
 #### v1.6.2
 
 * `[fsutil]` Improved working with paths
diff --git a/strutil/strutil.go b/strutil/strutil.go
index d79db1fc..c1ead208 100644
--- a/strutil/strutil.go
+++ b/strutil/strutil.go
@@ -110,3 +110,41 @@ func Tail(s string, n int) string {
 
 	return s[l-n:]
 }
+
+// PrefixSize return prefix size
+func PrefixSize(str string, prefix rune) int {
+	if str == "" {
+		return 0
+	}
+
+	var result int
+
+	for i := 0; i < len(str); i++ {
+		if rune(str[i]) != prefix {
+			return result
+		}
+
+		result++
+	}
+
+	return result
+}
+
+// SuffixSize return suffix size
+func SuffixSize(str string, suffix rune) int {
+	if str == "" {
+		return 0
+	}
+
+	var result int
+
+	for i := len(str) - 1; i >= 0; i-- {
+		if rune(str[i]) != suffix {
+			return result
+		}
+
+		result++
+	}
+
+	return result
+}
diff --git a/strutil/strutil_test.go b/strutil/strutil_test.go
index 6368f7cf..bdc6fb0e 100644
--- a/strutil/strutil_test.go
+++ b/strutil/strutil_test.go
@@ -67,3 +67,15 @@ func (s *StrUtilSuite) TestTail(c *C) {
 	c.Assert(Tail("ABCD1234", 4), Equals, "1234")
 	c.Assert(Tail("ABCD1234", 100), Equals, "ABCD1234")
 }
+
+func (s *StrUtilSuite) TestSize(c *C) {
+	c.Assert(PrefixSize("", ' '), Equals, 0)
+	c.Assert(PrefixSize("abcd", ' '), Equals, 0)
+	c.Assert(PrefixSize("    abcd", ' '), Equals, 4)
+	c.Assert(PrefixSize("    ", ' '), Equals, 4)
+
+	c.Assert(SuffixSize("", ' '), Equals, 0)
+	c.Assert(SuffixSize("abcd", ' '), Equals, 0)
+	c.Assert(SuffixSize("abcd    ", ' '), Equals, 4)
+	c.Assert(SuffixSize("    ", ' '), Equals, 4)
+}