diff --git a/kdump-lib.sh b/kdump-lib.sh
index ae39c23..9c1d9e1 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -862,7 +862,7 @@ has_aarch64_smmu()
 	ls /sys/devices/platform/arm-smmu-* 1> /dev/null 2>&1
 }
 
-is_memsize() { [[ "$1" =~ ^[+-]?[0-9]+[KkMmGg]?$ ]]; }
+is_memsize() { [[ "$1" =~ ^[+-]?[0-9]+[KkMmGgTtPbEe]?$ ]]; }
 
 # range defined for crashkernel parameter
 # i.e. <start>-[<end>]
@@ -893,6 +893,18 @@ to_bytes()
 			_s=${_s::-1}
 			_s="$((_s * 1024 * 1024 * 1024))"
 			;;
+		T|t)
+			_s=${_s::-1}
+			_s="$((_s * 1024 * 1024 * 1024 * 1024))"
+			;;
+		P|p)
+			_s=${_s::-1}
+			_s="$((_s * 1024 * 1024 * 1024 * 1024 * 1024))"
+			;;
+		E|e)
+			_s=${_s::-1}
+			_s="$((_s * 1024 * 1024 * 1024 * 1024 * 1024 * 1024))"
+			;;
 		*)
 			;;
 	esac
@@ -901,7 +913,7 @@ to_bytes()
 
 memsize_add()
 {
-	local -a units=("" "K" "M" "G")
+	local -a units=("" "K" "M" "G" "T" "P" "E")
 	local i a b
 
 	a=$(to_bytes "$1") || return 1
diff --git a/spec/kdump-lib_spec.sh b/spec/kdump-lib_spec.sh
index 814f961..f13372c 100644
--- a/spec/kdump-lib_spec.sh
+++ b/spec/kdump-lib_spec.sh
@@ -52,14 +52,20 @@ Describe 'kdump-lib'
 		Context "For valid input values"
 			Parameters
 				"1G-4G:256M,4G-64G:320M,64G-:576M" "100M" "1G-4G:356M,4G-64G:420M,64G-:676M"
+				"1G-4G:256M" "100" "1G-4G:268435556" # avoids any rounding when size % 1024 != 0
 				"1G-4G:256M,4G-64G:320M,64G-:576M@4G" "100M" "1G-4G:356M,4G-64G:420M,64G-:676M@4G"
 				"1G-4G:1G,4G-64G:2G,64G-:3G@4G" "100M" "1G-4G:1124M,4G-64G:2148M,64G-:3172M@4G"
 				"1G-4G:10000K,4G-64G:20000K,64G-:40000K@4G" "100M" "1G-4G:112400K,4G-64G:122400K,64G-:142400K@4G"
 				"1,high" "1" "2,high"
 				"1K,low" "1" "1025,low"
+				"128G-1T:4G" "0" "128G-1T:4G"
+				"10T-100T:1T" "0" "10T-100T:1T"
+				"128G-1T:4G" "0M" "128G-1T:4G"
+				"128G-1P:4G" "0M" "128G-1P:4G"
+				"128G-1E:4G" "0M" "128G-1E:4G"
 				"1M@1G" "1k" "1025K@1G"
 				"500M@1G" "-100m" "400M@1G"
-				"1099511627776" "0" "1024G"
+				"1099511627776" "0" "1T"
 			End
 			It "should add delta to every value after ':'"
 				When call _crashkernel_add "$1" "$2"