diff --git a/src/utils/convert-si-unit-to-number.ts b/src/utils/convert-si-unit-to-number.ts
index ab3a013..6e96ff7 100644
--- a/src/utils/convert-si-unit-to-number.ts
+++ b/src/utils/convert-si-unit-to-number.ts
@@ -30,6 +30,7 @@ const target_conversion = {
   length: "mm",
   time: "ms",
   volume: "ml",
+  angle: "deg",
 }
 
 function getSiPrefixMultiplierFromUnit(v: string): number {