diff --git a/packages/calcite-components/src/utils/locale.ts b/packages/calcite-components/src/utils/locale.ts
index 42fb4d9ef39..448d2bd90dd 100644
--- a/packages/calcite-components/src/utils/locale.ts
+++ b/packages/calcite-components/src/utils/locale.ts
@@ -402,7 +402,11 @@ export class NumberStringFormat {
     ].reverse();
 
     const index = new Map(this._digits.map((d, i) => [d, i]));
-    const parts = new Intl.NumberFormat(this._numberFormatOptions.locale).formatToParts(-12345678.9);
+
+    // numberingSystem is parsed to return consistent decimal separator across browsers.
+    const parts = new Intl.NumberFormat(this._numberFormatOptions.locale, {
+      numberingSystem: this._numberFormatOptions.numberingSystem
+    } as Intl.NumberFormatOptions).formatToParts(-12345678.9);
 
     this._actualGroup = parts.find((d) => d.type === "group").value;
     // change whitespace group characters that don't render correctly