diff --git a/src/ts/plugins/metrica.ts b/src/ts/plugins/metrica.ts
index e368660c..70ef4dd7 100644
--- a/src/ts/plugins/metrica.ts
+++ b/src/ts/plugins/metrica.ts
@@ -38,7 +38,7 @@ export function metricaPlugin(data:string, toSystem:'metrics'|'imperial'){
         });
     }
     //convert height like 5' 11'' to 180 cm
-    const reg = /(\d+)'?\s*(\d+)"?/g;
+    const reg = /(\d+)'\s*(\d+)"/g;
     data = data.replace(reg, (_, feet, inch) => {
         const result = parseFloat(feet) * 30.48 + parseFloat(inch) * 2.54;
         return `${result.toFixed(2)} cm`;