diff --git a/BMI.js b/BMI.js
new file mode 100644
index 0000000..6f5ecbf
--- /dev/null
+++ b/BMI.js
@@ -0,0 +1,30 @@
+function getBMI(W,H) {
+    var BMI = W/((H/100)*(H/100));
+    return BMI;
+}
+
+getBMI(59,180);
+console.log("BMI: "+getBMI(59,180));
+
+function getMESSAGE(W,H) {
+    var bmi = W/((H/100)*(H/100));
+    if (bmi < 18.5) {
+        console.log("體重過輕")
+    }
+    else if (18.5 <= bmi <= 24){
+        console.log("正常範圍")
+    }
+    else if (24 <= bmi <= 27){
+        console.log("過重")
+    }
+    else if (27 <= bmi <= 30){
+        console.log("輕度肥胖")
+    }
+    else if (30 <= bmi < 35){
+        console.log("中度肥胖")
+    }
+    else if (35 <= bmi ){
+        console.log("重度肥胖")
+    }
+}
+getMESSAGE(59,180);
\ No newline at end of file