diff --git a/codewars/7kyu/width-height-ratio/koronya.js b/codewars/7kyu/width-height-ratio/koronya.js
new file mode 100644
index 000000000..f2eee8d22
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+++ b/codewars/7kyu/width-height-ratio/koronya.js
@@ -0,0 +1,22 @@
+// [JS][7kyu] Width-Height Ratio
+// width-height-ratio
+// https://www.codewars.com/kata/55486cb94c9d3251560000ff/train/javascript
+
+const getGcd = (a, b) => {
+  if (a === 0) {
+    return b
+  }
+  return getGcd(b % a, a)
+}
+
+const calculateRatio = (w, h) => {
+  if (w === 0 || h === 0) {
+    throw new Error('Width and height must be greater than 0')
+  }
+
+  const divisor = getGcd(w, h)
+  return `${w / divisor}:${h / divisor}`
+}
+
+const results1 = calculateRatio(1024, 768)
+const results2 = calculateRatio(1920, 1080)
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