diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1e64af..9cd3f5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# v1.3.0
+- Improving calculation of ratio for nonStandard case #1
+
 # v1.2.0
 - Add CommonJS support.
 - Add example.
diff --git a/package-lock.json b/package-lock.json
index 9ed8d56..ecb7160 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,19 +1,19 @@
 {
   "name": "calc-aspect-ratio",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "calc-aspect-ratio",
-      "version": "1.2.0",
+      "version": "1.3.0",
       "license": "MIT",
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         "@types/jest": "^29.5.12",
         "del-cli": "^5.1.0",
         "jest": "^29.7.0",
-        "rollup": "^4.10.0",
+        "rollup": "^4.12.0",
         "ts-jest": "^29.1.2",
         "tslib": "2.6.2",
         "typescript": "^5.3.3"
@@ -1020,9 +1020,9 @@
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+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
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@@ -1137,9 +1137,9 @@
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.12.0.tgz",
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@@ -1150,9 +1150,9 @@
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+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.12.0.tgz",
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@@ -1163,9 +1163,9 @@
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-      "integrity": "sha512-uFpayx8I8tyOvDkD7X6n0PriDRWxcqEjqgtlxnUA/G9oS93ur9aZ8c8BEpzFmsed1TH5WZNG5IONB8IiW90TQg==",
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.12.0.tgz",
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@@ -1176,9 +1176,9 @@
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+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.12.0.tgz",
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@@ -1189,9 +1189,9 @@
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-gnueabihf/-/rollup-linux-arm-gnueabihf-4.12.0.tgz",
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@@ -1202,9 +1202,9 @@
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@@ -1215,9 +1215,9 @@
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@@ -1228,9 +1228,9 @@
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@@ -1241,9 +1241,9 @@
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@@ -1254,9 +1254,9 @@
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@@ -1267,9 +1267,9 @@
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@@ -1280,9 +1280,9 @@
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@@ -1293,9 +1293,9 @@
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       "optionalDependencies": {
-        "@rollup/rollup-android-arm-eabi": "4.10.0",
-        "@rollup/rollup-android-arm64": "4.10.0",
-        "@rollup/rollup-darwin-arm64": "4.10.0",
-        "@rollup/rollup-darwin-x64": "4.10.0",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.10.0",
-        "@rollup/rollup-linux-arm64-gnu": "4.10.0",
-        "@rollup/rollup-linux-arm64-musl": "4.10.0",
-        "@rollup/rollup-linux-riscv64-gnu": "4.10.0",
-        "@rollup/rollup-linux-x64-gnu": "4.10.0",
-        "@rollup/rollup-linux-x64-musl": "4.10.0",
-        "@rollup/rollup-win32-arm64-msvc": "4.10.0",
-        "@rollup/rollup-win32-ia32-msvc": "4.10.0",
-        "@rollup/rollup-win32-x64-msvc": "4.10.0",
+        "@rollup/rollup-android-arm-eabi": "4.12.0",
+        "@rollup/rollup-android-arm64": "4.12.0",
+        "@rollup/rollup-darwin-arm64": "4.12.0",
+        "@rollup/rollup-darwin-x64": "4.12.0",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.12.0",
+        "@rollup/rollup-linux-arm64-gnu": "4.12.0",
+        "@rollup/rollup-linux-arm64-musl": "4.12.0",
+        "@rollup/rollup-linux-riscv64-gnu": "4.12.0",
+        "@rollup/rollup-linux-x64-gnu": "4.12.0",
+        "@rollup/rollup-linux-x64-musl": "4.12.0",
+        "@rollup/rollup-win32-arm64-msvc": "4.12.0",
+        "@rollup/rollup-win32-ia32-msvc": "4.12.0",
+        "@rollup/rollup-win32-x64-msvc": "4.12.0",
         "fsevents": "~2.3.2"
       }
     },
@@ -4463,9 +4463,9 @@
       }
     },
     "node_modules/spdx-exceptions": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.4.0.tgz",
-      "integrity": "sha512-hcjppoJ68fhxA/cjbN4T8N6uCUejN8yFw69ttpqtBeCbF3u13n7mb31NB9jKwGTTWWnt9IbRA/mf1FprYS8wfw==",
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.5.0.tgz",
+      "integrity": "sha512-PiU42r+xO4UbUS1buo3LPJkjlO7430Xn5SVAhdpzzsPHsjbYVflnnFdATgabnLude+Cqu25p6N+g2lw/PFsa4w==",
       "dev": true
     },
     "node_modules/spdx-expression-parse": {
@@ -4479,9 +4479,9 @@
       }
     },
     "node_modules/spdx-license-ids": {
-      "version": "3.0.16",
-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.16.tgz",
-      "integrity": "sha512-eWN+LnM3GR6gPu35WxNgbGl8rmY1AEmoMDvL/QD6zYmPWgywxWqJWNdLGT+ke8dKNWrcYgYjPpG5gbTfghP8rw==",
+      "version": "3.0.17",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.17.tgz",
+      "integrity": "sha512-sh8PWc/ftMqAAdFiBu6Fy6JUOYjqDJBJvIhpfDMyHrr0Rbp5liZqd4TjtQ/RgfLjKFZb+LMx5hpml5qOWy0qvg==",
       "dev": true
     },
     "node_modules/sprintf-js": {
diff --git a/package.json b/package.json
index b10372f..9230c52 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "calc-aspect-ratio",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "Calc aspect ratio for display resolutions",
   "type": "module",
   "main": "dist/index.common.js",
@@ -43,7 +43,7 @@
     "@types/jest": "^29.5.12",
     "del-cli": "^5.1.0",
     "jest": "^29.7.0",
-    "rollup": "^4.10.0",
+    "rollup": "^4.12.0",
     "ts-jest": "^29.1.2",
     "tslib": "2.6.2",
     "typescript": "^5.3.3"
diff --git a/src/index.ts b/src/index.ts
index 7419c35..f074bd6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -83,8 +83,14 @@ export function calcAspectRatio(
         };
     }
 
-    const x = Math.round(ratio * 100) / 100;
-    const y = 1;
+    const divisor = gcd(width, height);
+    let x = width / divisor;
+    let y = height / divisor;
+
+    if (divisor === 1) {
+        x = Math.round(ratio * 100) / 100;
+        y = 1;
+    }
 
     return {
         x,
@@ -105,3 +111,11 @@ function findElement(elems: number[], value: number, tolerance: number) {
 
     return undefined;
 }
+
+function gcd(a = 0, b = 0) {
+    while (b) {
+        [a, b] = [b, a % b];
+    }
+
+    return a;
+}
diff --git a/test/index.test.ts b/test/index.test.ts
index b03e6eb..2b944b2 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -26,7 +26,8 @@ const resolutions: [string, string, number, number][] = [
     ['4K UHD', '16:9', 3840, 2160],
     ['high-end displays since 2017', '32:9', 5120, 1440],
     ['Advertisement displays', '4:1', 17280, 4320],
-    ['non standard', '142.99:1', 111100, 777],
+    ['non standard 1', '255:8', 10200, 320],
+    ['non standard 2', '33.37:1', 11111, 333],
 ];
 
 describe('Aspect ratio for display resolution', () => {