diff --git a/types/ecma-proposal-math-extensions/ecma-proposal-math-extensions-tests.ts b/types/ecma-proposal-math-extensions/ecma-proposal-math-extensions-tests.ts
new file mode 100644
index 0000000000..3dc5a9d61a
--- /dev/null
+++ b/types/ecma-proposal-math-extensions/ecma-proposal-math-extensions-tests.ts
@@ -0,0 +1,7 @@
+import "ecma-proposal-math-extensions";
+
+Math.scale(42, 21, 64, 0, 100);
+Math.fscale(0.42, 0.21, 0.64, 0.0, 1.0);
+Math.clamp(42, 0, 100);
+Math.radians(180) === 180 * Math.DEG_PER_RAD;
+Math.degrees(Math.PI) === Math.PI * Math.RAD_PER_DEG;
diff --git a/types/ecma-proposal-math-extensions/index.d.ts b/types/ecma-proposal-math-extensions/index.d.ts
new file mode 100644
index 0000000000..6412e63dd6
--- /dev/null
+++ b/types/ecma-proposal-math-extensions/index.d.ts
@@ -0,0 +1,52 @@
+// Type definitions for ecma-proposal-math-extensions 0.0
+// Project: https://github.com/rwaldron/proposal-math-extensions#readme
+// Definitions by: Konstantin Simon Maria Möllers <https://github.com/ksm2>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.0
+
+interface Math {
+  /** This is the number of how many degrees are one radian. */
+  readonly DEG_PER_RAD: number;
+  /** This is the number of how many radians are one degree. */
+  readonly RAD_PER_DEG: number;
+  /**
+   * Scales a value between `inLow` and `inHigh` to the range of `outLow` to `outHigh`.
+   * @param x The numeric value in the input range to scale.
+   * @param inLow The lower bound of the input range.
+   * @param inHigh The upper bound of the input range.
+   * @param outLow The lower bound of the output range.
+   * @param outHigh The upper bound of the output range.
+   * @return The input value scaled to the output range.
+   */
+  scale(x: number, inLow: number, inHigh: number, outLow: number, outHigh: number): number;
+  /**
+   * Scales a floating point value between `inLow` and `inHigh` to the range of `outLow` to `outHigh`.
+   * @param x The numeric value in the input range to scale.
+   * @param inLow The lower bound of the input range.
+   * @param inHigh The upper bound of the input range.
+   * @param outLow The lower bound of the output range.
+   * @param outHigh The upper bound of the output range.
+   * @return The input value scaled to the output range.
+   */
+  fscale(x: number, inLow: number, inHigh: number, outLow: number, outHigh: number): number;
+  /**
+   * Clamps an incoming value `x` to a range between `lower` and `upper`.
+   * @param x The value to clamp.
+   * @param lower The lower bound of the range to clamp `x` to.
+   * @param upper The upper bound of the range to clamp `x` to.
+   * @return The input value clamped to the given range.
+   */
+  clamp(x: number, lower: number, upper: number): number;
+  /**
+   * Converts an angle given in degrees to an angle given in radians.
+   * @param degrees The input angle in degrees.
+   * @return The output angle in radians.
+   */
+  radians(degrees: number): number;
+  /**
+   * Converts an angle given in radians to an angle given in degrees.
+   * @param radians The input angle in radians.
+   * @return The output angle in degrees.
+   */
+  degrees(radians: number): number;
+}
diff --git a/types/ecma-proposal-math-extensions/tsconfig.json b/types/ecma-proposal-math-extensions/tsconfig.json
new file mode 100644
index 0000000000..52115765eb
--- /dev/null
+++ b/types/ecma-proposal-math-extensions/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "target": "es2017",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "ecma-proposal-math-extensions-tests.ts"
+    ]
+}
diff --git a/types/ecma-proposal-math-extensions/tslint.json b/types/ecma-proposal-math-extensions/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/ecma-proposal-math-extensions/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }