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diff --git a/date-fns/src/hoursToMilliseconds/index.ts b/date-fns/src/hoursToMilliseconds/index.ts
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+++ b/date-fns/src/hoursToMilliseconds/index.ts
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+import requiredArgs from '../_lib/requiredArgs/index'
+import { millisecondsInHour } from '../constants/index'
+
+/**
+ * @name hoursToMilliseconds
+ * @category  Conversion Helpers
+ * @summary Convert hours to milliseconds.
+ *
+ * @description
+ * Convert a number of hours to a full number of milliseconds.
+ *
+ * @param {number} hours - number of hours to be converted
+ *
+ * @returns {number} the number of hours converted to milliseconds
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // Convert 2 hours to milliseconds:
+ * const result = hoursToMilliseconds(2)
+ * //=> 7200000
+ */
+export default function hoursToMilliseconds(hours: number): number {
+  requiredArgs(1, arguments)
+  return Math.floor(hours * millisecondsInHour)
+}