1diff --git a/src/RawFormulas/RawFormulas.ts b/src/RawFormulas/RawFormulas.ts
 2index ca2b8f1..63940ea 100644
 3--- a/src/RawFormulas/RawFormulas.ts
 4+++ b/src/RawFormulas/RawFormulas.ts
 5@@ -203,7 +203,24 @@ var __COMPLEX = {
 6 var FISHER = Formula["FISHER"];
 7 var FISHERINV = Formula["FISHERINV"];
 8 var IF = Formula["IF"];
 9-var ROUND = Formula["ROUND"];
10+
11+/**
12+ * Rounds a number to a certain number of decimal places according to standard rules.
13+ * @param values[0] The value to round to places number of places.
14+ * @param values[1] The number of decimal places to which to round.
15+ * @returns {number}
16+ * @constructor
17+ */
18+var ROUND = function (...values) {
19+  checkArgumentsAtWithin(values, 1, 2);
20+  var n = firstValueAsNumber(values[0]);
21+  if (values.length === 1) {
22+    return Math.round(n);
23+  }
24+  var d = firstValueAsNumber(values[1]);
25+  return Math.round(n * Math.pow(10, d)) / Math.pow(10, d);
26+};
27+
28 var ROUNDDOWN = Formula["ROUNDDOWN"];
29 var ROUNDUP = Formula["ROUNDUP"];
30 var SPLIT = Formula["SPLIT"];
31diff --git a/tests/FormulasTest.ts b/tests/FormulasTest.ts
32index c496deb..12806f6 100644
33--- a/tests/FormulasTest.ts
34+++ b/tests/FormulasTest.ts
35@@ -965,7 +965,20 @@ catchAndAssertEquals(function() {
36 }, ERRORS.NA_ERROR);
37 
38 
39+// Test ROUND
40 assertEquals(ROUND(99.44, 1), 99.4);
41+assertEquals(ROUND(99.44, 0), 99);
42+assertEquals(ROUND(99.4444444444444, 9), 99.444444444);
43+assertEquals(ROUND(99.44), 99);
44+assertEquals(ROUND("99.44"), 99);
45+assertEquals(ROUND([99.44, 22.222], [1, 4]), 99.4);
46+catchAndAssertEquals(function() {
47+  ROUND();
48+}, ERRORS.NA_ERROR);
49+catchAndAssertEquals(function() {
50+  ROUND(99.44, 1, 44);
51+}, ERRORS.NA_ERROR);
52+
53 
54 assertEquals(ROUNDDOWN(99.46, 1), 99.4);
55