1diff --git a/src/RawFormulas.ts b/src/RawFormulas.ts
 2index 7aee389..e9172dc 100644
 3--- a/src/RawFormulas.ts
 4+++ b/src/RawFormulas.ts
 5@@ -198,7 +198,36 @@ var AND = function (...values) {
 6 };
 7 
 8 
 9-var ARABIC = Formula["ARABIC"];
10+/**
11+ * Computes the value of a Roman numeral.
12+ * @param text The Roman numeral to format, whose value must be between 1 and 3999, inclusive.
13+ * @returns {number} value in integer format
14+ * @constructor
15+ */
16+var ARABIC = function (text?) {
17+  checkArgumentsLength(arguments, 1);
18+  if (typeof text !== "string") {
19+    throw new CellError(ERRORS.VALUE_ERROR, 'Invalid roman numeral in ARABIC evaluation.');
20+  }
21+  var negative = false;
22+  if (text[0] === "-") {
23+    negative = true;
24+    text = text.substr(1);
25+  }
26+  // Credits: Rafa? Kukawski
27+  if (!/^M*(?:D?C{0,3}|C[MD])(?:L?X{0,3}|X[CL])(?:V?I{0,3}|I[XV])$/.test(text)) {
28+    throw new CellError(ERRORS.VALUE_ERROR, 'Invalid roman numeral in ARABIC evaluation.');
29+  }
30+  var r = 0;
31+  text.replace(/[MDLV]|C[MD]?|X[CL]?|I[XV]?/g, function (i) {
32+    r += {M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1}[i];
33+  });
34+  if (negative) {
35+    return r * -1;
36+  }
37+  return r;
38+};
39+
40 var ASIN = Formula["ASIN"];
41 var ASINH = Formula["ASINH"];
42 var ATAN = Formula["ATAN"];
43diff --git a/tests/FormulasTest.ts b/tests/FormulasTest.ts
44index f3dafd0..0b3f409 100644
45--- a/tests/FormulasTest.ts
46+++ b/tests/FormulasTest.ts
47@@ -106,7 +106,19 @@ catchAndAssertEquals(function() {
48 }, ERRORS.VALUE_ERROR);
49 
50 
51+// Test ARABIC
52 assertEquals(ARABIC("XIV"), 14);
53+assertEquals(ARABIC("M"), 1000);
54+assertEquals(ARABIC("-IV"), -4);
55+catchAndAssertEquals(function() {
56+  return ARABIC("b");
57+}, ERRORS.VALUE_ERROR);
58+catchAndAssertEquals(function() {
59+  return ARABIC(false);
60+}, ERRORS.VALUE_ERROR);
61+catchAndAssertEquals(function() {
62+  return ARABIC(10);
63+}, ERRORS.VALUE_ERROR);
64 
65 assertEquals(ASIN(0.1), 0.1001674211615598);
66