1diff --git a/DOCS.md b/DOCS.md
  2index a7842f6..66067ae 100644
  3--- a/DOCS.md
  4+++ b/DOCS.md
  5@@ -2079,6 +2079,17 @@
  6 @returns {number} 
  7 @constructor
  8 ```
  9+
 10+### RANK 
 11+
 12+```
 13+  Returns the position of a given entry in the entire list, measured either from top to bottom or bottom to top. 
 14+@param value - Value to find the rank of. 
 15+@param data - Values or range of the data-set. 
 16+@param isAscending - [OPTIONAL] The type of rank: 0 to rank from the highest, 1 to rank from the lowest. Defaults to 0. 
 17+@returns {number} 
 18+@constructor
 19+```
 20 ## Text
 21 
 22 
 23diff --git a/TODO.md b/TODO.md
 24index 85605ed..a1bf6b5 100644
 25--- a/TODO.md
 26+++ b/TODO.md
 27@@ -65,7 +65,6 @@ Many of these formulas can be written by allowing the Sheet and Parser to return
 28 * HYPGEOMDIST
 29 * LOGINV
 30 * LOGNORMDIST
 31-* RANK
 32 * RANK.AVG
 33 * RANK.EQ
 34 * T.INV
 35diff --git a/dist/Formulas/AllFormulas.js b/dist/Formulas/AllFormulas.js
 36index 232bd48..90b6b95 100644
 37--- a/dist/Formulas/AllFormulas.js
 38+++ b/dist/Formulas/AllFormulas.js
 39@@ -193,6 +193,7 @@ exports.SKEW = Statistical_1.SKEW;
 40 exports.STEYX = Statistical_1.STEYX;
 41 exports.PROB = Statistical_1.PROB;
 42 exports.MODE = Statistical_1.MODE;
 43+exports.RANK = Statistical_1.RANK;
 44 var Text_1 = require("./Text");
 45 exports.ARABIC = Text_1.ARABIC;
 46 exports.CHAR = Text_1.CHAR;
 47diff --git a/dist/Formulas/Statistical.js b/dist/Formulas/Statistical.js
 48index 651d5a2..b8b1cef 100644
 49--- a/dist/Formulas/Statistical.js
 50+++ b/dist/Formulas/Statistical.js
 51@@ -1862,3 +1862,30 @@ var MODE = function () {
 52     return maxItems[0];
 53 };
 54 exports.MODE = MODE;
 55+/**
 56+ * Returns the position of a given entry in the entire list, measured either from top to bottom or bottom to top.
 57+ * @param value - Value to find the rank of.
 58+ * @param data - Values or range of the data-set.
 59+ * @param isAscending - [OPTIONAL] The type of rank: 0 to rank from the highest, 1 to rank from the lowest. Defaults to
 60+ * 0.
 61+ * @returns {number}
 62+ * @constructor
 63+ */
 64+var RANK = function (value, data, isAscending) {
 65+    ArgsChecker_1.ArgsChecker.checkLengthWithin(arguments, 2, 3, "RANK");
 66+    value = TypeConverter_1.TypeConverter.firstValueAsNumber(value);
 67+    var range = Filter_1.Filter.flattenAndThrow(data).map(TypeConverter_1.TypeConverter.valueToNumber);
 68+    isAscending = (typeof isAscending === 'undefined') ? false : isAscending;
 69+    var sort = (isAscending) ? function (a, b) {
 70+        return a - b;
 71+    } : function (a, b) {
 72+        return b - a;
 73+    };
 74+    range = range.sort(sort);
 75+    var rangeIndex = range.indexOf(value);
 76+    if (rangeIndex === -1) {
 77+        throw new Errors_1.NAError("RANK can't produce a result because parameter 1 is not in the dataset.");
 78+    }
 79+    return range.indexOf(value) + 1;
 80+};
 81+exports.RANK = RANK;
 82diff --git a/src/Formulas/AllFormulas.ts b/src/Formulas/AllFormulas.ts
 83index 2a033c8..fbffeff 100644
 84--- a/src/Formulas/AllFormulas.ts
 85+++ b/src/Formulas/AllFormulas.ts
 86@@ -198,7 +198,8 @@ import {
 87   SKEW,
 88   STEYX,
 89   PROB,
 90-  MODE
 91+  MODE,
 92+  RANK
 93 } from "./Statistical";
 94 import {
 95   ARABIC,
 96@@ -471,5 +472,6 @@ export {
 97   SKEW,
 98   STEYX,
 99   PROB,
100-  MODE
101+  MODE,
102+  RANK
103 }
104\ No newline at end of file
105diff --git a/src/Formulas/Statistical.ts b/src/Formulas/Statistical.ts
106index 6abae9b..5b12993 100644
107--- a/src/Formulas/Statistical.ts
108+++ b/src/Formulas/Statistical.ts
109@@ -1842,6 +1842,34 @@ var MODE =  function (...values) {
110 };
111 
112 
113+/**
114+ * Returns the position of a given entry in the entire list, measured either from top to bottom or bottom to top.
115+ * @param value - Value to find the rank of.
116+ * @param data - Values or range of the data-set.
117+ * @param isAscending - [OPTIONAL] The type of rank: 0 to rank from the highest, 1 to rank from the lowest. Defaults to
118+ * 0.
119+ * @returns {number}
120+ * @constructor
121+ */
122+var RANK = function (value, data, isAscending?) {
123+  ArgsChecker.checkLengthWithin(arguments, 2, 3, "RANK");
124+  value = TypeConverter.firstValueAsNumber(value);
125+  var range = Filter.flattenAndThrow(data).map(TypeConverter.valueToNumber);
126+  isAscending = (typeof isAscending === 'undefined') ? false : isAscending;
127+  var sort = (isAscending) ? function (a, b) {
128+    return a - b;
129+  } : function (a, b) {
130+    return b - a;
131+  };
132+  range = range.sort(sort);
133+  var rangeIndex = range.indexOf(value);
134+  if (rangeIndex === -1) {
135+    throw new NAError("RANK can't produce a result because parameter 1 is not in the dataset.");
136+  }
137+  return range.indexOf(value) + 1;
138+};
139+
140+
141 export {
142   AVERAGE,
143   AVERAGEA,
144@@ -1899,5 +1927,6 @@ export {
145   SKEW,
146   STEYX,
147   PROB,
148-  MODE
149+  MODE,
150+  RANK
151 }
152\ No newline at end of file
153diff --git a/tests/Formulas/StatisticalTest.ts b/tests/Formulas/StatisticalTest.ts
154index 1b446a5..d11c21a 100644
155--- a/tests/Formulas/StatisticalTest.ts
156+++ b/tests/Formulas/StatisticalTest.ts
157@@ -55,7 +55,8 @@ import {
158   SKEW,
159   STEYX,
160   PROB,
161-  MODE
162+  MODE,
163+  RANK
164 } from "../../src/Formulas/Statistical";
165 import * as ERRORS from "../../src/Errors";
166 import {
167@@ -1128,4 +1129,18 @@ test("MODE", function() {
168   catchAndAssertEquals(function() {
169     MODE();
170   }, ERRORS.NA_ERROR);
171+});
172+
173+test("RANK", function() {
174+  assertEquals(RANK(2, [1, 2, 3, 4, 5, 6, 7, 8, 9], true), 2);
175+  assertEquals(RANK(2, [7, 1, 2, 4, 100, 8, 9], true), 2);
176+  catchAndAssertEquals(function() {
177+    RANK(44, [7, 1]);
178+  }, ERRORS.NA_ERROR);
179+  catchAndAssertEquals(function() {
180+    RANK.apply(this, [44]);
181+  }, ERRORS.NA_ERROR);
182+  catchAndAssertEquals(function() {
183+    RANK.apply(this, [44, [7, 1], true, false]);
184+  }, ERRORS.NA_ERROR);
185 });
186\ No newline at end of file
187diff --git a/tests/SheetFormulaTest.ts b/tests/SheetFormulaTest.ts
188index 9c5419f..cda030d 100644
189--- a/tests/SheetFormulaTest.ts
190+++ b/tests/SheetFormulaTest.ts
191@@ -930,6 +930,10 @@ test("Sheet MODE", function(){
192   assertFormulaEquals('=MODE(1, 6, 7, 7, 8)', 7);
193 });
194 
195+test("Sheet RANK", function(){
196+  assertFormulaEquals('=RANK([2], [1, 2, 3, 4, 5, 6, 7, 8, 9], true)', 2);
197+});
198+
199 test("Sheet *", function(){
200   assertFormulaEquals('= 10 * 10', 100);
201   assertFormulaEquals('= 10 * 0', 0);