1diff --git a/DOCS.md b/DOCS.md
  2index 2231bca..43c43fe 100644
  3--- a/DOCS.md
  4+++ b/DOCS.md
  5@@ -438,6 +438,15 @@
  6 @returns {number} 
  7 @constructor TODO: This function is based off of the open-source versions I was able to dig up online. We should implement a TODO:     second version that is closer to what MSExcel does and is named something like `ACCRINT.MS`.
  8 ```
  9+## Info
 10+
 11+
 12+### NA 
 13+
 14+```
 15+  Returns the "value not available" error, "#NA". 
 16+@constructor
 17+```
 18 ## Logical
 19 
 20 
 21diff --git a/TODO.md b/TODO.md
 22index bdb1c3b..cb52986 100644
 23--- a/TODO.md
 24+++ b/TODO.md
 25@@ -28,7 +28,6 @@ For example 64 tbs to a qt.
 26 * ISTEXT
 27 * ISURL
 28 * N
 29-* NA
 30 * TYPE
 31 * CELL
 32 * IFERROR
 33diff --git a/dist/Formulas/AllFormulas.js b/dist/Formulas/AllFormulas.js
 34index 6fa9dff..94e934d 100644
 35--- a/dist/Formulas/AllFormulas.js
 36+++ b/dist/Formulas/AllFormulas.js
 37@@ -64,6 +64,8 @@ exports.GTE = Math_1.GTE;
 38 exports.LT = Math_1.LT;
 39 exports.LTE = Math_1.LTE;
 40 exports.NE = Math_1.NE;
 41+var Info_1 = require("./Info");
 42+exports.NA = Info_1.NA;
 43 var Logical_1 = require("./Logical");
 44 exports.AND = Logical_1.AND;
 45 exports.EXACT = Logical_1.EXACT;
 46diff --git a/dist/Formulas/Info.js b/dist/Formulas/Info.js
 47new file mode 100644
 48index 0000000..a2ff652
 49--- /dev/null
 50+++ b/dist/Formulas/Info.js
 51@@ -0,0 +1,13 @@
 52+"use strict";
 53+exports.__esModule = true;
 54+var ArgsChecker_1 = require("../Utilities/ArgsChecker");
 55+var Errors_1 = require("../Errors");
 56+/**
 57+ * Returns the "value not available" error, "#N/A".
 58+ * @constructor
 59+ */
 60+var NA = function () {
 61+    ArgsChecker_1.ArgsChecker.checkLength(arguments, 1, "NA");
 62+    throw new Errors_1.NAError("NA Error thrown.");
 63+};
 64+exports.NA = NA;
 65diff --git a/src/Formulas/AllFormulas.ts b/src/Formulas/AllFormulas.ts
 66index 4ec5bf6..bc2e10c 100644
 67--- a/src/Formulas/AllFormulas.ts
 68+++ b/src/Formulas/AllFormulas.ts
 69@@ -63,6 +63,9 @@ import {
 70   LTE,
 71   NE
 72 } from "./Math";
 73+import {
 74+  NA
 75+} from "./Info";
 76 import {
 77   AND,
 78   EXACT,
 79@@ -291,5 +294,6 @@ export {
 80   GTE,
 81   LT,
 82   LTE,
 83-  NE
 84+  NE,
 85+  NA
 86 }
 87\ No newline at end of file
 88diff --git a/src/Formulas/Info.ts b/src/Formulas/Info.ts
 89new file mode 100644
 90index 0000000..d03c506
 91--- /dev/null
 92+++ b/src/Formulas/Info.ts
 93@@ -0,0 +1,25 @@
 94+import {
 95+  ArgsChecker
 96+} from "../Utilities/ArgsChecker";
 97+import {
 98+  NumError,
 99+  DivZeroError,
100+  RefError,
101+  ValueError,
102+  NAError
103+} from "../Errors";
104+
105+
106+/**
107+ * Returns the "value not available" error, "#N/A".
108+ * @constructor
109+ */
110+var NA = function () {
111+  ArgsChecker.checkLength(arguments, 1, "NA");
112+  throw new NAError("NA Error thrown.");
113+};
114+
115+
116+export {
117+  NA
118+}
119\ No newline at end of file
120diff --git a/tests/Formulas/InfoTest.ts b/tests/Formulas/InfoTest.ts
121new file mode 100644
122index 0000000..32bd4a0
123--- /dev/null
124+++ b/tests/Formulas/InfoTest.ts
125@@ -0,0 +1,15 @@
126+import {
127+  NA
128+} from "../../src/Formulas/Info";
129+import * as ERRORS from "../../src/Errors";
130+import {
131+  catchAndAssertEquals,
132+  test
133+} from "../Utils/Asserts";
134+
135+
136+test("NA", function(){
137+  catchAndAssertEquals(function() {
138+    NA();
139+  }, ERRORS.NA_ERROR);
140+});
141diff --git a/tests/SheetFormulaTest.ts b/tests/SheetFormulaTest.ts
142index d4616b3..7d56ccf 100644
143--- a/tests/SheetFormulaTest.ts
144+++ b/tests/SheetFormulaTest.ts
145@@ -5,7 +5,11 @@ import {
146   assertEquals,
147   test
148 } from "./Utils/Asserts";
149-import {DIV_ZERO_ERROR, VALUE_ERROR} from "../src/Errors";
150+import {
151+  DIV_ZERO_ERROR,
152+  VALUE_ERROR,
153+  NA_ERROR
154+} from "../src/Errors";
155 
156 function assertFormulaEqualsError(formula: string, errorString: string) {
157   var sheet  = new Sheet();
158@@ -590,6 +594,10 @@ test("Sheet WORKDAY.INTL", function(){
159   assertFormulaEquals('=WORKDAY.INTL(DATE(1999, 2, 2), 10)', 36207);
160 });
161 
162+test("Sheet NA", function(){
163+  assertFormulaEqualsError('=NA()', NA_ERROR);
164+});
165+
166 test("Sheet *", function(){
167   assertFormulaEquals('= 10 * 10', 100);
168   assertFormulaEquals('= 10 * 0', 0);