1diff --git a/DOCS.md b/DOCS.md
  2index 39503f2..99857f8 100644
  3--- a/DOCS.md
  4+++ b/DOCS.md
  5@@ -1365,6 +1365,15 @@
  6 @returns {number} 
  7 @constructor
  8 ```
  9+
 10+### PERCENT 
 11+
 12+```
 13+  Returns a value as a percentage where 100 is 1.0, and 0 is 0. 
 14+@param value - To convert. 
 15+@returns {number} 
 16+@constructor
 17+```
 18 ## Range
 19 
 20 
 21diff --git a/TODO.md b/TODO.md
 22index 472237c..ff4a55a 100644
 23--- a/TODO.md
 24+++ b/TODO.md
 25@@ -51,7 +51,6 @@ For example 64 tbs to a qt.
 26 * MULTINOMIAL
 27 * SERIESSUM
 28 * SUBTOTAL
 29-* UNARY_PERCENT
 30 * TO_DATE - Contingent upon cells having display formats derived from type-hierarchy
 31 * TO_DOLLARS - Contingent upon cells having display formats derived from type-hierarchy
 32 * TO_PERCENT - Contingent upon cells having display formats derived from type-hierarchy
 33diff --git a/dist/Formulas/AllFormulas.js b/dist/Formulas/AllFormulas.js
 34index 8511065..a115e5b 100644
 35--- a/dist/Formulas/AllFormulas.js
 36+++ b/dist/Formulas/AllFormulas.js
 37@@ -73,6 +73,7 @@ exports.UPLUS = Math_1.UPLUS;
 38 exports.UMINUS = Math_1.UMINUS;
 39 exports.MROUND = Math_1.MROUND;
 40 exports.FACTDOUBLE = Math_1.FACTDOUBLE;
 41+exports.UNARY_PERCENT = Math_1.UNARY_PERCENT;
 42 var Range_1 = require("./Range");
 43 exports.FREQUENCY = Range_1.FREQUENCY;
 44 exports.GROWTH = Range_1.GROWTH;
 45diff --git a/dist/Formulas/Math.js b/dist/Formulas/Math.js
 46index 9fddc50..228f8ac 100644
 47--- a/dist/Formulas/Math.js
 48+++ b/dist/Formulas/Math.js
 49@@ -1331,3 +1331,14 @@ var FACTDOUBLE = function (value) {
 50     }
 51 };
 52 exports.FACTDOUBLE = FACTDOUBLE;
 53+/**
 54+ * Returns a value as a percentage where 100 is 1.0, and 0 is 0.
 55+ * @param value - To convert.
 56+ * @returns {number}
 57+ * @constructor
 58+ */
 59+var UNARY_PERCENT = function (value) {
 60+    ArgsChecker_1.ArgsChecker.checkLength(arguments, 1, "UNARY_PERCENT");
 61+    return TypeConverter_1.TypeConverter.firstValueAsNumber(value) / 100;
 62+};
 63+exports.UNARY_PERCENT = UNARY_PERCENT;
 64diff --git a/src/Formulas/AllFormulas.ts b/src/Formulas/AllFormulas.ts
 65index ebe2932..6749708 100644
 66--- a/src/Formulas/AllFormulas.ts
 67+++ b/src/Formulas/AllFormulas.ts
 68@@ -70,7 +70,8 @@ import {
 69   UPLUS,
 70   UMINUS,
 71   MROUND,
 72-  FACTDOUBLE
 73+  FACTDOUBLE,
 74+  UNARY_PERCENT
 75 } from "./Math";
 76 import {
 77   FREQUENCY,
 78@@ -416,5 +417,6 @@ export {
 79   GEOMEAN,
 80   HARMEAN,
 81   CONFIDENCE,
 82-  N
 83+  N,
 84+  UNARY_PERCENT
 85 }
 86\ No newline at end of file
 87diff --git a/src/Formulas/Math.ts b/src/Formulas/Math.ts
 88index c00ed74..f9590af 100644
 89--- a/src/Formulas/Math.ts
 90+++ b/src/Formulas/Math.ts
 91@@ -1341,6 +1341,17 @@ var FACTDOUBLE = function (value) {
 92   }
 93 };
 94 
 95+/**
 96+ * Returns a value as a percentage where 100 is 1.0, and 0 is 0.
 97+ * @param value - To convert.
 98+ * @returns {number}
 99+ * @constructor
100+ */
101+var UNARY_PERCENT = function (value) {
102+  ArgsChecker.checkLength(arguments, 1, "UNARY_PERCENT");
103+  return TypeConverter.firstValueAsNumber(value) / 100;
104+};
105+
106 export {
107   ABS,
108   ACOS,
109@@ -1413,5 +1424,6 @@ export {
110   UPLUS,
111   UMINUS,
112   MROUND,
113-  FACTDOUBLE
114+  FACTDOUBLE,
115+  UNARY_PERCENT
116 }
117\ No newline at end of file
118diff --git a/tests/Formulas/MathTest.ts b/tests/Formulas/MathTest.ts
119index ab1a153..74f4eb4 100644
120--- a/tests/Formulas/MathTest.ts
121+++ b/tests/Formulas/MathTest.ts
122@@ -70,7 +70,8 @@ import {
123   UPLUS,
124   UMINUS,
125   MROUND,
126-  FACTDOUBLE
127+  FACTDOUBLE,
128+  UNARY_PERCENT
129 } from "../../src/Formulas/Math";
130 import * as ERRORS from "../../src/Errors";
131 import {
132@@ -1490,4 +1491,14 @@ test("SIGN", function(){
133   catchAndAssertEquals(function() {
134     SIGN.apply(this, [3, 2]);
135   }, ERRORS.NA_ERROR);
136+});
137+
138+
139+test("UNARY_PERCENT", function(){
140+  assertEquals(UNARY_PERCENT(100), 1);
141+  assertEquals(UNARY_PERCENT(2), 0.02);
142+  assertEquals(UNARY_PERCENT(0), 0);
143+  catchAndAssertEquals(function() {
144+    UNARY_PERCENT.apply(this, []);
145+  }, ERRORS.NA_ERROR);
146 });
147\ No newline at end of file
148diff --git a/tests/SheetFormulaTest.ts b/tests/SheetFormulaTest.ts
149index 636d9d5..c249510 100644
150--- a/tests/SheetFormulaTest.ts
151+++ b/tests/SheetFormulaTest.ts
152@@ -813,6 +813,10 @@ test("Sheet N", function(){
153   assertFormulaEquals('=N("10")', 10);
154 });
155 
156+test("Sheet UNARY_PERCENT", function(){
157+  assertFormulaEquals('=UNARY_PERCENT(10)', 0.1);
158+});
159+
160 test("Sheet *", function(){
161   assertFormulaEquals('= 10 * 10', 100);
162   assertFormulaEquals('= 10 * 0', 0);