diff --git a/package-lock.json b/package-lock.json
index 64e7baa0..da6a059d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1053,6 +1053,11 @@
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       "dev": true
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+    "bignumber.js": {
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+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-5.0.0.tgz",
+      "integrity": "sha512-KWTu6ZMVk9sxlDJQh2YH1UOnfDP8O8TpxUxgQG/vKASoSnEjK9aVuOueFaPcQEYQ5fyNXNTOYwYw3099RYebWg=="
+    },
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       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.11.0.tgz",
@@ -1407,7 +1412,6 @@
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@@ -3334,910 +3338,6 @@
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-          "dev": true,
-          "requires": {
-            "hoek": "2.16.3"
-          }
-        },
-        "sshpk": {
-          "version": "1.13.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "asn1": "0.2.3",
-            "assert-plus": "1.0.0",
-            "bcrypt-pbkdf": "1.0.1",
-            "dashdash": "1.14.1",
-            "ecc-jsbn": "0.1.1",
-            "getpass": "0.1.7",
-            "jodid25519": "1.0.2",
-            "jsbn": "0.1.1",
-            "tweetnacl": "0.14.5"
-          },
-          "dependencies": {
-            "assert-plus": {
-              "version": "1.0.0",
-              "bundled": true,
-              "dev": true,
-              "optional": true
-            }
-          }
-        },
-        "string-width": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
-          }
-        },
-        "string_decoder": {
-          "version": "1.0.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "safe-buffer": "5.0.1"
-          }
-        },
-        "stringstream": {
-          "version": "0.0.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "ansi-regex": "2.1.1"
-          }
-        },
-        "strip-json-comments": {
-          "version": "2.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "tar": {
-          "version": "2.2.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "block-stream": "0.0.9",
-            "fstream": "1.0.11",
-            "inherits": "2.0.3"
-          }
-        },
-        "tar-pack": {
-          "version": "3.4.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "debug": "2.6.8",
-            "fstream": "1.0.11",
-            "fstream-ignore": "1.0.5",
-            "once": "1.4.0",
-            "readable-stream": "2.2.9",
-            "rimraf": "2.6.1",
-            "tar": "2.2.1",
-            "uid-number": "0.0.6"
-          }
-        },
-        "tough-cookie": {
-          "version": "2.3.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "punycode": "1.4.1"
-          }
-        },
-        "tunnel-agent": {
-          "version": "0.6.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "safe-buffer": "5.0.1"
-          }
-        },
-        "tweetnacl": {
-          "version": "0.14.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "uid-number": {
-          "version": "0.0.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "util-deprecate": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        },
-        "uuid": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "verror": {
-          "version": "1.3.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "extsprintf": "1.0.2"
-          }
-        },
-        "wide-align": {
-          "version": "1.1.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "string-width": "1.0.2"
-          }
-        },
-        "wrappy": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        }
-      }
-    },
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -6462,13 +5562,6 @@
       "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=",
       "dev": true
     },
-    "nan": {
-      "version": "2.8.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.8.0.tgz",
-      "integrity": "sha1-7XFfP+neArV6XmJS2QqWZ14fCFo=",
-      "dev": true,
-      "optional": true
-    },
     "natural-compare": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/natural-compare/-/natural-compare-1.4.0.tgz",
diff --git a/package.json b/package.json
index 3c80af60..8a686708 100644
--- a/package.json
+++ b/package.json
@@ -68,6 +68,7 @@
   },
   "dependencies": {
     "babel-polyfill": "^6.26.0",
+    "bignumber.js": "^5.0.0",
     "bootstrap": "^3.3.7",
     "bootstrap-colorpicker": "^2.5.2",
     "bootstrap-switch": "^3.3.4",
diff --git a/src/core/Dish.js b/src/core/Dish.js
index 001f78e1..d5f2c492 100755
--- a/src/core/Dish.js
+++ b/src/core/Dish.js
@@ -1,14 +1,16 @@
 import Utils from "./Utils.js";
+import BigNumber from "bignumber.js";
 
 /**
  * The data being operated on by each operation.
  *
  * @author n1474335 [n1474335@gmail.com]
+ * @author Matt C [matt@artemisbot.uk]
  * @copyright Crown Copyright 2016
  * @license Apache-2.0
  *
  * @class
- * @param {byteArray|string|number|ArrayBuffer} value - The value of the input data.
+ * @param {byteArray|string|number|ArrayBuffer|BigNumber} value - The value of the input data.
  * @param {number} type - The data type of value, see Dish enums.
  */
 const Dish = function(value, type) {
@@ -47,6 +49,12 @@ Dish.HTML = 3;
  * @enum
  */
 Dish.ARRAY_BUFFER = 4;
+/**
+ * Dish data type enum for BigNumbers.
+ * @readonly
+ * @enum
+ */
+Dish.BIG_NUMBER = 5;
 
 
 /**
@@ -57,22 +65,22 @@ Dish.ARRAY_BUFFER = 4;
  * @returns {number} The data type enum value.
  */
 Dish.typeEnum = function(typeStr) {
-    switch (typeStr) {
-        case "byteArray":
-        case "Byte array":
+    switch (typeStr.toLowerCase()) {
+        case "bytearray":
+        case "byte array":
             return Dish.BYTE_ARRAY;
         case "string":
-        case "String":
             return Dish.STRING;
         case "number":
-        case "Number":
             return Dish.NUMBER;
         case "html":
-        case "HTML":
             return Dish.HTML;
-        case "arrayBuffer":
-        case "ArrayBuffer":
+        case "arraybuffer":
+        case "array buffer":
             return Dish.ARRAY_BUFFER;
+        case "bignumber":
+        case "big number":
+            return Dish.BIG_NUMBER;
         default:
             throw "Invalid data type string. No matching enum.";
     }
@@ -83,8 +91,8 @@ Dish.typeEnum = function(typeStr) {
  * Returns the data type string for the given type enum.
  *
  * @static
- * @param {string} typeEnum - The enum value of the data type.
- * @returns {number} The data type as a string.
+ * @param {number} typeEnum - The enum value of the data type.
+ * @returns {string} The data type as a string.
  */
 Dish.enumLookup = function(typeEnum) {
     switch (typeEnum) {
@@ -98,6 +106,8 @@ Dish.enumLookup = function(typeEnum) {
             return "html";
         case Dish.ARRAY_BUFFER:
             return "ArrayBuffer";
+        case Dish.BIG_NUMBER:
+            return "BigNumber";
         default:
             throw "Invalid data type enum. No matching type.";
     }
@@ -107,7 +117,7 @@ Dish.enumLookup = function(typeEnum) {
 /**
  * Sets the data value and type and then validates them.
  *
- * @param {byteArray|string|number|ArrayBuffer} value - The value of the input data.
+ * @param {byteArray|string|number|ArrayBuffer|BigNumber} value - The value of the input data.
  * @param {number} type - The data type of value, see Dish enums.
  */
 Dish.prototype.set = function(value, type) {
@@ -126,7 +136,7 @@ Dish.prototype.set = function(value, type) {
  * Returns the value of the data in the type format specified.
  *
  * @param {number} type - The data type of value, see Dish enums.
- * @returns {byteArray|string|number|ArrayBuffer} The value of the output data.
+ * @returns {byteArray|string|number|ArrayBuffer|BigNumber} The value of the output data.
  */
 Dish.prototype.get = function(type) {
     if (this.type !== type) {
@@ -159,6 +169,9 @@ Dish.prototype.translate = function(toType) {
             // Array.from() would be nicer here, but it's slightly slower
             this.value = Array.prototype.slice.call(new Uint8Array(this.value));
             break;
+        case Dish.BIG_NUMBER:
+            this.value = this.value instanceof BigNumber ? Utils.strToByteArray(this.value.toString()) : [];
+            break;
         default:
             break;
     }
@@ -180,6 +193,10 @@ Dish.prototype.translate = function(toType) {
             this.value = new Uint8Array(this.value).buffer;
             this.type = Dish.ARRAY_BUFFER;
             break;
+        case Dish.BIG_NUMBER:
+            this.value = new BigNumber(Utils.byteArrayToUtf8(this.value));
+            this.type = Dish.BIG_NUMBER;
+            break;
         default:
             break;
     }
@@ -215,6 +232,8 @@ Dish.prototype.valid = function() {
             return typeof this.value === "number";
         case Dish.ARRAY_BUFFER:
             return this.value instanceof ArrayBuffer;
+        case Dish.BIG_NUMBER:
+            return this.value instanceof BigNumber;
         default:
             return false;
     }
@@ -235,6 +254,7 @@ Dish.prototype.size = function() {
         case Dish.HTML:
             return this.value.length;
         case Dish.NUMBER:
+        case Dish.BIG_NUMBER:
             return this.value.toString().length;
         case Dish.ARRAY_BUFFER:
             return this.value.byteLength;
diff --git a/src/core/config/OperationConfig.js b/src/core/config/OperationConfig.js
index 835fa2d8..ccd6a62f 100755
--- a/src/core/config/OperationConfig.js
+++ b/src/core/config/OperationConfig.js
@@ -806,7 +806,7 @@ const OperationConfig = {
         module: "Default",
         description: "Converts a number to decimal from a given numerical base.",
         inputType: "string",
-        outputType: "number",
+        outputType: "BigNumber",
         args: [
             {
                 name: "Radix",
@@ -818,7 +818,7 @@ const OperationConfig = {
     "To Base": {
         module: "Default",
         description: "Converts a decimal number to a given numerical base.",
-        inputType: "number",
+        inputType: "BigNumber",
         outputType: "string",
         args: [
             {
diff --git a/src/core/operations/Base.js b/src/core/operations/Base.js
index 8a79bf3b..372a815b 100755
--- a/src/core/operations/Base.js
+++ b/src/core/operations/Base.js
@@ -1,3 +1,4 @@
+import BigNumber from "bignumber.js";
 /**
  * Numerical base operations.
  *
@@ -18,7 +19,7 @@ const Base = {
     /**
      * To Base operation.
      *
-     * @param {number} input
+     * @param {BigNumber} input
      * @param {Object[]} args
      * @returns {string}
      */
@@ -39,7 +40,7 @@ const Base = {
      *
      * @param {string} input
      * @param {Object[]} args
-     * @returns {number}
+     * @returns {BigNumber}
      */
     runFrom: function(input, args) {
         const radix = args[0] || Base.DEFAULT_RADIX;
@@ -48,14 +49,14 @@ const Base = {
         }
 
         let number = input.replace(/\s/g, "").split("."),
-            result = parseInt(number[0], radix) || 0;
+            result = new BigNumber(number[0], radix) || 0;
 
         if (number.length === 1) return result;
 
         // Fractional part
         for (let i = 0; i < number[1].length; i++) {
-            const digit = parseInt(number[1][i], radix);
-            result += digit / Math.pow(radix, i+1);
+            const digit = new BigNumber(number[1][i], radix);
+            result += digit.div(Math.pow(radix, i+1));
         }
 
         return result;