{"id":177,"date":"2025-07-15T13:34:46","date_gmt":"2025-07-15T13:34:46","guid":{"rendered":"https:\/\/functiontranslator.com\/2021\/02\/12\/factdouble\/"},"modified":"2021-02-13T11:33:55","modified_gmt":"2021-02-13T11:33:55","slug":"factdouble","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/en\/factdouble\/","title":{"rendered":"FACTDOUBLE"},"content":{"rendered":"<p>Today, let&#8217;s delve into a highly useful mathematical function available in both Microsoft Excel and Google Sheets &#8211; FACTDOUBLE. This function calculates the double factorial of a number. A double factorial of a number n, denoted as n!!, is the product of all integers from 1 to n that share the same parity (either all odd or all even).<\/p>\n<h2>Syntax:<\/h2>\n<p>The syntax for the FACTDOUBLE function is identical in Microsoft Excel and Google Sheets:<\/p>\n<pre><code>=FACTDOUBLE(number)<\/code><\/pre>\n<h2>Examples:<\/h2>\n<p>To clarify how this function is used, let&#8217;s examine a few examples:<\/p>\n<h3>Example 1:<\/h3>\n<p>Calculate the double factorial for the number 5.<\/p>\n<table>\n<tr>\n<th>Excel Formula<\/th>\n<th>Result<\/th>\n<\/tr>\n<tr>\n<td>=FACTDOUBLE(5)<\/td>\n<td>15<\/td>\n<\/tr>\n<\/table>\n<p>Here, 5!! = 5 \u00d7 3 \u00d7 1 = 15.<\/p>\n<h3>Example 2:<\/h3>\n<p>Calculate the double factorial for the number 6.<\/p>\n<table>\n<tr>\n<th>Excel Formula<\/th>\n<th>Result<\/th>\n<\/tr>\n<tr>\n<td>=FACTDOUBLE(6)<\/td>\n<td>48<\/td>\n<\/tr>\n<\/table>\n<p>For this instance, 6!! = 6 \u00d7 4 \u00d7 2 = 48.<\/p>\n<h3>Example 3:<\/h3>\n<p>Employ the FACTDOUBLE function in a more complex formula.<\/p>\n<p>Imagine we want to calculate the sum of double factorials from 1 to 5.<\/p>\n<table>\n<tr>\n<th>Excel Formula<\/th>\n<th>Result<\/th>\n<\/tr>\n<tr>\n<td>=SUM(FACTDOUBLE(ROW(1:5)))<\/td>\n<td>49<\/td>\n<\/tr>\n<\/table>\n<p>In this scenario, we first generate an array {1, 2, 3, 4, 5} using the ROW function, calculate the double factorial for each element of the array, then sum these values to obtain 49.<\/p>\n<p>As the examples illustrate, the FACTDOUBLE function is an essential and versatile tool in both Excel and Google Sheets for computing double factorials and for its integration into more elaborate formulas.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Returns the double factorial of a number<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[198],"tags":[],"class_list":["post-177","post","type-post","status-publish","format-standard","hentry","category-math-and-trigonometry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Excel FACTDOUBLE Function \u2013 How It Works, Formula Examples and Syntax<\/title>\n<meta name=\"description\" content=\"Learn what the Excel FACTDOUBLE function does. 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