XNUMBERS is a multi-precision

floating point In computing, floating-point arithmetic (FP) is arithmetic on subsets of real numbers formed by a ''significand'' (a signed sequence of a fixed number of digits in some base) multiplied by an integer power of that base. Numbers of this form ...

computing and

numerical methods Numerical analysis is the study of algorithms that use numerical approximation (as opposed to symbolic manipulations) for the problems of mathematical analysis (as distinguished from discrete mathematics). It is the study of numerical methods t ...

library for

Microsoft Excel Microsoft Excel is a spreadsheet editor developed by Microsoft for Microsoft Windows, Windows, macOS, Android (operating system), Android, iOS and iPadOS. It features calculation or computation capabilities, graphing tools, pivot tables, and a ...

. Xnumbers claims to be an open source Excel addin (xla), the license however is not an open source license. XNUMBERS performs multi-precision floating point arithmetic from 15 up to 200

significant digits Significant figures, also referred to as significant digits, are specific digits within a number that is written in positional notation that carry both reliability and necessity in conveying a particular quantity. When presenting the outcom ...

. The version 5.6 as of 2008 is compatible with Excel 2003/XP and consists of a set of more than 300 functions for arithmetic, complex, trigonometric, logarithm, exponential calculus. The Foxes team members (around Leonardo Volpi) stopped their development efforts in 2008. Recently, an American astronomer had his brother John Beyers make the Italian versions compatible to recent versions of Microsoft Excel/Windows/VisualBasic. Several forked versions are made available in the last section of the astronomer's homepage, entitled "Downloads and links".

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XNUMBERS 6.0.5.6 for Excel
- John Beyers, last update 11 Dec 2013
XNUMBERS 5.6 for Excel
- Foxes Team Microsoft Office {{Science-software-stub