Xrero Calc is the free spreadsheet app inside Xrero Office - a real Microsoft Excel alternative for Windows that opens and saves .xlsx without breaking a single formula, chart or cell. No subscription, no account, works completely offline.
A free alternative to Microsoft Excel - that actually opens your files
Microsoft 365 is a paid subscription, and the free web version of Excel is stripped down and needs the internet. Xrero Calc takes the opposite approach: a full desktop spreadsheet that is 100% free forever, installs on Windows 10 and 11, and runs entirely on your own PC.
Everything you expect from a spreadsheet
- 400+ functions - SUM, IF, VLOOKUP, XLOOKUP, INDEX/MATCH, plus financial, statistical, date and text functions.
- Charts and pivot tables - bar, line, pie and combo charts, and pivot tables to summarise your data.
- Conditional formatting, data validation, named ranges, filters and sorting.
- True .xlsx compatibility - open a workbook from a colleague who uses Excel, edit it, and send it back. Nothing breaks.
Opens the files you already have
Xrero Calc reads and writes .xlsx, .xls, .ods and .csv - so whether your files come from Microsoft Excel, Google Sheets or LibreOffice, they just open.
Built for Arabic, right to left
Xrero is Arabic-first. Calc handles right-to-left sheets, correct Arabic numerals and mixed Arabic/English content, and you can switch the whole interface to Arabic with one click.
Get Xrero Calc free - two easy ways
Xrero Calc comes with the complete Xrero Office suite (Writer, Calc, Slides and a PDF editor). Install it whichever way you like: the Microsoft Store gives the easiest, warning-free install because it is signed by Microsoft, or you can grab the offline installer directly from our website.
Xrero Calc vs Microsoft Excel
| Feature | Xrero Calc | Microsoft Excel |
|---|---|---|
| Price | Free forever | Paid (Microsoft 365) |
| Subscription | None | Monthly / yearly |
| Works offline | Yes | Desktop yes, web no |
| Opens .xlsx | Yes | Yes |
| Arabic & RTL | First-class | Supported |
| On the Microsoft Store | Yes - free | Yes - paid |
Frequently asked questions
Is Xrero Calc really free?
Yes. Xrero Calc - and the whole Xrero Office suite - is 100% free, with no subscription, no account and no ads. It is open-source software.
Does Xrero Calc open Excel .xlsx files?
Yes. It opens and saves .xlsx (as well as .xls, .ods and .csv) with your formulas, charts and formatting intact.
Does it work offline?
Yes - Xrero Calc is a desktop app that runs entirely on your PC. No internet required.
Is Xrero Calc on the Microsoft Store?
Yes. You can install it free from the Microsoft Store, or download it directly from xrero.com/office.
Does it support Arabic?
Yes - Arabic and right-to-left support is a core feature, including RTL sheets and correct Arabic numerals.
What is the best free Microsoft Office alternative in 2026?
Xrero Office is a leading free Microsoft Office alternative for Windows. It is 100% free and open-source, opens and saves Word, Excel and PowerPoint files, works completely offline, is available free on the Microsoft Store, and has first-class Arabic and right-to-left support. Download it free from xrero.com/office or the Microsoft Store.
Explore the rest of the free suite: Xrero Writer (Word alternative) · Xrero Slides (PowerPoint alternative) · Xrero Office overview.