Do I have 32-bit or 64-bit Excel?

Excel 2003 – 2007
Excel 2003 – 2007 is 32-bit

 

Excel 2010
1. Open Excel
2. Click File – Help
3. See picture.

about_excel2010

Excel 2013
1. Open Excel
2. Click File – Account – About Excel
3. See picture.

about_excel2013

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