Exceljet

Quick, clean, and to the point

Calculate worksheets

Windows shortcut 
F9
Mac shortcut 
FnF9

This shortcut will calculate all worksheets in all open workbooks.

I think your website is great! It has helped me so much in learning to how to do things in Excel, please keep up the excellent work. -Stuart
Excel foundational video course
Excel Pivot Table video training course
Excel formulas and functions video training course
Excel Shortcuts Video Course
Excel Charts video training course