Manual calculations on a spreadsheet

Hi Carole, Thank you for your post, welcome to the forum, in answer to your question, Manual calculation? In the normal usage of a Workbook such as entering and calculalting values today's PC's usually have the calculating ability to handle. However large Workbooks which have multiple calculations which also cross workbooks (3D formulas) can slow down, some quite considerably so that each entry or calcualtion can take some time to complete. (If you have a 'steam' driven PC (much older) this can have a detrimental effect on your usage,) Switching to Manual Calculation will allow you to make all your entries new/edit without the hold up of 're-calculation' continuously happening. To apply Manual Calculaltion > Menu command Tool>Options choose the tab Calculation and select the Manual Operation option. Note the choices available. Click OK, if you wish to re-calculate your Worksheet press the F9 (Function 9) key at any time. I hope that has answered your question, Best regards Pete.