VBA – Turn Automatic Calculations Off (or On)

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Whenever you update a cell, Excel goes through a process to recalculate the workbook. When working directly within Excel you want this to happen 99.9% of the time (the exception being if you are working with an extremely large workbook). However, this can really slow down your VBA code. It’s a good practice to set your calculations to manual at the begining of macros and restore calculations at the end of macros. If you need to recalculate the workbook you can manually tell Excel to calculate.

Turn Off Automatic Calculations

You can turn off automatic calculation with a macro by setting it to xlmanual. Use the following piece of VBA code:

Turn Automatic Calculations Back On

To turn on automatic calculation from VBA:

Manual Calculation

To force Excel to recalculate use this command:

You can also tell Excel to recalculate an individual worksheet:

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