To disable automatic calculation for a specific workbook in Excel, you need to set the calculation option to "Manual." Here's how:
- Open the Excel workbook where you want to disable auto calculate.
- Go to the "Formulas" tab on the Excel ribbon.
- In the "Calculation" group, click on "Calculation Options."
- Select "Manual."
Now, Excel will no longer automatically recalculate formulas in this workbook whenever data changes.
Recalculating Manually
When calculation is set to manual, you will need to recalculate the formulas yourself. Here are a few ways to do that:
- Press the "F9" key. This will recalculate all formulas in all open workbooks.
- Press "Shift + F9". This will recalculate the active worksheet only.
- Click "Calculate Now" or "Calculate Sheet": In the "Formulas" tab, in the "Calculation" group, you can click these buttons to trigger calculation. "Calculate Now" (equivalent to F9) recalculates all open workbooks, and "Calculate Sheet" (equivalent to Shift + F9) recalculates the active sheet.
- Temporarily switch to Automatic: You can temporarily switch back to "Automatic" calculation, which will recalculate everything and then you can switch back to "Manual."
Important Considerations:
- Workbook Specific: These settings are specific to the currently open workbook. Other workbooks will retain their own calculation settings (either automatic or manual).
- Saving the Workbook: When you save the workbook, the calculation setting (manual or automatic) is saved with it. When you re-open the workbook, it will use the saved setting.
- Formulas not updating: Remember that with manual calculation enabled, your formulas won't update automatically when you change data. You must trigger a recalculation to see the updated results.
