Cal11 calculator
Search calculator...

Vba Turn Off Auto Calculate

Reviewed by Calculator Editorial Team

Excel's Auto Calculate feature automatically recalculates formulas when data changes. While convenient, it can slow down performance in large workbooks or complex calculations. This guide explains how to disable Auto Calculate using VBA, when to do it, and its impact on workbook performance.

What is Auto Calculate?

Auto Calculate is Excel's default setting that automatically recalculates all formulas in a workbook whenever any cell value changes. This ensures formulas always show the most current results, but it can cause performance issues in large or complex workbooks.

Excel offers three calculation modes:

  • Automatic - Recalculates whenever data changes (default)
  • Manual - Only recalculates when you press F9 or click Calculate Now
  • Automatic except for tables - Recalculates automatically except for Excel Tables

Why Turn It Off?

Disabling Auto Calculate can significantly improve performance in these scenarios:

  • Large workbooks with thousands of formulas
  • Workbooks with volatile functions (NOW(), RAND(), INDIRECT())
  • Workbooks with complex calculations that don't need real-time updates
  • Workbooks being opened or saved frequently

Note: Disabling Auto Calculate means you'll need to manually trigger calculations when needed, which might not be ideal for all users.

How to Turn Off Auto Calculate

You can disable Auto Calculate through VBA using these methods:

Method 1: Set calculation to manual

Sub TurnOffAutoCalculate()
    Application.Calculation = xlCalculationManual
End Sub

This completely disables automatic recalculation until you manually trigger it.

Method 2: Set calculation to automatic except for tables

Sub SetCalculationForTables()
    Application.Calculation = xlCalculationAutomaticExceptTables
End Sub

This maintains automatic calculation for all formulas except those in Excel Tables.

When to use each method

Method Best for Performance impact
xlCalculationManual Large workbooks with complex calculations Best performance but requires manual calculation
xlCalculationAutomaticExceptTables Workbooks with Excel Tables that don't need constant updates Balanced approach with some automatic calculation

Performance Impact

Disabling Auto Calculate can provide these benefits:

  • Faster workbook opening and saving times
  • Reduced CPU usage during editing
  • Improved responsiveness in large workbooks

However, you'll need to manually trigger calculations when needed using:

  • F9 key
  • Calculate Now button on the Formulas tab
  • VBA code: Application.Calculate

Best Practices

When disabling Auto Calculate, follow these recommendations:

  1. Use xlCalculationManual for maximum performance in large workbooks
  2. Use xlCalculationAutomaticExceptTables if you need some automatic calculation
  3. Add a button to trigger calculations when needed
  4. Consider adding a status indicator showing when calculations are needed
  5. Test with different calculation modes to find the best balance

Pro Tip: You can combine this with other performance optimization techniques like disabling screen updating and events.

Frequently Asked Questions

Will disabling Auto Calculate break my workbook?

No, it won't break your workbook. You'll just need to manually trigger calculations when needed. All formulas will still work correctly when calculated.

Can I turn Auto Calculate back on later?

Yes, you can change the calculation mode back to automatic at any time using VBA or the Excel interface.

Does this affect Excel Tables?

With xlCalculationAutomaticExceptTables, Excel Tables will not automatically recalculate. With xlCalculationManual, they won't recalculate at all until you manually trigger a calculation.

Will this affect macros or VBA code?

No, this only affects how Excel handles automatic recalculation. Your macros and VBA code will continue to work normally.