VBA & Macro Problems

Fix VBA Single Precision Errors by Using Double Data Type

Rana Garcia Oct 10, 2026 869 views

Question details

The user needs to resolve a precision discrepancy between VBA calculations using Single variables and worksheet SUM results.

Fix VBA Single Precision Errors by Using Double

Product: Excel / WPS Spreadsheet
Device & OS: not provided
Scenario: Calculating totals and performing math operations inside a VBA macro.
Observed behavior: VBA calculations produce a slightly different total compared to the worksheet SUM function due to the limited floating-point precision of the Single data type.

Before you start

Ensure you have access to the VBA Editor (ALT + F11) and locate the specific module where your numeric variables are currently declared.

Solution 1Recommended

Declare Calculation Variables as Double

Since worksheet numbers are natively stored with Double-level precision, updating VBA variables to Double eliminates precision loss and matches worksheet calculations.

The Single data type provides up to 7 digits of precision, which easily leads to floating-point rounding errors during accumulation or complex calculations. Changing variables to Double provides 15 significant digits, matching Excel's native precision.

Open the VBA Editor

Press ALT + F11 on your keyboard to launch the Visual Basic for Applications editor.

Locate Variable Declarations

Find the macro or module where your variables are declared. Look for statements using 'As Single', such as 'Dim myTotal As Single'.

Change Data Type to Double

Modify the declaration to use the Double data type. For example, change it to 'Dim myTotal As Double'.

Run and Verify

Save your code and rerun the macro. Compare the new output to the worksheet SUM result to confirm the precision discrepancy is resolved.

Best Practice: Always use the Double data type for financial, scientific, or highly precise calculations to mirror the native numeric precision of your spreadsheet.

Powerful Macro Support

Execute High-Precision VBA Macros in WPS Office

WPS Spreadsheet fully supports VBA macros, allowing you to use Double precision data types effortlessly. Run complex calculations with confidence, ensuring perfect alignment with worksheet functions just like in Microsoft Excel.

1. Open WPS Spreadsheet: Launch WPS Office and open your macro-enabled workbook.
2. Access the VBA Editor: Navigate to the Developer tab and click on 'Visual Basic', or simply press ALT + F11.
3. Update Variables: Change your numeric variables from Single to Double for accurate calculations.
4. Run the Macro: Execute your macro to enjoy fast, high-precision results.

Full compatibility with Microsoft Excel VBA syntax, objects, and data types.Native support for Double precision calculations to avoid rounding errors.Familiar Developer tab and VBA Editor interface for seamless transitions.Lightweight application with exceptional processing speed.

microsoft office alternative - wps office

Frequently Asked Questions

Why does the Single data type cause rounding errors in VBA?

The Single data type uses 32 bits to store floating-point numbers, offering only about 7 significant decimal digits. This limited precision often leads to slight rounding differences when numbers are added together or multiplied, especially when compared to native 64-bit spreadsheet calculations.

What is the primary difference between Single and Double in VBA?

Single is a 32-bit floating-point variable suitable for small decimals where precision is less critical. Double is a 64-bit variable offering up to 15 significant digits of precision, making it the industry standard for accurate financial and scientific mathematical calculations.

Does Excel use Single or Double natively for cell values?

Spreadsheet software natively stores and calculates numeric cell values using the Double precision (64-bit) floating-point format, adhering to the IEEE 754 standard. This is why using Double in VBA aligns perfectly with cell values.

Will changing Single to Double slow down my VBA macro?

No. Modern processors and operating systems are highly optimized for 64-bit calculations. You will not notice any performance degradation, and using Double is the recommended standard for handling decimals in VBA.

Excel & Data Problems