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How the two running-total approaches work
One formula with SCAN
SCAN applies a LAMBDA to each item in an array and returns the intermediate accumulated values. Microsoft’s current documentation lists it for Excel for Microsoft 365, Excel for the web, Excel 2024, and corresponding Mac editions. Check the versions your collaborators use before relying on it: Microsoft’s SCAN function documentation.
For a table named MonthlySales with a Sales column, Microsoft’s running-total example is:
=SCAN(0, MonthlySales[Sales], LAMBDA(accumulator, value, accumulator+value))
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The initial accumulator is zero; Excel adds each sales value to the accumulated total and returns the sequence. Enter the formula in one cell, and the results spill into the cells below. The structured reference makes the input column identifiable, but the destination area still needs enough clear space for the results.
Formulas copied down the rows
A conventional design makes each total depend on the previous total and the current input. If values start in A2, for example, enter =A2 in B2, then =B2+A3 in B3 and copy that formula down. Each row exposes the step in the calculation. When new input rows are added, the corresponding formulas also need to be present; a table setup may handle that extension for you.
Which is easier to maintain?
Choose based on the people who will own the workbook and how it is laid out. This comparison is practical guidance based on how the formulas work, not a Microsoft scoring system.
| Consideration | SCAN | Copied-down running total |
|---|---|---|
| Excel compatibility | Requires a version that supports SCAN; confirm collaborators’ versions. | Uses ordinary references and addition, so it is generally more compatible with older Excel versions. |
| Where the logic appears | One formula contains the accumulation rule. Maintainers need to understand LAMBDA. | Each row shows its calculation and link to the previous total. |
| Adding data | A structured table reference provides a readable source. Make sure the spilled output design accommodates added rows. | Formulas must extend into new rows unless the surrounding table setup fills them. |
| Auditing and troubleshooting | A short LAMBDA is compact; a long or nested formula can be harder to understand and debug. | The sequence is visible row by row, but copied formulas can be missed or drift from the intended pattern. |
| Calculation speed | No direct comparison established; test the actual workbook if speed matters. | No direct comparison established; test the actual workbook if speed matters. |
Use SCAN when its compactness helps your team
- Everyone who needs to edit or troubleshoot the workbook uses an Excel version with SCAN.
- Maintainers are comfortable reading a LAMBDA and prefer one place to inspect the accumulation rule.
- The output can spill into a clear, predictable area of the sheet.
- The LAMBDA can remain short and understandable. Microsoft cautions that complex “mega-formulas” can be harder to understand and debug, and recommends helper cells when they make intermediate calculations reusable: Microsoft’s LET guidance.
Use copied-down formulas when visibility or compatibility matters more
- The workbook must work in older Excel versions that do not support SCAN.
- Collaborators are more comfortable following ordinary cell references than reading LAMBDA.
- Showing each row’s contribution and dependency is useful for review or troubleshooting.
- The workbook already uses a table or another setup that reliably extends formulas to new rows.
Do not assume one calculates faster
Microsoft’s general calculation guidance discusses how formula cost depends on references and operations, but it does not compare SCAN with copied-down running totals. There is no direct benchmark here that establishes a speed winner. If recalculation time is the deciding factor, compare both patterns in the actual workbook and its real data context rather than choosing from the formula shape alone: Microsoft’s Excel calculation-performance guidance.
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