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REDUCE Function in Google Sheets: Syntax, Examples & Compatibility

Array Intermediate Google Sheets

Learn how to fold a range of values into one accumulated output using LAMBDA in Google Sheets. Includes syntax, two verified-by-reasoning results, troubleshooting and portability notes.

Verification status: Official documentation referenced; example outcomes independently reasoned or arithmetically checked where stated. Not executed in Google Sheets. How formula examples are checked

Quick answer: fold a range of values into one accumulated output using LAMBDA in Google Sheets. The reproducible examples below use explicit values so the formula’s meaning is testable without a large workbook.

Evidence: The function name and syntax are documented in the linked vendor function reference. Expected outputs were independently reasoned or checked outside the application. These are not native Google Sheets test results. A guide being published here does not certify every software release or file-import scenario.

Syntax and arguments

=REDUCE(initial_value, array_or_range, LAMBDA)

The LAMBDA accepts an accumulator and a current element; the final accumulator is the returned value.

Best use case: Fold a range of values into one accumulated output using LAMBDA.

Set up the example sheet

Enter A2=1, A3=2, and A4=3. These small numbers make it easy to verify that the accumulator carries forward.

Enter the formula in an unused cell. For a formula returning several values, leave an unobstructed area where those values can expand. These formulas use comma argument separators in a typical English-language locale; commas or semicolons inside quoted text are data, not argument separators. Adapt the separator if your regional settings require it.

Worked example 1: REDUCE with known input

=REDUCE(0,A2:A4,LAMBDA(total,x,total+x))

Expected output: 6.

The accumulator starts at 0 and visits 1, 2 and 3, ending at 6.

Worked example 2: a second REDUCE case

=REDUCE(1,A2:A4,LAMBDA(product,x,product*x))

Expected output: 6.

Multiplication starts at 1 and produces 1×1×2×3 = 6.

Compare both results before replacing literal values or short sample ranges with your own workbook data. For a spilling formula, compare every output cell, not only the top-left result.

Practical advice and troubleshooting

When this formula helps: REDUCE is designed for custom accumulation. SUM or PRODUCT is clearer when the task is simply adding or multiplying numbers.

Important edge case: Swapping the argument order of the accumulator and item can change non-commutative calculations. Set explicit initial values.

If the result differs, first verify the text-versus-number types of the input cells, the argument separators for your locale, and the range size. For dynamic arrays, inspect occupied cells in the output area. An error that looks like a missing function may reflect a software version rather than incorrect data.

Compatibility and version considerations

Excel and Sheets both have some lambda helper functions, but the exact supported function sets and versions are not identical.

Check your installed release for availability and dynamic-array support.

Function availability and parameter behavior must be judged for the specific application and release; a function documented in one spreadsheet does not automatically work in another.

Editorial verification: Vendor catalogue referenced as of 2026-10-12. The two example outputs are independently reasoned; no native application run, screenshot, or version-specific output is claimed. Review the editorial testing standards if you require stronger proof before importing a workbook.