ISODD Function in Excel: Is the Number Odd?

ISODD Function in Excel: Is the Number Odd? featured illustration

📎 This article includes 1 downloadable practice file ↓

⏱ 2 min readUpdated 28 September 2026

InformationLevel: BeginnerAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. ISODD in practice
  5. Where you will use it
  6. Worked example
  7. Mistakes people make
  8. Related functions
  9. Continue learning

ISODD returns TRUE for odd numbers (decimals are truncated first).

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Syntax

=ISODD(number)
Argument What it means
number A number.

Examples

Example 1

=ISODD(ROW())

Conditional-format rule for zebra rows.

ISODD in practice

Where you will use it

  • Odd/even house numbers for route planning
  • Banding rows
  • Simple checks on quantities

Worked example

NumberFormulaResult
4=ISODD(A2)FALSE
7=ISODD(A3)TRUE
-3=ISODD(A4)TRUE

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
DecimalsTruncated before testing
Blank cellsBlank counts as 0, which is even

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📎 Practice files for this article

  • 📗
    Practice workbook: Information (IS…) functions15 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.
    ⬇ XLSX · 34 KB

Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.

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