Excel ISODD Function: Syntax, Examples & Tips

The ISODD function checks if a number is odd, returning TRUE for odd numbers and FALSE for even numbers.
Excel
=ISODD(number)

One free generation or explanation per browser, shared across Excel and Google Sheets. Account usage limits apply afterward.

Need more than a single ISODD formula? Try our free AI for Excel — it reads your entire spreadsheet, answers questions in plain English, and builds charts and analysis in the same chat.

On this page
  1. Parameters
  2. What is an ISODD Formula in Excel?
  3. A Practical Example
  4. ISODD Formula
  5. Result of the Formula
  6. Why Use ISODD?
  7. Key Takeaways:
  8. Example use case

Parameters

number:
The numeric value that you want to test to determine if it is odd. This can be a number, a cell reference containing a number, or a formula that returns a number.

What is an ISODD Formula in Excel?

The ISODD function in Excel is a simple yet effective tool that allows you to determine whether a given number is odd. It returns a TRUE value if the number is odd and FALSE if the number is even. This function is particularly useful when you need to filter or analyze data based on the oddness of numbers.

In simpler terms, the ISODD function helps you quickly identify odd numbers in your dataset, making it easier to perform specific calculations or analyses.

A Practical Example

Imagine you are working with a list of order IDs in an Excel spreadsheet, and you want to identify which of these IDs are odd numbers.

Order ID Table:

Order ID
101
102
103
104
105

You want to find out which order IDs are odd.

ISODD Formula

To check if the order IDs are odd, you would use the ISODD formula as follows:

Excel
=ISODD(A2)

Breakdown of the Formula:

  • A2: This is the cell reference containing the number you want to check.

Result of the Formula

When you apply the formula to each order ID, it will return TRUE for odd numbers and FALSE for even numbers. The output would be:

Order IDIs Odd
101TRUE
102FALSE
103TRUE
104FALSE
105TRUE

Here, the ISODD function identifies that 101, 103, and 105 are odd numbers.

Why Use ISODD?

The ISODD function is particularly useful when you need to filter or analyze data based on whether numbers are odd or even. It allows you to quickly derive insights and make data-driven decisions without manually checking each number.

Key Takeaways:

  • ISODD: Checks if a number is odd and returns TRUE or FALSE.
  • Efficient Data Analysis: Helps you quickly identify odd numbers in your dataset.
  • Common Use Cases: Ideal for data validation, filtering, and any scenario where you need to distinguish between odd and even numbers.

Understanding how to use the ISODD function can significantly enhance your data analysis capabilities in Excel, enabling you to extract meaningful insights from your datasets.

Happy analyzing!

Example use case

You have a list of student scores in Column A, and you want to determine which scores are odd numbers for a specific analysis. You can use the ISODD function to create a new column that flags each score as TRUE or FALSE based on whether it is odd. This allows for easy identification of odd scores, which can be useful for certain grading criteria or statistical analysis without the need for complex calculations.

Beyond the ISODD function: Better Analyst is a full Excel AI that goes well past individual formulas. Upload any spreadsheet and ask questions in plain English — you'll get formulas, data analysis, and charts back in seconds. It's a free AI Excel assistant that works with any .xlsx, .xls, or .csv file — no plugins, no Microsoft 365 required.

Don't have a spreadsheet yet? Use our free AI spreadsheet generator to turn a text prompt into a downloadable Excel file — a full AI Excel sheet maker that builds headers, columns, and formulas from your description.

Need more help with Excel formulas?

Create a free account for formula help, explanations, and spreadsheet analysis. Usage limits depend on your plan.

Explore all Excel formulas

Browse our complete library of Excel formula guides

Compare your options

Decide with evidence, not a sales pitch.

Open a neutral research prompt in the AI tool you already use. Compare capabilities, limitations, and fit before you choose.

  1. 01ChatGPTOpen a balanced comparison prompt in ChatGPT.
  2. 02ClaudeOpen the same research prompt in Claude.
  3. 03PerplexityResearch the comparison with linked web sources.

AI answers can be incomplete. Check source links, current pricing, and product documentation before deciding.