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ISNUMBER
A medium data-check formula for testing what kind of value is in a cell before the next step runs.
Syntax
=ISNUMBER(...)Step-by-step explanation
- 1Understand the job that ISNUMBER solves before you type the formula.
- 2Build or select the cells and ranges that ISNUMBER needs before typing it.
- 3Check the output and refine the range or criteria if needed.
Common mistakes
Assuming the cell contains the type you expected
Using the wrong check for the data issue
Forgetting to wrap the check inside IF when needed
Example table
A quick scenario to connect the syntax to the result.
| 12 | 18 |
| 8 | 68 |
Formula
=ISNUMBER(A1:B2)
Result
68
Worked example
- 1Read the sample data first so you know what the formula needs to solve.
- 2Enter =ISNUMBER(A1:B2) in the result cell and press Enter.
- 3Check that the output matches 68.
Practice area
Use ISNUMBER when you need to validate the cell type before calculating or flagging a result.
Match against the syntax block above.