Web Reference: May 13, 2024 · To allow only numbers in a cell, you can use data validation with a custom formula based on the ISNUMBER function. In the example shown, the data validation applied to C5:C9 is: =ISNUMBER (C5) Aug 8, 2025 · Learn how to set up data validation in Excel to allow only numbers. This guide covers step-by-step instructions to restrict input, ensuring accurate data entry. Apr 26, 2024 · Go to the Settings tab and select the option Custom from the Allow drop-down list. In the Formula field, insert the following formula: =ISNUMBER(C5:C9) This formula checks whether the values in the range C5 to C9 are numbers.
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