Home › Forums › General Issues › Populate Field Value with Sum of Two Other Fields › Reply To: Populate Field Value with Sum of Two Other Fields
There is a filter that runs when acf inserts or updates fields https://www.advancedcustomfields.com/resources/acf-save_post/
You would create a filter function and in this function get the values from the 2 fields and then update the 3rd field https://www.advancedcustomfields.com/resources/update_field/
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