A spreadsheet error can stop a piece of work even when the fix is only one missing bracket. AI can explain formulas, suggest a structure and help you find why a result looks wrong.
That does not make it safe to accept a formula you do not understand. The aim is to make the spreadsheet clearer, not hide another layer of complexity inside it.
Is the formula ready?
It works on the first row
Test more cases before copying it down.
It works on known answers, blanks and edge cases
That is much stronger evidence.
AI says the formula is correct
The spreadsheet result still needs testing.
Start with the smallest useful example
Do not upload a full customer or staff workbook when the problem concerns three columns.
Create a copy with invented names and a few representative rows. Keep the same column headings, data types and problem formula. Remove hidden sheets, comments and information the AI does not need.
This protects data and makes the problem easier to see.
Ask for an explanation before a replacement
If a formula fails, provide the formula, the intended result and one example row.
Explain this Excel formula in plain English, one part at a time. Then identify why it may return [error or wrong result]. Suggest the smallest correction and show how I can test it with the example values. Do not assume a column meaning that I have not supplied.
Understanding the existing formula helps you judge the change.
State the spreadsheet version and settings
Formula names and availability can vary between Excel, Google Sheets and other spreadsheet tools. Regional settings may also affect separators and dates.
Tell the AI which app you use. If a formula works in a demonstration but not in your file, check version, licence, table names, regional settings and cell formats.
Test with known answers
Before copying a formula down a full column, try rows where you already know the correct result.
Include awkward cases such as a blank cell, zero, a date at the end of a month or text where a number is expected. A formula that works on the first tidy row may fail on real data.
Use AI to find questions, not certify the figures
AI can point out duplicates, missing values or unusual results. It cannot confirm that the source data was collected correctly or that a figure means what the heading claims.
For budgets, payments, performance reports or other important work, use the organisation's normal checks and sign-off.
A simple spreadsheet workflow
- Describe the intended result.
- Share a safe sample.
- Ask for a plain-English explanation.
- Test the suggestion against known answers.
- Check edge cases.
- Save a copy before applying a large change.
Nova 9 view
AI is useful when it helps you understand the spreadsheet well enough to check it.
Use safe sample data, test known cases and avoid pasting a formula across thousands of rows simply because the first result looks right.
Sources and last checked
- Microsoft, Copilot in Excel FAQ: https://support.microsoft.com/en-us/excel/copilot/frequently-asked-questions-about-copilot-in-excel
- Microsoft, Excel help and learning: https://support.microsoft.com/en-us/excel
- Google, Google Sheets function list: https://support.google.com/docs/table/25273
- Last checked: 14 September 2026
