Sum by month from dates
Prompt includes sample dates in B and amounts in C, asks for total for month in E1 using SUMIFS, and specifies the month cell reference style you want.
How do you prompt AI for Google Sheets formulas?
A good prompt describes your column layout, sample values, expected result, and Google Sheets functions you prefer. Vague asks like "make a formula" produce fragile ARRAYFORMULA guesses. Treat AI output as a draft you test in a copy tab before pasting into production.
When to use it
Use AI prompts when you know the outcome but not the syntax: nested IFs, QUERY strings, regex extractions, or translating Excel formulas to Sheets dialect.
When to skip it
Skip AI for one-line SUM you can type faster yourself, or for compliance logic you cannot explain without an auditor reviewing the exact function tree.
How it works
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1
{:"Describe columns with letters and header names"=>"Column B has dates, column C has amounts."}
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2
Paste two to three example rows and the desired output row for each.
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3
{:"State constraints"=>"no helper column, spill allowed, locale uses semicolons if relevant."}
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Ask for step-by-step explanation so you can fix ranges when rows grow.
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{:"Paste the formula in an empty column on a test sheet and edge cases"=>"blanks, zeros, text dates."}
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{:Iterate=>"tell the model what error or wrong value you see (#REF!, off by one row)."}
Examples in Google Sheets
Extract domain from email
Give three email samples and ask for REGEXEXTRACT or SPLIT formula that returns example.com only.
Mark duplicates across two sheets
Describe Sheet1 column A and Sheet2 column D keys, ask for COUNTIF or MATCH formula flagging missing in Sheet2.
Build this without starting from a blank cell
Use a Better Sheets tool for AI prompts for formulas, then watch a walkthrough when you want the full pattern.
Better Sheets resources
Common mistakes
- No sample data, so the model invents column names that do not exist in your file.
- Accepting Excel-only functions without checking Sheets support (e.g., some lookup variants differ).
- Pasting AI formulas that use comma separators in locales that require semicolons.
- Trusting totals on full columns without testing blank rows and headers included by mistake.
- Sharing sensitive real customer rows in public AI tools against company policy.
Frequently asked questions
- ChatGPT vs Gemini for Sheets?
- Both can draft formulas. Gemini inside Google Workspace may see less copy-paste friction, but you still must verify logic.
- Should I ask for ARRAYFORMULA?
- Say whether you want one formula for the whole column or row-by-row drag. Spill behavior differs in modern Sheets.
- How do I fix
- Check sheet names in quotes, ranges that moved, and IMPORTRANGE permissions the model cannot see.
- Can AI write Apps Script too?
- Yes, but script needs authorization and testing. Start with formulas unless you need triggers or mail.
- What if the formula is almost right?
- Reply with the wrong output cell and expected value; smaller iterations beat rewriting the whole prompt.
- Are AI formulas safe to share?
- Remove proprietary data from prompts. The formula itself is usually fine to share; the prompt may not be.
- Can I prompt for conditional formatting rules?
- Yes. Include the range size and whether custom formula should apply per row.
- Does Better Sheets have a formula tool?
- The Formula generator on Better Sheets is built for Sheets syntax and pairs well with prompts you refine by hand.
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Read guide →Done reading about AI prompts for formulas?
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