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The short answer
Claude for Excel is an add-in that puts Claude inside Excel. It reads your open workbook, answers questions with cell-level citations, debugs errors, and builds or populates models — without you leaving the spreadsheet.
It's available on Pro, Max, Team and Enterprise plans. Install from Microsoft AppSource,
then open it with Ctrl+Alt+C on Windows or Ctrl+Option+C on Mac.
Setting it up
- Install Claude for Excel from Microsoft AppSource.
- Open Excel and activate the add-in.
- Sign in with your Claude account (Pro or above).
- Open the panel with
Ctrl+Alt+C(Windows) orCtrl+Option+C(Mac).
Good first command on any spreadsheet you didn't build: "Walk me through this workbook."
What it's genuinely good at
Understanding an inherited spreadsheet
The strongest use case. Ask how the tabs connect and it reads everything first, then maps the data flow — which cells feed which sheets, where the assumptions live, how totals roll up. Anyone who has inherited a model from someone who left knows how much time that saves.
Tracing errors to their root
It catches broken references and traces where they cascade, so you see every affected cell at once rather than hunting tab by tab. It then offers fixes rather than applying them blindly.
Changing assumptions without breaking formulas
This is the part that distinguishes it from pasting data into a chat window. It adjusts inputs while preserving the formula relationships around them, rather than overwriting cells with static values.
Building and populating models
Generate a new model from a description, or fill an existing template — "populate this template with a $500M purchase price and 6× leverage" is the shape of instruction it handles.
Cell-level citations matter here
When Claude answers a question about your workbook it points at the specific cells the answer came from.
In a spreadsheet context that's not a nicety — it's the difference between an assertion you have to verify manually and one you can check in a click. For anything with financial consequences, do check.
The security caveat
Only use it with spreadsheets you trust. Files from external sources can contain hidden instructions designed to manipulate the add-in into extracting data, modifying records, or doing something destructive.
This is a real risk class, not a theoretical one. Treat an unsolicited workbook the way you'd treat an unsolicited email attachment.
If you're not on a paid plan
The add-in needs Pro or above. On the free tier you can still upload a spreadsheet to Claude directly and ask questions about it — you lose the live in-Excel integration and the cell-level citations, but for one-off analysis it works.
ChatGPT is also strong at spreadsheet analysis, writing and running code against uploaded data and returning charts. Different approach, comparable usefulness.
Common questions
Is Claude for Excel free?
Does it work on Mac?
Can it edit my spreadsheet directly?
Does it work with multi-tab workbooks?
Is it safe to use on any spreadsheet?
Excel support comes with Pro
The add-in is included with any paid Claude plan — no separate purchase.