AI Tools for Excel: What Each One Does Well

You have a spreadsheet, a deadline, and a formula you can't remember. AI tools for Excel now cover that, and a lot more: cleaning a messy export, summarising a sheet, drawing a chart, even building a model from a description.

No single tool does every job best, so the useful question is which tool for which job. This post sorts them into four jobs and says plainly where each one falls short. All product details were checked against each vendor's own pages as of October 2026.

Quick comparison

Two things sit under every row of that table. Availability depends on your account and your organisation's settings, which each vendor says on its own pages. And every one of these tools can be wrong, which is why the last section is about checking.

Write a formula

This is the job where AI earns its keep fastest. You describe the calculation in plain words and get back something you can paste in.

Microsoft's Copilot in Excel is the native option if you live in Excel. Microsoft's help page says it can generate data and formulas, perform calculations across multiple sheets, and summarise data. It has an edit mode that changes the workbook directly, a plan mode that lays out steps for you to confirm first, and a chat-only mode that makes no changes.

Gemini in Google Sheets is the equivalent if your team works in Sheets. Google's help page describes asking for a formula in the side panel, plus a "Fix" option when a formula cell shows an error. It adds a caveat worth knowing: the feature works best with native Google Sheets files, so an .xlsx file needs "Save as Google Sheets" first.

GPTExcel is a separate web tool rather than something built into your spreadsheet. Its own site says you upload an Excel or CSV file, ask in plain English, and get formulas, pivot tables, charts and summaries, with formulas for Excel and Google Sheets. It's the easiest way to try this job without touching your Microsoft or Google account setup.

The pattern that works with all of them: give the column names and one example row, not just the goal. "Sum sales where region is West and the month is March, columns B, C and D" beats "total the West numbers."

Clean messy data

Dates in three formats, names with stray spaces, the same company spelled four ways. This is the dull work AI handles well, because the right answer is usually obvious and quick to spot-check.

Copilot in Excel and Gemini both list sorting, filtering and formatting edits among their actions. For bulk work, a dedicated add-in is a different shape of tool. GPT for Work is offered as an add-in for Excel and an add-on for Google Sheets, and its homepage lists cleaning messy data, applying one prompt to every row, and writing, checking and fixing formulas. The "one prompt, every row" idea is the one worth understanding. Instead of asking about the sheet, you run the same instruction down a column: categorise each feedback comment, pull a city out of each address, tag each product from its description.

The same page is candid about limits. It says the tool is not the best for super complex financial modelling. That honesty is useful: a tool built for repetitive row work is a different purchase from one built to assemble a model.

When you clean data with any of these, work on a copy. Keep the original sheet untouched, run the cleanup on a duplicate tab, and compare row counts before and after.

Analyse data and make charts

Here you stop asking for a cell and start asking a question: which region slipped, what changed month over month, where are the outliers.

Microsoft says Copilot shows insights as charts, PivotTables, summaries, trends or outliers, and that charts and PivotTables keep editable links to the source data. Google's page says Gemini in Sheets can identify trends, build charts, and show an "Analysis steps" view so you can see how it got its answer. Inserted charts land on a new tab alongside their underlying data.

Claude takes a different route. Anthropic's help article on creating and editing files says Claude runs code to analyse uploaded CSV, TSV and other data files and can produce visualisations as image files. That means you get a chart and also a script behind it. OpenAI documents a similar idea for developers: its Code Interpreter tool lets a model write and run Python in a sandbox for data analysis and handles .xlsx among other file types. ChatGPT is the assistant most people mean by "chatgpt for excel"; what the ChatGPT app itself offers is a question for OpenAI's help pages, so this post makes no claim about it.

The tradeoff is real. In-sheet tools keep everything in one place and respect your existing structure. Chat-based tools are more flexible, but the result lives outside your workbook until you bring it back. For a deeper look at the risks specific to charts, see our post on AI data visualization.

Build a whole workbook

This is the newest job and the one to be most careful with. You describe a budget, a tracker or a model and the tool builds it.

Microsoft's page says Copilot in Excel can make dashboards, planning tools and templates from scratch, and that its edit mode handles multi-step tasks such as reshaping data, merging sheets and building reports. Anthropic's help article says Claude can create financial models in Excel with working formulas and hand you the .xlsx file to download. Anthropic also documents a Claude add-on for Google Docs, Sheets and Slides, which it describes as a beta. It says Claude can build spreadsheet models, write and fix formulas, and clean up data in Sheets, with changes visible in version history. Whether you can install it depends on your Google Workspace admin's Marketplace settings.

Two honest warnings:

• A built workbook is a first draft. Anthropic's own article says you may need to review and refine the output to meet your requirements.
• The more the tool builds, the more you have to audit. A formula you asked for is one thing to check. A forty-formula model you didn't write is forty.

If the workbook will drive a decision, ask the tool to walk through how the key totals are calculated, then check two or three by hand.

AI tools get numbers wrong: how to check

Microsoft is direct about this. Its Copilot in Excel FAQ says the feature can sometimes make mistakes, misinterpret information, or produce inaccurate results, and tells you to review, edit and verify anything Copilot creates before you rely on it. Google's page says Gemini features may suggest inaccurate information. This isn't a quirk of one product. It's how language models behave, and our guide to AI hallucinations explains why a confident answer can still be wrong.

A spreadsheet makes this sneakier, because a wrong formula still returns a number. Five checks cover most of it:

1. Test with a case you know. Put in a row where you already know the answer and see if the formula agrees.
2. Check the ranges. A formula that stops at row 99 on a 120-row sheet looks fine and is wrong.
3. Look for hardcoded numbers. Ask the tool, or click the cell. A pasted value in the middle of a formula chain is a classic.
4. Compare totals. Does the sum match a figure from outside the sheet?
5. Keep the original. Never let the first AI pass overwrite your only copy.

Microsoft's own page adds a specific caution to avoid using Copilot for decisions in sensitive areas such as finance. Take that seriously for anything audited, regulated or shared with a board.

Which one to pick

• You work in Excel all day: start with Copilot in Excel, then check whether your Microsoft 365 licence and organisation's settings include it. Microsoft says it may not be, depending on both.
• You work in Google Sheets: Gemini in Sheets is the native route. Google says it needs an eligible Workspace or Google AI plan.
• You have a one-off file and no add-in access: a chat assistant with file upload, such as Claude, or a web tool like GPTExcel.
• You have thousands of rows of repetitive work: a bulk-processing add-in like GPT for Work is built for exactly that.
• The workbook is for a decision: any of the above, plus manual verification.

Keeping a spreadsheet routine you can reuse

Most spreadsheet AI help is one-off. You solve this month's report, close the chat, and next month you re-explain the whole thing. The steps that worked live in your head and in a chat history you won't find again.

That's the gap Taku works on. It mirrors an AI app or workflow someone already got working into your own desktop workspace, where you run it, remix it and keep it, so a routine becomes something you reuse rather than re-prompt. The free app library shows the shape of it. Taku is in Beta, and the Mac app is available now.

Key points

• Sort the tools by job: formulas, cleaning, analysis and charts, whole workbooks.
• Native tools (Copilot in Excel, Gemini in Sheets) keep work inside your file. Chat tools and add-ins trade that for flexibility or bulk speed.
• Availability depends on your account and organisation settings. Check the vendor's page before you plan around a tool.
• Vendors themselves say these tools can be wrong. A wrong formula still returns a number.
• Test with a known case, check ranges, look for hardcoded values, compare totals, and keep the original.

FAQ

What is the best AI for Excel?

It depends on the job. For working inside Excel, Copilot in Excel is Microsoft's own option. For Google Sheets, Gemini. For a one-off file, a chat assistant or a web tool. Match the tool to the job before comparing features.

Is there an AI Excel formula generator I can use without installing anything?

Yes. A web tool like GPTExcel takes an uploaded file or a plain-English description and returns a formula. A chat assistant with file upload can do the same. Neither needs an add-in, though you should still check what happens to your file.

Can ChatGPT work with Excel files?

OpenAI's developer documentation describes a Code Interpreter tool that runs Python in a sandbox and handles .xlsx files for data analysis. How that appears inside the ChatGPT app is a question for OpenAI's own help pages.

Can I trust a formula an AI gives me?

Treat it as a draft. Microsoft says to review and verify anything Copilot creates before relying on it. Test the formula on a row where you know the answer and confirm the ranges cover all your data.

Does Copilot in Excel work on a Mac?

Microsoft's help page lists Excel on Mac with edit, chat and plan modes, and says Copilot availability depends on your licence and your organisation's settings.

Should I use an add-in or a built-in AI feature?

Built-in features keep everything in one file and one account. Add-ins like GPT for Work are worth a look when the job is repetitive row-by-row work at volume, or when you want a choice of AI models.