= Write My Formula

Excel formula explainer

Explain an Excel formula before you trust it.

Paste a formula and get a readable breakdown of the functions, logic, assumptions, and compatibility checks.

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Formula request

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Mode
Spreadsheet
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Purpose-built inputs

A focused workflow for everyday spreadsheet work.

Structured formula builder

Task, table context, target range, and function hint keep the request specific.

Write / Explain / Fix modes

Generate a new formula, translate a pasted one, or diagnose common syntax issues.

Excel and Sheets toggle

Compatibility notes call out modern functions and platform-specific behavior.

Formula-bar output

The result is formatted for scanning and placed next to a copy button.

Common formulas

Pick the formula you came for.

Percentage formulas

Build percent of total, percent change, discount, markup, tax, tip, and completion-rate formulas.

Date formulas

Create due dates, workday counts, month-end dates, date differences, and overdue checks.

FILTER formulas

Return matching rows for status, region, date, text, and threshold conditions.

Text formulas

Split, extract, join, trim, clean, and replace text from messy imported cells.

Data validation formulas

Block bad IDs, duplicate values, missing fields, and invalid entries with custom TRUE/FALSE rules.

XLOOKUP formulas

Return matching values with separate lookup and return ranges.

INDEX MATCH formulas

Build flexible lookup formulas for left lookups, two-way lookups, and older Excel files.

SUMIFS formulas

Total rows that match status, date, category, customer, or region rules.

Use case

Excel formula explainer for spreadsheet work.

Understand an Excel formula before editing, copying, or relying on it.

What this page gives you

  • A plain-English breakdown of the pasted formula.
  • A step-by-step read of the branching logic or function chain.
  • Notes about assumptions, blanks, and compatibility before you edit it.

When to use it

Use this page when a workbook already contains a formula and you need to understand it before changing references, copying it to another sheet, or explaining it to someone else.

Do not rely on an explanation alone for financial or operational decisions. Pair it with a few rows where you already know the expected answer.

Worked example

A nested IF can label blank customer rows separately from rows that need review.

=IF(A2="","Missing",IF(B2>1000,"Review","OK"))

The formula first checks whether A2 is blank, then checks whether revenue in B2 is above 1000, and returns one of three text labels.

Check before you paste

  • Look for assumptions about blank cells and error handling.
  • Check whether the formula uses relative references that shift when copied.
  • Confirm the explanation against a few known rows in the sheet.

Upgrade when the work piles up

Keep going when the sheet gets complicated.

Try twice as a guest. Free accounts get 3 runs per week plus a monthly product email. Upgrade when formula work becomes a recurring part of the week.

Founding access

$9

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