Translate this Excel / Google Sheets formula into plain English. Tell me what it does, why it might be there, and how to read it next time.
FORMULA: {paste}
SPREADSHEET CONTEXT: {what's_in_the_workbook + which_sheets_are_referenced}
WHAT YOU THINK IT DOES (your hunch): {your_guess_or_'no_idea'}
WHY YOU NEED TO UNDERSTAND IT: {modify / debug / replicate / take_over_a_workbook}
YOUR EXCEL LEVEL: {beginner / intermediate / advanced}
FOR THE FORMULA, GIVE ME:
1. **Plain-English description** — 1-2 sentences. Avoid jargon.
2. **Breakdown by part** — quote each chunk of the formula and explain what it does in order.
3. **What it returns** — type (number, text, error, array) + example output.
4. **Common failure modes** — what makes this formula break or return wrong results.
5. **A simpler equivalent** — if it can be written more cleanly (newer functions like LET, LAMBDA, XLOOKUP), show the cleaner version.
6. **One thing to know for next time** you see a formula like this.0 copies·0 saves·5 views
157 words·984 chars
Sample output
Formula: =IFERROR(INDEX(Customers!$B$2:$B$2000, MATCH(1, (Customers!$A$2:$A$2000=A2)*(Customers!$C$2:$C$2000>=DATE(2024,1,1)), 0)), "")
Context: workbook tracking 2024 sales; column A on this sheet has customer IDs; the Customers sheet has 2000 rows of records.
Hunch: something about looking up the customer name only if their join date is in 2024.
Need: modifying it.
1. Plain-English description: Look through the Customers sheet for the first record where the customer ID matches A2 on this sheet AND the customer's join date is on or after Jan 1, 2024. Return their name (column B). If nothing matches, return an empty cell.
2. Breakdown by part:
=IFERROR(...) — wraps the whole formula and returns "" (empty) if any part fails.INDEX(Customers!$B$2:$B$2000, ...) — returns the value from column B of the Customers sheet at the row position calculated by MATCH.MATCH(1, ..., 0) — finds the first row position where the inner array equals 1 (exact match).(Customers!$A$2:$A$2000=A2) — creates an array of TRUE/FALSE: which rows in the Customers sheet have a customer ID matching this row's A2.* — multiplies the two TRUE/FALSE arrays. TRUE × TRUE = 1; everything else = 0. This is the classic 'array AND' trick — both conditions must be true.(Customers!$C$2:$C$2000>=DATE(2024,1,1)) — second TRUE/FALSE array: which rows have a join date in 2024 or later.DATE(2024,1,1) — Jan 1, 2024 as a real date.3. Returns: customer name (text) or "".
4. Common failure modes:
""."".5. Simpler equivalent (Excel 365 or Sheets):
=IFERROR(XLOOKUP(1, (Customers!A2:A2000=A2)*(Customers!C2:C2000>=DATE(2024,1,1)), Customers!B2:B2000), "")
Or with FILTER:
=IFERROR(INDEX(FILTER(Customers!B2:B2000, (Customers!A2:A2000=A2)*(Customers!C2:C2000>=DATE(2024,1,1))), 1), "")
6. Next time you see a formula like this:
The * operator inside MATCH(1, ..., 0) is the signature of the 'array AND' pattern — two TRUE/FALSE arrays multiplied together. Whenever you see (...=X)*(...>=Y) inside MATCH or SUMPRODUCT, that's the formula asking 'both conditions true on the same row.' This pattern is everywhere in legacy spreadsheets and predates the modern XLOOKUP/FILTER functions.
Parameters
Text generation parameters
FAQ
Spreadsheet bugs are 70% range bugs ($B$2:$B$2000 misses your row 2001) and 25% data-type bugs (text dates vs real dates). Always test with one row above and one below your supposed range. The prompt targets ChatGPT (GPT-4) and lives in the Coding & Development category on mycopyprompt.
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