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Excel Formula Explainer

Paste an Excel or Google Sheets formula, get a plain-English breakdown of every function. Covers 60+ functions, gotchas, modern alternatives.

Updated May 2026

What this formula does (1 function call)

VLOOKUP

4 args

Look up a value in the first column of a range and return a value from a column to the right.

Arguments: lookup_value, table_array, col_index_num, [range_lookup]

Returns: The matched cell's value, or #N/A if not found.

Gotcha: VLOOKUP only looks RIGHT — the lookup column must be the leftmost. The 4th arg defaults to TRUE (approximate match) which is almost never what you want — pass FALSE / 0 for exact match.

Prefer: XLOOKUP (better in every way: any direction, exact match by default, supports default value, faster).

Your arguments
A2, Products!A:D, 4, FALSE
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What it does

An Excel formula explainer turns =VLOOKUP(A2, Products!A:D, 4, FALSE) into plain English: "Look up A2 in the first column of Products!A:D, return the 4th column, exact match only." Useful when you've inherited someone else's spreadsheet and the formulas read like a foreign language.

This isn't an AI tool — every output is deterministic. We tokenize the formula, identify recognized functions (currently 60+ across lookup, math/stats, text, logic, date/time, info, and modern dynamic-array functions), and show the per-function summary, arguments, return value, common gotchas, and a "prefer" hint when there's a better modern alternative (e.g. XLOOKUP over VLOOKUP). Works for Excel 365 / 2021+ formulas and Google Sheets formulas alike — they share most of the function vocabulary.

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Example input & output

Input

=IF(B2>=70, "Pass", IF(B2>=50, "Borderline", "Fail"))

Output

Two IF function calls (nested):
1. IF(B2>=70, "Pass", <else>) — if B2 ≥ 70, return "Pass"; else evaluate the inner IF.
2. IF(B2>=50, "Borderline", "Fail") — if B2 ≥ 50, return "Borderline"; else "Fail".

Gotcha: nested IFs become unreadable past 2 levels. Refactor to IFS or LET.

The explainer shows each IF call separately and flags the readability issue — useful when you're modernizing legacy formulas to IFS / SWITCH.

How to use it

  1. Paste an Excel or Google Sheets formula into the input (e.g. =SUMIFS(B:B, A:A, "EU", C:C, 2026)).
  2. Read the per-function breakdown — what each function does, its arguments, and what it returns.
  3. Heed the gotchas (yellow boxes) — these are the bugs the function gets blamed for daily.
  4. Click a sample formula button if you don't have one to paste; samples cover VLOOKUP, XLOOKUP, IFS, FILTER, LET — the formulas that show up most.

How it works

The tool does three things in sequence:

  1. Tokenize: regex-find every NAME( pattern, then depth-aware paren scan to capture the matching ). Strings are quote-escaped so commas inside string literals don't confuse argument counting.
  2. Lookup: each function name (uppercased) is keyed into a static spec table with summary / args / returns / gotcha / prefer. Unknown functions get flagged separately.
  3. Operator scan: comparison operators (=, <>, <=, >=), the & concatenation operator, and dollar-sign anchors get their own contextual notes.

Everything runs in your browser. Nothing's uploaded; no AI; same input → same output every time.

When to use this tool

  • Inheriting a workbook with formulas you didn't write — fastest way to grok what each one does.
  • Teaching a teammate Excel — paste a real formula, walk them through the breakdown.
  • Debugging a formula that errors — the gotcha notes catch the most common causes (#N/A from VLOOKUP missing FALSE, #VALUE! from FIND case-sensitivity, etc.).
  • Migrating from VLOOKUP to XLOOKUP — the explainer flags VLOOKUP and recommends XLOOKUP with notes on why.

When not to use it

  • Specialty functions (Power Query M, VBA, Excel Web Services) — out of scope. The tool flags unrecognized functions and points to Microsoft's full reference.
  • CSE array formulas (the {=...} kind) — modern dynamic arrays in Excel 365 / Sheets usually replace them, but if you really need legacy CSE handling, this tool just flags it without deep analysis.
  • Generating formulas from a problem description — for that, an LLM is the right tool (this is the inverse — formula → English, not English → formula).

Frequently asked questions

Does this work with Google Sheets formulas?
Yes — Excel and Google Sheets share most of the function vocabulary. A handful of Sheets-only functions (QUERY, IMPORTRANGE, GOOGLEFINANCE, ARRAYFORMULA) aren't covered yet; the tool flags them as unrecognized.
What about LibreOffice / Numbers?
LibreOffice Calc shares most function names with Excel; works fine. Apple Numbers has its own dialect — most functions overlap but a few names differ.
How many functions are covered?
60+ across lookup (VLOOKUP, XLOOKUP, INDEX, MATCH), math/stats (SUM, AVERAGE, MEDIAN, COUNT family, ROUND family, MIN, MAX, ABS, POWER, SQRT, MOD), text (LEFT, RIGHT, MID, LEN, TRIM, UPPER, LOWER, PROPER, FIND, SEARCH, SUBSTITUTE, REPLACE, TEXT, TEXTJOIN, CONCATENATE), logic (IF, IFS, AND, OR, NOT, IFERROR, IFNA), date/time (NOW, TODAY, DATE, YEAR, MONTH, DAY, WEEKDAY, DATEDIF, EOMONTH), info (ISNUMBER, ISTEXT, ISBLANK, ISERROR, ISNA), modern dynamic arrays (FILTER, SORT, UNIQUE, SEQUENCE, LET, LAMBDA), randomness (RAND, RANDBETWEEN). Patches welcome via /suggest.
Why does it recommend XLOOKUP over VLOOKUP?
VLOOKUP only looks RIGHT (the lookup column must be leftmost), defaults to approximate match (the wrong default for almost every real use case), and returns #N/A when not found (you have to wrap in IFERROR). XLOOKUP solves all three: any direction, exact-match default, optional default value built in. Newer Excel (2021+) and Sheets both support it.
Can it explain custom LAMBDA functions?
Partially — it'll flag a LAMBDA call but it doesn't follow into the function body. For named LAMBDAs (defined via Name Manager) it'll be marked as unrecognized; the spec table only knows the standard library.

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