Fix your Excel formula errors — free.

What these errors mean

Excel shows an error token in a cell when a formula can’t return a valid answer. The most common ones:

• #REF! — the formula points at a cell, row, column, or sheet that was deleted or moved.
• #DIV/0! — it divides by zero, or by a cell that’s empty.
• #VALUE! — a value is the wrong type: text where a number is expected.
• #NAME? — an unrecognized name — a misspelled function or a named range that doesn’t exist.
• #SPILL! — a dynamic-array formula can’t expand because something is already in the cells it needs.
• #N/A — a lookup (VLOOKUP, XLOOKUP, MATCH) found no match.
• #NUM!, #NULL!, #CALC! — invalid numbers, non-intersecting ranges, or a calculation that can’t complete.

The silent-wrong ones

Not every bad formula shows an error token. Some calculate a number that’s simply wrong. We recalculate each formula with our own engine and flag any cell where the result differs from the value stored in the file — those are the ones worth a closer look even though Excel shows no error.

How it works

The page runs the same functions your AI agent would call through our tools: it locates every formula, recalculates each result with our own engine, compares it with the value stored in the file, and explains what it found. It reads your file in memory and never stores it — this check changes nothing, it only tells you what’s wrong.

Want this inside your AI agent, on your own machine, with no upload at all? Install xlsx-for-ai and ask Claude or Cursor to “find the broken formulas in this workbook.”