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Excel Formulas

Write, understand, and debug Excel formulas — from IFERROR to XLOOKUP.

Excel Formulas · July 1, 2026 · 4 min read IFERROR + XLOOKUP: Building Error-Proof Excel Formulas When to use IFERROR, IFNA, and XLOOKUP's if_not_found argument — and when hiding errors is exactly the wrong move. Practical patterns for formulas that fail loudly only when they should. Excel Formulas · June 25, 2026 · 5 min read AI Excel Formula Generator: Write Formulas in Plain English Turn plain English into a working Excel formula using your real sheet structure. See prompt examples, common failure cases, and a 30-second verification checklist.