Excel library

Fix Excel Formula Errors

When a formula stops working, the cause is usually one of a few things: calculation set to Manual, a cell formatted as Text before the formula was typed, references that shifted when rows were sorted or copied, or a function the current version of Excel does not support.

Check those first. Press F9 to recalculate, look at Formulas > Calculation Options, and use Formulas > Evaluate Formula to step through the calculation and see where the result goes wrong.

The fixes below are grouped by symptom: formulas that do not update, show as text, return 0, break after saving, dragging or sorting, or show errors such as #NAME?.

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