#NUM!Supported on: Microsoft Excel® & Google Sheets™

How to Fix the #NUM! Error in Excel & Google Sheets

The #NUM! error occurs when a formula contains numeric values that fall outside the supported mathematical domain or when an iterative calculation fails to converge on a solution.

Common Root Causes of #NUM!

  • 1Supplying a negative number to a function requiring a positive input (e.g., =SQRT(-25)).
  • 2Result of a calculation is too large or too small to be represented in IEEE floating point (exceeding 10^308).
  • 3Iterative financial functions like IRR() or RATE() failing to find a rate after default iteration iterations.

Formula Syntax Comparison

Broken Formula
=SQRT(A2 - B2) (where A2 < B2)
Corrected Formula
=SQRT(MAX(0, A2 - B2))

Manual Step-by-Step Fix

1

Step 1

Ensure input parameters comply with function mathematical domains (e.g., use ABS() with SQRT()).

2

Step 2

Provide a realistic initial guess argument in IRR(values, [guess]).

3

Step 3

Review exponents and power operations to prevent numerical overflow.

Automate this Fix with SheetFactorys

Zero manual debugging required

SheetFactorys evaluates numerical limits, validates mathematical convergence, and automatically injects boundary conditions into complex financial formulas.

Available in Microsoft AppSource & Google Workspace
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