Engineering

IMCONJUGATE Function in Excel

Returns the complex conjugate of a complex number.

Syntax

  • =IMCONJUGATE(inumber)

Arguments

  • inumber (required): Complex number

Examples

  • =IMCONJUGATE("3+4i") - Conjugate of 3+4i - Result: 3-4i

IMCONJUGATE in technical sheets

  • Document units in adjacent cells — many engineering functions require exact unit strings.
  • Use [CONVERT](/functions/convert/) for unit changes before specialized formulas.
  • Validate inputs with [ISNUMBER](/functions/isnumber/) and range checks.

Common errors

  • #NUM! if not valid complex number

Use cases

  • Complex analysis
  • Signal processing
  • Engineering

Frequently asked questions

  • What is the IMCONJUGATE function in Excel? IMCONJUGATE returns the complex conjugate of a complex number. The syntax is =IMCONJUGATE(inumber). Typical use cases include complex analysis, signal processing, engineering.
  • How do I use the IMCONJUGATE function? To use IMCONJUGATE, type =IMCONJUGATE( in a cell and provide the required arguments. Excel will show you the syntax and parameter hints as you type. Make sure to close the parentheses and press Enter to execute the function.
  • Why is IMCONJUGATE not working in my Excel? Common issues with IMCONJUGATE include #NUM! if not valid complex number. Start by checking the syntax =IMCONJUGATE(inumber), then verify each referenced cell or range.

Editorial review

  • Reviewed by Excel.Directory Editorial Team. Updated May 2026.