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ATAN function in Excel

Returns the arctangent of a number

=ATAN(number)

ATAN syntax and parameters

One argument, one required.

  • numbernumberRequired

    The tangent of the angle you want.

ATAN examples

Formulas you'll actually reuse.

  1. The arctangent of 1, in radians:

    =ATAN(1)

    Result0.7854

  2. The same angle in degrees — wrap in DEGREES:

    =DEGREES(ATAN(1))

    Result45

ATAN in Google Sheets

Same name — your formula ports as-is.

Try ATAN in the playground

Edit the example — nothing to install.

Preloaded with the ATAN formula from Example 1 — change anything and watch it respond.

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Related functions

More ways Excel gets this done.