Math & Trig
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=ATAN()
Returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is number. The returned angle is given in radians in the range -pi/2 to pi/2.
Applies To:
Excel for Microsoft 365Excel for Microsoft 365 for MacExcel 2024Excel 2024 for MacExcel 2021Excel 2021 for MacExcel 2019Excel 2016
=ATAN(number)
Hover argument names in the table for details.
Output typeNumber
Popularity28 / 100
VolatileNo
Dynamic ArrayNo
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◧ Arguments
| Argument | Type | Required | Description |
|---|---|---|---|
number |
Number | Required | The tangent of the angle you want. |
▣ Examples
Arctangent of 1 in radians, pi/4
=ATAN(1)
Result:
0.785398163
Arctangent of 1 in degrees
=ATAN(1)*180/PI()
Result:
45
Arctangent of 1 in degrees
=DEGREES(ATAN(1))
Result:
45
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