# ATAN

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## Content



This function calculates the arctangent, that is, the angle whose tangent is the specified value.

## Syntax

ATAN(*value*)

## Arguments

For the argument, specify the tangent of the angle you want to return, which must be a value between –1 and 1.

## Remarks

The result angle is in radians between –PI/2 and PI/2. If you want to convert the result to degrees, multiply the result by 180/PI.

## Data Types

Accepts numeric data. Returns numeric data.

## Examples

`ATAN(B3)`
`ATAN(R3C2)`
`ATAN(1)` gives the result 0.7853981634

## Version Available

This function is available in product version 1.0 or later.

## See Also

[ACOS](/spreadnet/docs/latest/online-formula/formulas-functionsall/formulas-functsAtoC/FunctionACOS) \| [ASIN](/spreadnet/docs/latest/online-formula/formulas-functionsall/formulas-functsAtoC/FunctionASIN) \| [TAN](/spreadnet/docs/latest/online-formula/formulas-functionsall/formulas-functsTtoZ/FunctionTAN) \| [Math and Trigonometry Functions](/spreadnet/docs/latest/online-formula/formulas-overview/formulas-functs/formulas-functtypes/formulas-functsmathtrig)