MSDN Library

Returns radians when a numeric expression, in degrees, is entered.

 Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

## Syntax

```RADIANS ( numeric_expression )
```

## Arguments

numeric_expression

Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type.

## Return Types

Returns the same type as numeric_expression.

## Examples

### A. Using RADIANS to show 0.0

The following example returns a result of 0.0 because the numeric expression to convert to radians is too small for the RADIANS function.

```SELECT RADIANS(1e-307)
GO
```

Here is the result set.

```-------------------
0.0
(1 row(s) affected)
```

### B. Using RADIANS to return the equivalent angle of a float expression.

The following example takes a float expression and returns the RADIANS of the specified angle.

```-- First value is -45.01.
DECLARE @angle float
SET @angle = -45.01
SELECT 'The RADIANS of the angle is: ' +
GO
-- Next value is -181.01.
DECLARE @angle float
SET @angle = -181.01
SELECT 'The RADIANS of the angle is: ' +
GO
-- Next value is 0.00.
DECLARE @angle float
SET @angle = 0.00
SELECT 'The RADIANS of the angle is: ' +
GO
-- Next value is 0.1472738.
DECLARE @angle float
SET @angle = 0.1472738
SELECT 'The RADIANS of the angle is: ' +
GO
-- Last value is 197.1099392.
DECLARE @angle float
SET @angle = 197.1099392
SELECT 'The RADIANS of the angle is: ' +
GO
```

Here is the result set.

```---------------------------------------
The RADIANS of the angle is: -0.785573
(1 row(s) affected)
---------------------------------------
The RADIANS of the angle is: -3.15922
(1 row(s) affected)
---------------------------------------
The RADIANS of the angle is: 0
(1 row(s) affected)
---------------------------------------
The RADIANS of the angle is: 0.00257041
(1 row(s) affected)
---------------------------------------
The RADIANS of the angle is: 3.44022
(1 row(s) affected)
```