MATLAB deg2rad Function

This tutorial will discuss converting angles from degrees to radians using MATLAB’s deg2rad() function.

the MATLAB deg2rad() Function

We can use MATLAB’s deg2rad() function to convert the angle units from degrees to radians. The syntax of the deg2rad() function is given below.

rad = deg2rad(deg)

The above syntax will convert the angle stored in the variable deg to radians and save it in the rad variable. The input variable deg can be a scalar, vector, matrix, or array of any dimension.

The output variable will have the same data type and size as the input variable. For example, if the input angle is a scalar, the output angle will also be a scalar.

Suppose the input variable is a matrix, array, or vector; the deg2rad() function will convert all the matrix, array, or vector elements to radians. For example, let’s convert an angle in degrees to radians using the deg2rad() function.

See the code below.


rad = deg2rad(90)


rad =


In the above code, we converted the 90-degree angle to radians. The deg2rad() function is introduced in Matlab version R2015b, and there is another function, degtorad(), which is introduced in Matlab version R2009b, and it was used to convert the angle from degree to radians.

MATLAB does not recommend the degtorad() function if we use MATLAB version R2015b or higher, but we can use it if the version of Matlab is below R2015b. The degtorad() also depends on the map toolbox, and we cannot use the function if we don’t have the map toolbox.

Another difference is that the degtorad() function accepts inputs in integer data types, and the deg2rad() function accepts inputs in single and double data types. We can convert an integer data type to single or double using Matlab’s single() and double() functions.

If the input is in an integer data type like uint8, we have to convert the input to a single or double data type before using the deg2rad() function to convert the angle from degree to radians. If we used the degtorad() function in the above example, the output of the above example would remain the same.

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