How to convert radians to degrees

Paul Hudson    February 13th 2018    @twostraws

Most angles in iOS are measured using radians rather than degrees, but the majority of users prefer to see degrees so you’ll need to do some conversion. The equation to convert between the two is simple enough: multiply the number by 180, then divide the result by Pi.

To make things easier, drop in this function:

func rad2deg(_ number: Double) -> Double {
    return number * 180 / .pi
}

You can now use rad2deg(5) to find 5 radians in degrees.

Available from iOS 8.0

Did this solution work for you? Please pass it on!

Tweet

Other people are reading…

• What are the changes in Swift 2.2?
• How to pass the Fizz Buzz test
• How to use local variable observers
• What’s the difference between a function and a method?
• How to convert a String to Data

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.