NEW: Join my free 100 Days of SwiftUI challenge today! >>

How to convert degrees to radians

Swift version: 5.1

Paul Hudson    @twostraws   

Most users think about angles in terms of degrees from 0 to 360, but internally most of iOS works in radians so you’ll need to do some conversion. The equation to convert between the two is simple enough: multiply the number by Pi, then divide the result by 180.

To make things easier, drop in this function:

func deg2rad(_ number: Double) -> Double {
    return number * .pi / 180
}

You can now use deg2rad(90) to find 90 degrees in radians.

LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!

Available from iOS 8.0

Similar solutions…

About the Swift Knowledge Base

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

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 2.0/5