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Free Angle Converter – Degrees, Radians & More

Convert between degrees, radians, gradians, arcminutes and turns.

Angle Converter What is this? ↓
About the Angle Converter

What is the Angle Converter?

An angle converter switches an angle between degrees, radians, gradians, arcminutes, arcseconds and full turns.

Why use this calculator?

Mathematics and physics use radians, navigation and surveying use degrees and mils, and trigonometry homework mixes both.

How to use it

  1. Enter the angle value.
  2. Choose the source and target units.
  3. Read the converted angle.

Formula

180° = π radians = 200 gradians = 1/2 turn.
There are 60 arcminutes in a degree and 60 arcseconds in an arcminute.
Frequently Asked Questions
How many radians are in 180 degrees?
Exactly π radians, about 3.14159.
What is a gradian?
A gradian is 1/400 of a full circle, so a right angle is 100 gradians. Surveyors sometimes use it.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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