Gradian to Radian
Convert gon to rad instantly — free, no sign-up.
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About the Gradian (gon)
The Gradian is divides a full circle into 400 parts instead of 360, making a right angle exactly 100 gradians — used in some surveying and civil engineering software.
About the Radian (rad)
The Radian is the SI unit of angle, defined so a full circle equals 2π radians — the natural unit for calculus and most programming math functions (Math.sin, Math.cos, etc.).
How to convert gon to rad
- Enter the value in gon in the box above.
- The rad equivalent updates instantly.
- Use the swap button to convert rad back to gon just as easily.