The grad, gradian, is a unit of plane angle that is equivalent to 1⁄400 of a circle. It is also known as gon or grade (not to be confused with gradient or radian unit). One grad equals 9⁄10 of a degree or π⁄200 of a radian. In continental Europe, the term centigrade was used for one hundredth of a grad. This was one of the reasons for the adoption of the term Celsius to replace centigrade as the unit of temperature.Read moreList of all Grad to other angle units individual converters.