Plane angles have been measured in many different units. The most contemporary units are the degree ( ° ) and radian (rad), but many others have been used throughout history.
The radian (rad) is the SI unit for measuring angles. one radian is just under 57.3 degrees. Accepted prefixes still not accepted in pure math.
Grad unit or gradian unit is a unit of a plane angle, defined as one-hundredth of the right angle there are 100 gradians in 90 degrees. The gradian other names the gon, grad, or grade.
Divide the grad value by 63.661978
radian = grad / 63.661978
Multiply the radian value by 63.661978
grad = radian x 63.661978
One radian (rad) is equal to 63.661978 grad
1 radian (rad) = 63.661978 grad
One grad is equal to 0.015708 radian (rad)
1 grad = 0.015708 radian (rad)