Unit Descriptions

1 Gradian:1 gradian is exactly 1/400 of a revolution or 2π/400 or 0.9°. In terms of the SI unit radians 1 grad is approximately 15.707 963 x 10^-3 rad.

1 Revolution (or cycle, full circle, turn, rotation) is equal to exactly 360° (degrees of arc) or 2π radians (SI unit) or 400 gradians or 4 right angles.