Calculate the length of a spiral or the length of material contained in a roll.
The length of a spiral can be calculated as
L = 3.14 n (D + d) / 2 (1)
L = length of spiral (m, ft ...)
n = number of rings
D = spiral outside diameter (m, ft ...)
d = spiral inside diameter or opening (m, ft ...)
The equation can be used to calculate the length of a material of uniform thickness like a belt in a roll.
Spiral Length Calculator
n - number of rings
D - outside diameter (m, ft ..)
d - inside diameter )m, ft ..)