For reference only — not a substitute for professional engineering judgement. See Terms.
Enter any value — the others calculate automatically. Shaded fields are calculated; white fields are user-entered.
Radius
m
ft
chains
°/100 ft
Formula reference & definitions
Unit conversion:
1 ft = 0.3048 m 1 chain = 20.1168 m
Degree of curvature — 100 ft arc definition (railway standard):
D = 5729.578 / Rft (°/100 ft) ≡ 1746.4 / Rm