Horizontal Curve Layout Calculator
Calculate horizontal curve elements including radius, arc length, tangent, chord, external distance, and middle ordinate for highway and road design.
Inputs
ft
°
+00
Results
Radius (R)
1,000 ft
Arc Length (L)
523.6 ft
Tangent (T)267.95 ft
Long Chord (C)517.64 ft
External (E)35.28 ft
Middle Ordinate (M)34.07 ft
Degree of Curve5.73°
PC Station732.05 ft
PT Station1,255.65 ft
Sight Distance219.2
How to Use This Calculator
- Enter the intersection angle (delta) in degrees, minutes, and seconds.
- Input the radius in feet for the horizontal curve.
- Set the station of the Point of Curvature (PC).
- Review the Tangent Length, Length of Curve, Chord, Middle Ordinate, and Station of PT.
- Use the staking interval to calculate stations along the curve for field layout.
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