Symmetrical Vertical Curve Solver

Enter the back tangent grade, forward tangent grade, and curve length. Select the known point as PVC, PVI, or PVT, then enter its station and elevation. The curve and computed points update automatically.

Inputs

g1 back tangent (%)

g2 forward tangent (%)

L (m)

Known station (m)

Known elevation (m)

Distance x from PVC (m)

PVC--

PVI--

PVT--

Elevation at x from PVC--

Selected known pointPVC

Grades are percent grades. Click a point on the figure to use that point as the station/elevation input anchor.

High/low point--

External ordinate H--

Rate of grade change--

Summary of Formulas

s1 = g1 L / (g1 - g2)

s2 = g2 L / (g2 - g1)

H = (g1 - g2) L / 8

Use grade values as decimal grades in formulas. The input boxes accept percent grades and convert them automatically.