# Crest vertical curve length

Calculate the Crest vertical curve length with our free online tool using the input parameters: Distance, Initial Grade, Final Grade, Height

Determine the necessary length of a vertical curve using this calculator. It is primarily employed during roadway design, considering scenarios where the line of sight may exceed or fall short of the curve length.

L_m = \frac{{A \times S^2}}{{200 \times (\sqrt{h_1} + \sqrt{h_2})^2}} \quad \forall \, S < L_m

L_m = 2S - \left( \frac{{200 \times (\sqrt{h_1} + \sqrt{h_2})^2}}{{A}} \right) \quad \forall \, S > L_m

The variables used in the formula are:

`A`

– Absolute difference between g_{2} and g_{1}

`S`

– Sight Distance

`L`

– Minimum Curve Length_{m}

`h`

– Height of driver’s eye above roadway surface_{1}

`h`

– Height of object above roadway surface_{2}

The calculation of a convex-shaped vertical curve is made simpler with the help of the Crest Vertical Curve Length Calculator.