Roadway Engineering Calculators for Roads and Rail

Plan and check road and rail projects with calculators for curves, vehicle forces, and paving materials. Use the Railroad Curve Degree calculator to describe track curvature, or the Cornering Force calculator to estimate the force involved in a turn. The Asphalt Density calculator helps with pavement material calculations, while the Crest Vertical Curve Length calculator supports road profile design. These tools are useful for civil engineering students, roadway designers, and construction professionals who need quick estimates or want to check their work.

Railroad Curve Degree

Enter the radius of a railroad curve in feet and this calculator returns the degree of curvature — the central angle subtended by a 100 ft chord — a key parameter in railway track design and alignment.

Cornering Force

Calculate the lateral cornering force on a vehicle from the friction coefficient, mass, curve radius and road slope, and find the maximum speed before the tires lose grip. Works for banked and flat curves.

Asphalt Density

Calculate the density of asphalt or bitumen from pycnometer weighings. Enter the weights of the empty pycnometer, with bitumen, with water, and with bitumen plus water to get the density in g/cm³.

Crest Vertical Curve Length

Estimate the minimum length of a crest vertical curve from sight distance, roadway grades, driver's eye height, and object height. Enter values in meters and percent to get the required curve length in meters and feet.