Change of Grade on Roadways Calculator – What is Rate of change?

• Length of Curve (L)

  m ft

• Initial Roadway Grade (g₁)

  %

• Final Roadway Grade (g₂)

  %

•  

• Rate of change of grade (r)

  

• Rate of change of grade (r)

  

Formula:

r = (g₂ − g₁) / L

  Where,

    r - Rate of change of grade

    g₁ - Initial roadway grade

    g₂ - Final roadway grade

    L - Length of the curve

Grade is a basic element of vertical alignment and more effective for trucks than cars and includes speed differentials between vehicle types calculate change of grade using this free calculator.