Calculate parameters for road vertical curves (gradients).
Curve Data
Curve Properties
Calculate Curve
Enter incoming and outgoing gradients and length.
About this calculator
Overview
Used in highway engineering, this calculator determines the properties of the parabolic curve connecting two different road gradients (slopes). It ensures safe and comfortable transitions.
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Pro Tips
G1 is positive for uphill, negative for downhill.
Length L is typically the horizontal projection, not the arc length.
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Fun Facts
"Sag curves are at the bottom of a hill; Crest curves are at the top."
"The K-value represents the horizontal distance required to effect a 1% change in slope."
"Stopping sight distance is a critical factor in vertical curve design."
