Vertical Curve Calculator
Calculate parabolic vertical curve elevations, K-value, high/low point, and minimum length for crest and sag curves using AASHTO standards.
Inputs
%
%
ft
ft
ft
mph
Results
Curve Type
Crest
K-Value
120
Grade Difference (A)5%
Min. Length (AASHTO)557 ft
Length Adequate?Yes ā meets AASHTO minimum
BVC Station4,700 ft
BVC Elevation491 ft
EVC Station5,300 ft
EVC Elevation494 ft
High/Low Point Station4,880 ft
High/Low Elevation493.7 ft
R-0.01
How to Use This Calculator
- Enter the incoming grade (G1) and outgoing grade (G2) as percentages.
- Set the length of the vertical curve L in stations (100 ft each).
- Input the PVI elevation and station.
- Review the BVC and EVC stations and elevations, and the High or Low Point location.
- Use the Elevation at each station table to set grade stakes in the field.
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