Fence Line Length and Grade Slope Calculator
Calculate the true slope length of a fence line, grade percentage, slope angle, and number of posts needed based on horizontal distance and elevation change.
Formulas Used
True Slope Length (Pythagorean Theorem):
L = √(H² + R²)
where H = horizontal distance, R = rise (elevation change).
Grade Percentage:
G% = (R ÷ H) × 100
Slope Angle:
θ = arctan(R ÷ H)
Posts per Run:
Posts = floor(L ÷ spacing) + 1
Fence Panels per Run:
Panels = Posts − 1
Assumptions & References
- Sections are treated as independent runs; shared corner/end posts between sections are not deducted automatically.
- Formula reference: Pythagorean theorem (Euclid, Elements, Book I, Proposition 47).