Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Office of Planning, Environment, & Realty (HEP)
PlanningEnvironmentReal Estate

HEP Events Guidance Publications Awards Contacts

Wetland Trail Design and Construction

USDA Forest Service logo   Table of Contents

Back | Next
Forest Service Technology & Development logo

Appendix B-Slope Conversion Table


Slope Conversion Table
Percent grade ¹Slope ²Pitch
0.5 1 ft per 200 ft 1/16 in per 1 ft
1 1 ft per 100 ft 1/8 in per 1 ft
2 1 ft per 50 ft ¼ in per 1 ft
2.5 1 ft per 40 ft 5/16 in per 1 ft
3 1 ft per 33 ft 3/8 in per 1 ft
3.3 1 ft per 30 ft 7/16 in per 1 ft
4 1 ft per 25 ft ½ in per 1 ft
5 1 ft per 20 ft 5/8 in per 1 ft
6 1 ft per 16.5 ft ¾ in per 1 ft
7 1 ft per 14.3 ft 7/8 in per 1 ft
8 1 ft per 12.5 ft 1 in per 1 ft
8.33 1 ft per 12 ft 1 in per 1 ft

¹One unit of climb or descent per 100 units of horizontal distance.

²Number of vertical inches per horizontal foot. Vertical inches shown are rounded
off to the nearest one-sixteenth of an inch.

Maximum grade recommended for wood surface trails = 2 percent.

Maximum grade recommended for accessible trails = 5 percent.

Maximum grade recommended for accessible ramps = 8.33 percent.


USDA Forest Service logo Top

Back | Next

Table of Contents

Cover Page
Forest Service Technology & Development logo
Updated: 04/14/2014
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000