OPERATION 5
en-55
How to calculate a slope:
Tools Required:
Level (A), either 1 yard, or 1 meter long.
Tape measure (B).
Use the level (A) and position it horizontally to measure the
distance (C) with tape measure (B). Use the chart to
calculate the slope angle or the percentage grade of the
slope (D).
Height (C) Result (D)
Inches with 1 Yard Level (A) Millimeters with 1 Meter Level (A) Slope in Degrees Slope Grade %
3
4.8 8.3
100 5.7 10.0
150 8.5 15
6 9.5 16.7
200 11.3 20.0
7.5 11.8 20.8
225 12.7 22.5
9 250 14 25.0
275 15.4 27.5
10 15.5 27.8
300 16.7 30.0
11
17.0 30.6
325 18.0 32.5
12
18.4 33.3
350 19.3 35.0
13
19.9 36.1
375 20.6 37.5
14
21.3 38.9
400 21.8 40.0
15 22.6 41.7
425 23.0 42.5
16
24 44.4
475 25.4 47.5
18 500 26.6 50.0
20
29.1 55.6
600 31.0 60.0
25
34.8 69.4
800 38.7 80.0
30
39.8 83.3
900 42.0 90
36 1000 45.0 100
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