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5
OPERATION
How to calculate a slope:
Tools Required:
Level (A), either 1 yard, or 1 meter long.
Tape measure (B).
With the level (A) positioned horizontally, measure the
distance (C) with tape measure (B). Use the chart to
calculate either the slope angle or the % grade of the
slope (D).
Inches with 1 Yard Level (A)
3
6
7.5
9
10
11
12
13
14
15
16
18
20
25
30
36
28
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Height (C)
Millimeters with 1 Meter Level (A)
100
150
200
225
250
275
300
325
350
375
400
425
475
500
600
800
900
1000
B
A
C
D
Result (D)
Slope in Degrees
4.8
5.7
8.5
9.5
11.3
11.8
12.7
14
15.4
15.5
16.7
17.0
18.0
18.4
19.3
19.9
20.6
21.3
21.8
22.6
23.0
24
25.4
26.6
29.1
31.0
34.8
38.7
39.8
42.0
45.0
Figure 5D
Slope Grade %
8.3
10.0
15
16.7
20.0
20.8
22.5
25.0
27.5
27.8
30.0
30.6
32.5
33.3
35.0
36.1
37.5
38.9
40.0
41.7
42.5
44.4
47.5
50.0
55.6
60.0
69.4
80.0
83.3
90
100
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