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Conversion Table - Feet of Water to Inches of Mercury
Feet of
Water
1 2 4 6 8 10 12 14 16 20 22 24 26 28 30 32 34
Inches of
Mercury 0.9 1.8 3.5 5.3 7.1 8.8 10.6 12.4 14.1 17.7 19.4 21.2 23.0 24.8 26.5 28.3 30.0
Feet Head of Water to PSI
•
One foot of water at 62°F = 0.433 PSI, to find the PSI for any feet head not given in the table, multiply the feet head by 0.433.
Feet Head
Pounds per Square Inch
1
0.43
2
0.87
3
1.30
4
1.73
5
2.17
6
2.60
7
3.03
8
3.46
9
3.90
10
4.33
15
6.50
20
8.66
25
10.83
30
12.99
40
17.32
50
21.65
60
25.99
70
30.32
80
34.65
90
38.98
100
43.31
110
47.64
120
51.97
130
56.30
140
60.63
150
64.96
160
69.29
170
73.63
180
77.96
200
86.62
250
108.27
300
129.93
350
151.58
400
173.24
500
216.55
600
259.85
700
303.16
800
346.47
900
389.78
1000
433.00
Water