Hazen-Williams Calculator
Flow Rate (
Q
, in gallons per minute):
Hazen-Williams Coefficient (
C
):
Pipe Inner Diameter (
d
, in inches):
Calculate
Clear Form
Clear History
Calculation History
Pipe Inner Diameter
Size
SCH 10
SCH 40
TYPE K
TYPE L
TYPE M
1"
1.097
1.049
0.995
1.025
1.055
1.25"
1.442
1.38
1.245
1.265
1.291
1.5"
1.682
1.61
1.481
1.505
1.527
2"
2.157
2.067
1.959
1.985
2.009
2.5"
2.635
2.469
2.435
2.465
2.495
3"
3.26
3.068
2.907
2.945
2.981
4"
4.26
4.026
3.857
3.905
3.935
6"
6.357
6.065
5.741
5.845
5.881
8"
8.249
7.981
7.583
7.725
7.785
10"
10.37
10.02
9.449
9.625
9.701
