Velocity (fps) to Flow (gpm) Conversion Table
For Schedule 40, 80 & 10 Pipe

Schedule 40
Velocity (fps)
Nominal
Size
Actual
I.D.
0.5
1
2
3
4
5
6
8
10
15
20
1/8"
 0.269
0.09
0.18
0.35
0.53
0.71
0.89
1.06
1.42
1.77
2.66
3.55
1/4"
 0.364
0.16
0.32
0.65
0.97
1.30
1.62
1.95
2.60
3.25
4.87
6.49
3/8"
 0.493
0.30
0.60
1.19
1.79
2.38
2.98
3.57
4.76
5.95
8.93
11.91
1/2"
 0.622
0.47
0.95
1.90
2.84
3.79
4.74
5.69
7.58
9.48
14.22
18.96
3/4"
 0.824
0.83
1.66
3.33
4.99
6.65
8.32
9.98
13.31
16.63
24.95
33.27
1"
 1.049
1.3
2.7
5.39
8.09
10.78
13.48
16.18
21.57
26.96
40.44
53.92
1.5"
 1.610
3.2
6.4
12.70
19.05
25.40
31.75
38.10
50.81
63.51
95.26
127.01
2.0"
 2.067
5.2
10.5
20.94
31.40
41.87
52.34
62.81
83.74
104.68
157.01
209.35
2.5"
 2.469
7.5
14.9
29.87
44.81
59.74
74.68
89.61
119.48
149.35
224.03
298.70
3.0"
 3.068
11.5
23.1
46.12
69.18
92.24
115.30
138.37
184.49
230.61
345.91
461.22
4.0"
 4.026
19.9
39.7
79.42
119.13
158.85
198.56
238.27
317.69
397.11
595.67
794.23
5.0"
 5.047
31.2
62.4
124.81
187.22
249.63
312.03
374.44
499.26
624.07
936.10
1248.14
6.0"
 6.065
45.1
90.1
180.24
270.36
360.49
450.61
540.73
720.97
901.21
1351.82
1802.43
8.0"
 7.981
78.0
156.1
312.11
468.17
624.22
780.28
936.34
1248.45
1560.56
2340.84
3121.12
10.0"
 10.020
123.0
246.0
491.96
737.94
983.92
1229.90
1475.89
1967.85
2459.81
3689.71
4919.62
12.0"
 12.000
176.4
352.8
705.60
1058.40
1411.20
1764.00
2116.80
2822.40
3528.00
5292.00
7056.00
14.0"
 13.250
215.1
430.1
860.26
1290.38
1720.51
2150.64
2580.77
3441.03
4301.28
6451.92
8602.56
16.0"
 15.250
284.9
569.8
1139.56
1709.33
2279.11
2848.89
3418.67
4558.23
5697.78
8546.67
11395.56
18.0"
 17.250
364.5
729.0
1458.06
2187.08
2916.11
3645.14
4374.17
5832.23
7290.28
10935.42
14580.56
20.0"
 19.250
453.9
907.9
1815.76
2723.63
3631.51
4539.39
5447.27
7263.03
9078.78
13618.17
18157.56
24.0"
 23.250
662.2
1324.4
2648.76
3973.13
5297.51
6621.89
7946.27
10595.03
13243.78
19865.67
26487.56
30.0"
 29.250
1048.1
2096.1
4192.26
6288.38
8384.51
10480.64
12576.77
16769.03
20961.28
31441.92
41922.56
36.0"
 35.250
1522.1
3044.3
6088.56
9132.83
12177.11
15221.39
18265.67
24354.23
30442.78
45664.17
60885.56
42.0"
 41.250
2084.4
4168.8
8337.66
12506.48
16675.31
20844.14
25012.97
33350.63
41688.28
62532.42
83376.56
48.0"
 47.250
2734.9
5469.8
10939.56
16409.33
21879.11
27348.89
32818.67
43758.23
54697.78
82046.67
109395.56

Schedule 80
Velocity (fps)
Nominal
Size
Actual
I.D.
0.5
1
2
3
4
5
6
8
10
15
20
1/8"
 0.215 0.06 0.11 0.23 0.34 0.45 0.57 0.68 0.91 1.13 1.70 2.27
1/4"
 0.302 0.11 0.22 0.45 0.67 0.89 1.12 1.34 1.79 2.23 3.35 4.47
3/8"
 0.423 0.22 0.44 0.88 1.32 1.75 2.19 2.63 3.51 4.38 6.58 8.77
1/2"
 0.546 0.37 0.73 1.46 2.19 2.92 3.65 4.38 5.84 7.30 10.96 14.61
3/4"
 0.742 0.67 1.35 2.70 4.05 5.40 6.74 8.09 10.79 13.49 20.23 26.98
1"
 0.957 1.1 2.2 4.49 6.73 8.98 11.22 13.46 17.95 22.44 33.66 44.88
1.5"
 1.500 2.8 5.5 11.03 16.54 22.05 27.56 33.08 44.10 55.13 82.69 110.25
2.0"
 1.939 4.6 9.2 18.42 27.63 36.85 46.06 55.27 73.69 92.11 138.17 184.23
2.5"
 2.323 6.6 13.2 26.44 39.66 52.88 66.11 79.33 105.77 132.21 198.32 264.42
3.0"
 2.900 10.3 20.6 41.21 61.81 82.42 103.02 123.63 164.84 206.05 309.07 412.09
4.0"
 3.826 17.9 35.9 71.73 107.59 143.46 179.32 215.18 286.91 358.64 537.96 717.28
5.0"
 4.813 28.4 56.8 113.51 170.26 227.02 283.77 340.53 454.03 567.54 851.31 1135.08
6.0"
 5.761 40.7 81.3 162.63 243.94 325.25 406.57 487.88 650.51 813.13 1219.70 1626.27
8.0"
 7.625 71.2 142.4 284.89 427.33 569.78 712.22 854.67 1139.56 1424.45 2136.67 2848.89
10.0"
 9.750 116.5 232.9 465.81 698.71 931.61 1164.52 1397.42 1863.23 2329.03 3493.55 4658.06
12.0"
 11.750 169.1 338.3 676.51 1014.76 1353.01 1691.27 2029.52 2706.03 3382.53 5073.80 6765.06
14.0"
 13.000 207.0 414.1 828.10 1242.15 1656.20 2070.25 2484.30 3312.40 4140.50 6210.75 8281.00
16.0"
 15.000 275.6 551.3 1102.50 1653.75 2205.00 2756.25 3307.50 4410.00 5512.50 8268.75 11025.00
18.0"
 17.000 354.0 708.1 1416.10 2124.15 2832.20 3540.25 4248.30 5664.40 7080.50 10620.75 14161.00
20.0"
 19.000 442.2 884.5 1768.90 2653.35 3537.80 4422.25 5306.70 7075.60 8844.50 13266.75 17689.00
24.0"
 23.000 648.0 1296.1 2592.10 3888.15 5184.20 6480.25 7776.30 10368.40 12960.50 19440.75 25921.00
30.0"
 29.000 1030.2 2060.5 4120.90 6181.35 8241.80 10302.25 12362.70 16483.60 20604.50 30906.75 41209.00
36.0"
 35.000 1500.6 3001.3 6002.50 9003.75 12005.00 15006.25 18007.50 24010.00 30012.50 45018.75 60025.00
42.0"
 42.000 2160.9 4321.8 8643.60 12965.40 17287.20 21609.00 25930.80 34574.40 43218.00 64827.00 86436.00
48.0"
 48.000 2822.4 5644.8 11289.60 16934.40 22579.20 28224.00 33868.80 45158.40 56448.00 84672.00 112896.00

Schedule 10
Velocity (fps)
Nominal
Size
Actual
I.D.
0.5
1
2
3
4
5
6
8
10
15
20
1/8"
 0.307 0.12 0.23 0.46 0.69 0.92 1.15 1.39 1.85 2.31 3.46 4.62
1/4"
 0.410 0.21 0.41 0.82 1.24 1.65 2.06 2.47 3.29 4.12 6.18 8.24
3/8"
 0.545 0.36 0.73 1.46 2.18 2.91 3.64 4.37 5.82 7.28 10.92 14.55
1/2"
 0.674 0.56 1.11 2.23 3.34 4.45 5.56 6.68 8.90 11.13 16.69 22.26
3/4"
 0.884 0.96 1.91 3.83 5.74 7.66 9.57 11.49 15.32 19.15 28.72 38.29
1"
 1.097 1.5 2.9 5.90 8.85 11.79 14.74 17.69 23.59 29.48 44.23 58.97
1.5"
 1.682 3.5 6.9 13.86 20.79 27.73 34.66 41.59 55.45 69.31 103.97 138.63
2.0"
 2.157 5.7 11.4 22.80 34.20 45.60 56.99 68.39 91.19 113.99 170.98 227.98
2.5"
 2.635 8.5 17.0 34.02 51.03 68.04 85.05 102.07 136.09 170.11 255.16 340.22
3.0"
 3.260 13.0 26.0 52.08 78.11 104.15 130.19 156.23 208.30 260.38 390.56 520.75
4.0"
 4.260 22.2 44.5 88.92 133.38 177.85 222.31 266.77 355.69 444.62 666.92 889.23
5.0"
 5.295 34.3 68.7 137.38 206.07 274.76 343.45 412.14 549.53 686.91 1030.36 1373.81
6.0"
 6.357 49.5 99.0 198.02 297.02 396.03 495.04 594.05 792.06 990.08 1485.12 1980.16
8.0"
 8.329 85.0 170.0 339.92 509.89 679.85 849.81 1019.77 1359.70 1699.62 2549.43 3399.24
10.0"
 10.420 133.0 266.0 532.02 798.04 1064.05 1330.06 1596.07 2128.10 2660.12 3990.18 5320.24
12.0"
 12.390 188.1 376.1 752.21 1128.31 1504.42 1880.52 2256.63 3008.84 3761.05 5641.57 7522.09
14.0"
 13.625 227.4 454.8 909.64 1364.46 1819.28 2274.10 2728.92 3638.56 4548.20 6822.29 9096.39
16.0"
 15.625 299.1 598.1 1196.29 1794.43 2392.58 2990.72 3588.87 4785.16 5981.45 8972.17 11962.89
18.0"
 17.625 380.5 761.1 1522.14 2283.21 3044.28 3805.35 4566.42 6088.56 7610.70 11416.04 15221.39
20.0"
 19.564 468.9 937.7 1875.48 2813.21 3750.95 4688.69 5626.43 7501.90 9377.38 14066.07 18754.75
24.0"
 23.500 676.5 1353.0 2706.03 4059.04 5412.05 6765.06 8118.08 10824.10 13530.13 20295.19 27060.25


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