Gallon per minute (GPM) is a crucial unit in measuring flow rate, especially in the context of plumbing, irrigation, and various industrial applications. Originally rooted in the British Imperial system, the gallon has a rich history with variations across countries—such as the US liquid gallon, which is approximately 3.785 liters, and the UK gallon, which is around 4.546 liters. This means that when considering flow rates, the distinction between these gallons can lead to significant differences in calculation and application.
What’s particularly fascinating about GPM is its pivotal role in modern sustainability efforts. For example, showerheads in the United States are often rated by their GPM to help reduce water usage and promote conservation. Low-flow fixtures, which typically limit water flow to 2.5 GPM or less, have become a standard in reducing both water waste and energy costs, highlighting the intersection of environmental responsibility and engineering.
Cubic foot per minute (CFM) is a unit that measures the flow rate of air and is widely used in various industries, from HVAC systems to automotive engineering. Understanding CFM is crucial for designing efficient ventilation systems, as it determines how much air is circulated within a specific space per minute. But did you know that the origins of measuring air flow date back to the early 20th century? Back then, engineers realized the need for standardized measurements to ensure optimal air quality and comfortable living conditions, which led to the popularization of CFM as a standard metric.
Remarkably, one cubic foot of air at room temperature weighs about 0.0807 pounds. With this knowledge, professionals can precisely calibrate systems to achieve desired airflow rates, maximize energy efficiency, and improve air quality. Whether managing the air systems in skyscrapers, homes, or cars, CFM remains a pivotal unit for ensuring environments stay fresh and healthy.
Gallons per minute | Cubic feet per minute |
---|---|
0
gal/min
|
0
ft³/min
|
10
gal/min
|
1.33681
ft³/min
|
20
gal/min
|
2.67361
ft³/min
|
30
gal/min
|
4.01042
ft³/min
|
40
gal/min
|
5.34722
ft³/min
|
50
gal/min
|
6.68403
ft³/min
|
60
gal/min
|
8.02084
ft³/min
|
70
gal/min
|
9.35764
ft³/min
|
80
gal/min
|
10.69445
ft³/min
|
90
gal/min
|
12.03126
ft³/min
|
100
gal/min
|
13.36806
ft³/min
|
110
gal/min
|
14.70487
ft³/min
|
120
gal/min
|
16.04167
ft³/min
|
130
gal/min
|
17.37848
ft³/min
|
140
gal/min
|
18.71529
ft³/min
|
150
gal/min
|
20.05209
ft³/min
|
160
gal/min
|
21.3889
ft³/min
|
170
gal/min
|
22.72571
ft³/min
|
180
gal/min
|
24.06251
ft³/min
|
190
gal/min
|
25.39932
ft³/min
|
200
gal/min
|
26.73612
ft³/min
|
210
gal/min
|
28.07293
ft³/min
|
220
gal/min
|
29.40974
ft³/min
|
230
gal/min
|
30.74654
ft³/min
|
240
gal/min
|
32.08335
ft³/min
|
250
gal/min
|
33.42016
ft³/min
|
260
gal/min
|
34.75696
ft³/min
|
270
gal/min
|
36.09377
ft³/min
|
280
gal/min
|
37.43057
ft³/min
|
290
gal/min
|
38.76738
ft³/min
|
300
gal/min
|
40.10419
ft³/min
|
310
gal/min
|
41.44099
ft³/min
|
320
gal/min
|
42.7778
ft³/min
|
330
gal/min
|
44.11461
ft³/min
|
340
gal/min
|
45.45141
ft³/min
|
350
gal/min
|
46.78822
ft³/min
|
360
gal/min
|
48.12502
ft³/min
|
370
gal/min
|
49.46183
ft³/min
|
380
gal/min
|
50.79864
ft³/min
|
390
gal/min
|
52.13544
ft³/min
|
400
gal/min
|
53.47225
ft³/min
|
410
gal/min
|
54.80906
ft³/min
|
420
gal/min
|
56.14586
ft³/min
|
430
gal/min
|
57.48267
ft³/min
|
440
gal/min
|
58.81947
ft³/min
|
450
gal/min
|
60.15628
ft³/min
|
460
gal/min
|
61.49309
ft³/min
|
470
gal/min
|
62.82989
ft³/min
|
480
gal/min
|
64.1667
ft³/min
|
490
gal/min
|
65.50351
ft³/min
|
500
gal/min
|
66.84031
ft³/min
|
510
gal/min
|
68.17712
ft³/min
|
520
gal/min
|
69.51392
ft³/min
|
530
gal/min
|
70.85073
ft³/min
|
540
gal/min
|
72.18754
ft³/min
|
550
gal/min
|
73.52434
ft³/min
|
560
gal/min
|
74.86115
ft³/min
|
570
gal/min
|
76.19796
ft³/min
|
580
gal/min
|
77.53476
ft³/min
|
590
gal/min
|
78.87157
ft³/min
|
600
gal/min
|
80.20837
ft³/min
|
610
gal/min
|
81.54518
ft³/min
|
620
gal/min
|
82.88199
ft³/min
|
630
gal/min
|
84.21879
ft³/min
|
640
gal/min
|
85.5556
ft³/min
|
650
gal/min
|
86.89241
ft³/min
|
660
gal/min
|
88.22921
ft³/min
|
670
gal/min
|
89.56602
ft³/min
|
680
gal/min
|
90.90282
ft³/min
|
690
gal/min
|
92.23963
ft³/min
|
700
gal/min
|
93.57644
ft³/min
|
710
gal/min
|
94.91324
ft³/min
|
720
gal/min
|
96.25005
ft³/min
|
730
gal/min
|
97.58686
ft³/min
|
740
gal/min
|
98.92366
ft³/min
|
750
gal/min
|
100.26047
ft³/min
|
760
gal/min
|
101.59727
ft³/min
|
770
gal/min
|
102.93408
ft³/min
|
780
gal/min
|
104.27089
ft³/min
|
790
gal/min
|
105.60769
ft³/min
|
800
gal/min
|
106.9445
ft³/min
|
810
gal/min
|
108.28131
ft³/min
|
820
gal/min
|
109.61811
ft³/min
|
830
gal/min
|
110.95492
ft³/min
|
840
gal/min
|
112.29172
ft³/min
|
850
gal/min
|
113.62853
ft³/min
|
860
gal/min
|
114.96534
ft³/min
|
870
gal/min
|
116.30214
ft³/min
|
880
gal/min
|
117.63895
ft³/min
|
890
gal/min
|
118.97576
ft³/min
|
900
gal/min
|
120.31256
ft³/min
|
910
gal/min
|
121.64937
ft³/min
|
920
gal/min
|
122.98617
ft³/min
|
930
gal/min
|
124.32298
ft³/min
|
940
gal/min
|
125.65979
ft³/min
|
950
gal/min
|
126.99659
ft³/min
|
960
gal/min
|
128.3334
ft³/min
|
970
gal/min
|
129.67021
ft³/min
|
980
gal/min
|
131.00701
ft³/min
|
990
gal/min
|
132.34382
ft³/min
|
1000
gal/min
|
133.68062
ft³/min
|
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