Below are what we think are the most common conversions Americans will need when working abroad. All in one page. These conversions also work for non-Americans working in the US.
Common I-P Values Converted to SI
Air Flow
1,000 CFM = 472 L/s
Water Flow
5 GPM = 0.32 L/s
10 GPM = 0.63 L/s
20 GPM = 1.26 L/s
Temperature
40° F = 4.4° C
41° F = 5° C
42° F = 5.6° C
43° F = 6.1° C
44° F = 6.7° C
45° F = 7.2° C
46° F = 7.8° C
47° F = 8.3° C
48° F = 8.9° C
49° F = 9.5° C
50° F = 10° C
51° F = 10.6° C
52° F = 11.1° C
53° F = 11.7° C
54° F = 12.2° C
55° F = 12.8° C
56° F = 13.3° C
57° F = 13.9° C
58° F = 14.5° C
59° F = 15° C
60° F = 16.6° C
61° F = 16.1° C
62° F = 16.7° C
63° F = 17.2° C
64° F = 17.8° C
65° F = 18.3° C
66° F = 18.9° C
67° F = 19.5° C
68° F = 20° C
69° F = 20.6° C
70° F = 21.1° C
71° F = 21.7° C
72° F = 22.2° C
73° F = 22.8° C
74° F = 23.3° C
75° F = 23.9° C
76° F = 24.5° C
77° F = 25° C
78° F = 25.6° C
79° F = 26.1° C
80° F = 26.7° C
81° F = 27.2° C
82° F = 27.8° C
83° F = 28.3° C
84° F = 28.9° C
85° F = 29.5° C
86° F = 30° C
87° F = 30.6° C
88° F = 31.1° C
89° F = 31.7° C
90° F = 32.2° C
91° F = 32.8° C
92° F = 33.3° C
93° F = 33.9° C
94° F = 34.5° C
95° F = 35° C
96° F = 35.6° C
97° F = 36.1° C
98° F = 36.6° C
99° F = 37.2° C
100° F = 37.8° C
101° F = 38.3° C
102° F = 38.9° C
103° F = 39.5° C
104° F = 40° C
105° F = 40.6° C
106° F = 41.1° C
107° F = 41.7° C
108° F = 42.2° C
109° F = 42.8° C
110° F = 43.3° C
Pressure (Duct)
1 in H2O = 249 Pa
2 in H2O = 498 Pa
4 in H2O = 995 Pa
Pressure (Atmospheric)
14.696 psi = 101.33 kPa
Power
1 hp = 0.746 kW
2 hp = 1.491 kW
3 hp = 2.237 kW
5 hp = 3.729 kW
7.5 hp = 5.593 kW
10 hp = 7.457 kW
15 hp = 11.186 kW
20 hp = 14.914 kW
25 hp = 18.643 kW
30 hp = 22.371 kW
40 hp = 29.828 kW
50 hp = 37.285 kW
Heating Capacity
199 kBTU/hr = 58.3 kW
1,000 kBTU/hr = 293 kW
Cooling Capacity
1 tons = 3.5 kW
2 tons = 7 kW
3 tons = 10.6 kW
4 tons = 14.1 kW
5 tons = 17.6 kW
6 tons = 21.1 kW
7 tons = 24.6 kW
8 tons = 28.1 kW
9 tons = 31.7 kW
10 tons = 35.2 kW
15 tons = 52.8 kW
20 tons = 70.3 kW
25 tons = 87.9 kW
30 tons = 105.5 kW
35 tons = 123.1 kW
40 tons = 140.7 kW
45 tons = 158.3 kW
50 tons = 175.9 kW
55 tons = 193.4 kW
60 tons = 211 kW
65 tons = 228.6 kW
70 tons = 246.2 kW
75 tons = 263.8 kW
80 tons = 281.4 kW
85 tons = 298.9 kW
90 tons = 316.5 kW
95 tons = 334.1 kW
100 tons = 351.7 kW
200 tons = 703.4 kW
300 tons = 1055.1 kW
400 tons = 1406.8 kW
500 tons = 1758.5 kW
600 tons = 2110.2 kW
700 tons = 2461.2 kW
800 tons = 2813.6 kW
900 tons = 3165.3 kW
1000 tons = 3517 kW
Illuminance
30 fc = 323 lx
50 fc = 538 lx
100 fc = 1,076 lx