ENGINEERING MANUAL OF AUTOMATIC CONTROL
GENERAL ENGINEERING DATA
475
CONVERSION FORMULAS AND TABLES
PRESSURE
Table 4 lists converted values for psi to kPa using the 6.8948
factor then rounding off to the nearest whole number.
Table 4. Psi to kPa Conversion.
Table 5. Pressure Conversion Multipliers.
EXAMPLE:
24 psi x 6.8948 = 165.48 kilopascals
GENERAL
The conversion multiplier tables in this section provide
conversion factors. When the existing unit is multiplied by the
conversion factor, the result is the desired unit.
METRIC PREFIXES
Table 3. Metric Prefixes.
Psi kPa Psi kPa
1
2
3
4
5
7
14
21
28
34
16
17
18
19
20
110
117
124
131
138
6
7
8
9
10
41
48
55
62
69
21
22
23
24
25
145
152
159
165
172
11
12
13
14
15
76
83
90
97
103
26
27
28
29
30
179
186
193
200
207
EXAMPLES:
14 kilocalories = 1 x 10
3
calories = 14,000 calories
1 milliliter = 1 x 10
-3
liter = 0.001 liter
Prefix Symbol Conversion Factor
giga G 10
9
1,000,000,000
mega M 10
6
1,000,000
kilo k 10
3
1,000
hecto h 10
2
100
deca da 10
1
10
deci d 10
–1
0.1
centi c 10
–2
0.01
milli m 10
–3
0.001
micro µ 10
–6
0.000 001
nano n 10
–9
0.000 000 001
Desired Unit
Existing Unit
Pounds
per
Sq In.
(psi)
Kilo-
pascals
(kPa)
Ounces
per
Sq In.
Milli-
meters
of
Mercury
Kilogram-
force
per cm
2
Inches
of
Water
Inches
of
Mercury
Feet of
Water Bar
Pounds per
Sq In. (psi)
— 6.8948 16.0 51.7 0.0703 27.68 2.036 2.307 0.068948
Kilopascals (kPa) 0.1450 — 2.3207 7.503 0.0102 4.014 0.2952 0.3346 0.01
Ounces per Sq In. 0.0625 0.4309 — 3.23 0.004395 1.73 0.127 0.144 0.004309
Millimeters of
Mercury
0.0193 0.1333 0.3094 — 0.00136 0.5354 0.0394 0.04461 0.001333
Kilogram-force
per cm
2
14.22 98.09 228.0 735.6 — 393.7 28.96 32.81 0.9809
Inches of Water 0.0361 0.2491 0.578 1.865 0.00254 — 0.0735 0.0833 0.002491
Inches of Mercury 0.4912 3.387 7.86 25.4 0.03453 13.60 — 1.133 0.03387
Feet of Water 0.4335 2.989 6.928 22.42 0.0305 12.0 0.8826 — 0.02989
Bar 14.5 100 232.072 750.188 1.0195 401.445 29.525 33.456 —
Absolute Pressure = Gage Pressure + 14.74 psi
= Gage Pressure + 101.325 kPa.
1 pascal = 1 newton per square meter
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