Table 1. Conversion Multipliers
Length
inch
foot
mile
cm
meter
kmeter
1
0.0833
1.58E-05
2.54
0.0254
2.54E-05
12
1
1.89E-05
30.48
0.3048
3.05E-04
63,360
5,280
1
160.934
1,609.34
1.60934
0.3937
0.0328
6.21E-06
1
0.01
1.00E-05
39,370
3.2808
6.21E-04
100
1
0.001
39,370
3,281
0.6214
100,000
1,000
1
ounce
pound
kgram
ton (short)
ton (long)
tonne (metric)
1
0.0625
0.0283
3.125E-05
2.970E-05
2.835E-05
16
1
0.4536
5.000E-04
4.464E-04
4.536E-04
35.2741
2.2046
1
0.0011
9.842E-04
0.0010
32,000
2,000
907.1800
1
0.8929
0.9072
35,840
2,240
1,016
1.1200
1
1.0160
35,274
2,205
1,000
1.1023
0.9842
1
sq in.
sq ft
acre
sq m
hectare
1
0.0069
1.594E-07
6.452E-04
6.452E-08
144
1
2.296E-05
0.0929
9.290E-06
6.273E+06
43,560
1
4,046.9
0.4047
1,550
10.7639
2.471E-04
1
1.000E-04
1.550E+07
107,639
2.4711
10,000
1
cu in.
cu ft
gallon
bushel
liter
cu m
1
5.787E-04
0.0043
4.650E-04
0.0164
1.639E-05
1728
1
7.4805
0.8036
28.3168
0.0283
231
0.1337
1
0.1074
3.7854
0.0038
2150.44
1.2445
9.3093
1
35.2394
0.0352
61.0237
0.0353
0.2642
0.0284
1
0.001
61,024
35.315
264.17
28.377
1000
1
Weight
Area
Volume
1
Bulk
Density
pound/cu in. pound/cu ft
pound/cu yd
pound/gallon g/cu cm
kg/cu m
1
1728
46656
231.00
27.6798
27679.76
5.787E-04
1
27
0.1337
0.0160
16.0184
2.143E-05
0.0370
1
0.0050
5.9327E-04
0.5933
4.329E-03
7.481
201.9740
1
0.1198
119.8458
0.0361
62.4283
1685.564
8.3454
1
1000
3.613E-05
0.0624
1.6856
0.0083
0.001
1
pound/sec
pound/hr
ton (short)/hr
kg/sec
kg/hr
1
3600
1.80
0.4536
1632.9
2.778E-04
1
5.000E-04
1.260E-04
0.4536
0.5556
2000
1
0.25199
907.1800
2.2046
7,937
3.9683
1
3600
6.124E-04
2.2046
0.0011
2.778E-04
1
cu ft/sec
cu ft/min (cfm)
gallons/hr
cu meters/sec liters/sec
1
60.0
26929.9
0.0283
28.3166
0.0167
1
448.83
4.719E-04
0.4719
3.713E-05
0.0022
1
1.051E-06
0.0011
35.3150
2118.9
9.510E+05
1
1000
0.0353
2.1189
954.026
1.000E-03
1
psi
in. water
in. Hg
mm Hg
atmospheres Pascals
1
27.708
2.0360
51.7145
0.0680
6894.7
0.0361
1
0.0735
1.8664
0.0025
248.84
0.4912
13.6090
1
25.4
0.0334
3396.4
0.0193
0.5358
0.0394
1
0.0013
133.32
14.696
407.1984
29.9213
760
1
1.013E+05
1.450E-04
0.0040
2.953E-04
0.0075
9.869E-06
1
Mass
Flow Rate
Volume
Flow Rate
Pressure
2
Power
BTU/hr
ft-lb/min
Kcal/hr
mechanical
horsepower
boiler
horsepower
kW
1
12.9695
0.2520
3.930E-04
2.988E-05
2.931E-04
0.0771
1
0.0194
3.030E-05
2.304E-06
2.260E-05
3.9683
51.4663
1
0.0016
1.186E-04
0.001163
2,544
33,000
641.196
1
0.0760
0.7457
33,470
434,089
8,434
13.1542
1
9.8091
3,412
44,254
859.859
1.3410
0.1019
1
BTU
ft-lb
kCal
kJoule
hp-hr
kW-hr
1
778.17
0.25200
1.0551
3.930E-04
2.931E-04
0.0013
1
0.0003
0.0014
5.051E-07
3.766E-07
3.9683
3,088
1
4.1868
0.0016
0.0012
0.9478
737.563
0.2388
1
3.725E-04
2.778E-04
2,544
1,979,999
641.19
2684.5
1
0.7457
3,412
2,655,225
859.85
3,600
1.341
1
Energy
Energy
Density
BTU/pound
BTU/ton (short) kCal/kg
kJoule/kg
MJoule/kg
1
2000
0.5556
2.3260
0.0023
5.000E-04
1
1111.112
4652.004
4.6520
1.8000
9.000E-04
1
4.1868
0.0042
0.4299
2.150E-04
0.2388
1
0.001
429.922
0.2150
238.8459
1000
1
BTU/sq ft
BTU/ac
kJ/sq m
KJ/ha
1
43560
11.3574
113574
2.2957E-05
1
2.61E-04
2.608
0.08805
3835.7
1
10000
8.805E-06
0.38357
0.0001
1
Energy
Yield
3
Table 2. SI Prefixes
Prefix
Symbol
Multiplying Factor
Exa
E
1018
Peta
P
1015
Tera
T
1012
Giga
G
109
Mega
M
106
Kilo
K
103
Milli
m
10-3
Micro
µ
10-6
Nano
n
10-9
Pico
p
10-12
Femto
f
10-15
Atto
a
10-18
No single conversion factor can be used to convert temperatures in the English system
(degrees Fahrenheit or degrees Rankine) to temperatures in the SI system (degrees
Celsius and degrees Kelvin) or the other way around. The equations for converting
temperatures and temperature difference from one system to another are presented in
Table 3.
Table 3. Equations for Temperature Conversions
F = (9/5) x C + 32
C = (5/9) x (F-32) = (F-32)/1.8
R = F + 460
K = C + 273
ΔT (F) = ΔT (C) / 1.8
ΔT (F) = ΔT (C) x 0.556
T (C) = T (K)
T (F) = T (R)
ΔT (F) = ΔT (K) / 1.8
ΔT (R) = ΔT (C) / 1.8
F = degrees Fahrenheit; C = degrees Celcius; R = degrees Rankine; K = degrees Kelvin;
ΔT = temperature difference
1 kg/m3 = 0.0624 lb/ft3
1 J/(kg K) = 2.389x10-4 kcal/(kg oC) = 2.389x10-4 Btu/(lbm oF)
1 W/(m K) = 0.85984 kcal/(h m oC) = 0.5779 Btu/(ft h oF) = 0.048 Btu/(in h oF)
4
5