Table A.4. Useful Conversion Factors.
From English
To Metric
Multiplied
Units
Quantity
Units
By*
Length
mile
km
1.609
yard
m
0.9144
foot
m
0.3048
inch
mm
25.40
km2
Area
square mile
2.590
m2
acre
4047
acre
hectare
0.4047
m2
square yard
0.8361
m2
square foot
0.09290
mm2
square inch
645.2
m3
1233
Volume
acre foot
m3
0.7646
cubic yard
m3
0.02832
cubic foot
L (1000 cm3)
28.32
cubic foot
m3
0.2360
100 board feet
L (1000 cm3)
3.785
gallon
cm3
16.39
cubic inch
Mass
lb
kg
0.4536
kip (1000 lb)
metric ton (1000
0.4536
kg)
Mass/unit length
plf
kg/m
1.488
Mass/unit area
kg/m2
psf
4.882
kg/m3
Mass density
pcf
16.02
Force
lb
N
4.448
kip
kN
4.448
Force/unit length
plf
N/m
14.59
klf
kN/m
14.59
Pressure, stress,
psf
Pa
47.88
modulus of elasticity
ksf
kPa
47.88
psi
kPa
6.895
ksi
MPa
6.895
N)m
Bending moment,
ft-lb
1.356
kN ) m
torque, moment of
ft-kip
1.356
force
lb ) ft
Moment of mass
m
0.1383
lb ) ft2
kg ) m2
Moment of inertia
0.04214
in4
mm4
Second moment of
416200
area
in3
mm3
Section modulus
16390
Power
ton (refrig)
kW
3.517
Btu/s
kW
1.054
hp (electric)
W
745.7
Btu/h
W
0.2931
*4 significant figures; underline denotes exact conversion
A.4
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