Civil Engineering Reference
In-Depth Information
Table 2.4
SI units and conversion factors
To convert from
Symbol
To
Symbol
Multiply by
Length
foot
ft
meter
m
0.3048
inch
in
meter
m
0.0254
mile
mi
meter
m
1,609
Area
square foot
ft
2
m
2
square meter
0.0929
in
2
m
2
square inch
square meter
0.004645
Volume
cubic foot
ft
3
m
3
cubic meter
0.02832
in
3
m
3
cubic inch
cubic meter
0.00001639
m
3
USA liq gallon
gal
cubic meter
0.0037854
m
3
Liter
L
cubic meter
0.001
Mass
pound
lb
kilogram
kg
0.45359
t
¼
10
3
kg
ton(short)
ton
metric ton, tonne
0.9072
t
¼
10
3
kg
ton(long)
ton
metric ton, tonne
1.016
t
¼
10
3
kg
barrel(oil)
barrel
metric ton, tonne
0.137
Force
pound-force
lbf
Newton
N
4.448
kilogram-force
kgf
Newton
N
9.807
Pressure
pound-force/
square foot
lbf/ft
2
Pascal
Pa
47.8788
lbf/in
2
pound-force/
square inch
Pascal
Pa
6,895
kgf/m
2
kilogram-force/
square meter
Pascal
Pa
9.807
bar
bar
Pascal
Pa
100,000
atmosphere
atm
Pascal
Pa
101,325
mm H
2
O
mm H
2
O
Pascal
Pa
9.7739
inch H
2
O
in H
2
O
Pascal
Pa
248.7
Speed, velocity
foot/second
ft/s
meter/second
m/s
0.3048
foot/min
ft/min
meter/second
m/s
0.00508
mile/hour
mi/h
meter/second
m/s
0.4469
kilometer/hour
km/h
meter/second
m/s
0.2777
Acceleration
foot/second
2
ft/s
2
m/s
2
meter/second
0.3048
Energy, work
British thermal unit
Btu
Joule
J
1,055
foot pound-force
ft lbf
Joule
J
1.356
calorie
cal
Joule
J
4.1868
Watthour
Wh
Joule
J
3,600
Power
Btu/hour
Btu/h
Watt
W
0.2931
Btu/second
Btu/s
Watt
W
1,055
horsepower
hp
Watt
W
745.7
calorie/hour
cal/h
Watt
W
0.0011628
(continued)
