The table below contains some of the most commonly used conversion factors in structural engineering:

LengthMile (mi)1.609 kilometer (km)
Yard (yd)0.914 meter (m)
Foot (ft)0.304 meter (m)
304.8 millimeter (mm)
Inch (in)25.4 millimeter (mm)
Mil (mil)25.4 microns (μm)
AreaSquare mile (mi2)2.590 square kilometer (km^2)
Acre (ar)4047 square meter (m^2)
Square yard (yd^2)0.836 square meter (m^2)
Square foot (ft^2)0.093 square meter (m^2)
Square inch (in^2)645.2 square millimeter (mm^2)
VolumeCubic yard (yd^3)0.765 cubic meter (m^3)
Cubic foot (ft^3)0.028 cubic meter (m^3)
Cubic inch (in^3)16390 cubic millimeter (mm^3)
16.39 milliliter (ml)
U.S. gallon (gal)3.785 liters (l)
Velocity, SpeedFoot per second (ft/s)0.305 meter per second (m/s)
Mile per hour (mi/h)1.609 kilometer per hour (km/h)
0.447 meter per second (m/s)
MassShort ton (2000 lb)0.907 metric ton (M.T.)
907.2 kilogram (kg)
Pound (lb)0.454 kilogram (kg)
Ounce (oz)28.35 gram (g)
PressurePound per square foot (lb/ft^2)4.883 kilogram per square meter (kg/m^2)
47.88 newton per square meter (N/m^2)
DensityPound per cubic foot (lb/ft^3)16.02 kilogram per cubic meter (kg/m^3)
Ton per cubic yard (ton/yd^3)1.187 metric ton per cubic meter (M.T./m^3)
ForceTon-force (tonf)8.896 kilonewton (kN)
KIPS (KIP)4.448 kilonewton (kN)
Pound-force (lbf)4.448 newton (N)
Moment or TorquePound-force-foot (lbf.ft)1.356 newton-meter (N.m)
Pound-force-inch (lbf.in)0.113 newton-meter (N.m)
KIPS-foot (KIP.ft)1.356 kilonewton-meter (kN.m)
Force per Unit LengthPound per foot (lb/ft)14.59 newton per meter (N/m)
StressKIPS per square inch (ksi)0.690 kilonewton per square centimeter (kN/cm^2)
Work, Energy & HeatBritish thermal unit (Btu)1055 joules (J)
Pound-foot (lbf.ft)1.356 joules (J)
Heat TransferBritish thermal unit per square foot hour degree fahrenheit (Btu/ft2 hr.°F)5.678 watt per square meter kelvin (W/m^2.K)
Thermal ConductivityBritish thermal unit per foot hour degree fahrenheit (Btu/ft. hr.°F)1.731 watt per meter kelvin (W/m.K)

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