Page 17 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

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FACTORS FOR CONVERSION TO SI UNITS OF

MEASUREMENT

Multiply By To find
Length:
Inches (in) 25.400 Millimeters (mm)

Feet (ft) 0.3048 Meters (m)
Yards (yd) 0.9144 Meters (m)
Miles (mi) 1.6093 Kilometers (km)
Area:
2
2
Square inches (in ) 645.16 Square millimeters (mm )
2
2
Square feet (ft ) 0.09290 Square meters (m )
2
2
Square yards (yd ) 0.8361 Square meters (m )
2
2
Square miles (mi ) 2.5900 Square kilometers (km )
Acres (ac) 0.4047 Hectares (ha)
Mass:
Ounces (oz) 28.350 Grams (g)
Pounds (lb) 0.4536 Kilograms (kg)
Tons, short (T) 0.9072 Megagrams (Mg), or tonnes
Volume:

Ounces, fluid (oz) 29.574 Milliliters (mL)
Gallons (gal) 3.7854 Liters (L)
3
3
Cubic feet (ft ) 0.02832 Cubic meters (m )
3
3
Cubic yards (yd ) 0.07646 Cubic meters (m )
Velocity:
Miles per hour (mi/h) 1.6093 Kilometers per hour (km/h)
Force:
Pound (lb) 4.4482 Newton (N)

Kip 4.4482 Kilonewton (kN)
Stress:
2
Pounds per square inch (lb/in ) 6.8948 Kilopascal (kPa)
2
Kips per square inch (kips/in ) 6.8948 Megapascal (MPa)
2
Kips per square foot (kips/ft ) 47.880 Kilopascal (kPa)