To convert from to multiply by
mile (US Statute) kilometer (km) 1.609347
inch (in) millimeter (mm) 25.4 *
inch (in) centimeter (cm) 2.54 *
inch (in) meter (m) 0.0254 *
foot (ft) meter (m) 0.3048 *
yard (yd) meter (m) 0.9144 *
Area Conversion Factors
To convert from to multiply by
square foot (sq ft) square meter (sq m) 0.09290304 E
square inch (sq in) square meter (sq m) 0.00064516 E
square yard (sq yd) square meter (sq m) 0.83612736 E
acre (ac) hectare (ha) 0.4047
Volume Conversion Factors
To convert from to multiply by
cubic inch (cu in) cubic meter (cu m) 0.00001639
cubic foot (cu ft) cubic meter (cu m) 0.02831685
cubic yard (cu yd) cubic meter (cu m) 0.7645549
gallon (gal) liter 4.546
Canada liquid
gallon (gal) cubic meter (cu m) 0.004546
Canada liquid
gallon (gal) liter 3.7854118
U.S. liquid**
gallon (gal) cubic meter (cu m) 0.00378541
U.S. liquid
fluid ounce (fl oz) milliliters (ml) 29.57353
fluid ounce (fl oz) cubic meter (cu m) 0.00002957
Force Conversion Factors
To convert from to multiply by
kip (1000 lb) kilogram (kg) 453.6
kip (1000 lb) newton (N) 4,448.222
pound (lb) kilogram (kg) 0.4535924
avoirdupois
pound (lb) newton (N) 4.448222
Pressure or Stress Conversion Factors
Pressure or stress
kip per square megapascal (MPa) 6.894757
inch (ksi)
pound per kilogram per 4.8824
square foot (psf) square meter (kg/sq m)
pound per square pascal (Pa) 47.88
foot (psf)
pound per square pascal (Pa) 6,894.757
inch (psi)
pound per square megapascal (MPa) 0.00689476
inch (psi)
Mass Conversion Factors
Mass (weight)
pound (lb) kilogram (kg) 0.4535924
avoirdupois
ton, 2000 lb kilogram (kg) 907.1848
grain kilogram (kg) 0.0000648
Mass (weight) per length
kip per linear kilogram per meter (kg/m) 0.001488
foot (klf)
pound per linear kilogram per meter (kg/m) 1.488
foot (plf)
Mass per volume (density)
pound per cubic kilogram per cubic 16.01846
foot (pcf) meter (kg/cu m)
pound per cubic kilogram per cubic 0.5933
yard (lb/cu yd) meter (kg/cu m)
Temperature Conversion Factors
Temperature
degree Fahrenheit (F) degree Celsius (C) tc=(tF-32)/1.8
degree Fahrenheit (F) kelvin (K) tk = (tF+459.7)/1.8
kelvin (K) degree Celsius (C) tc=tk-273.15
Energy and heat
British thermal joule (J) 1055.056
unit(Btu)
calorie (cal) joule (J) 4.1868E
Btu/degree F x hr x ft2 W/m2 - degree K 5.678263
kilowatt-hour (kwh) joule (J) 3,600,000E
British thermal calories per gram 0.55556
unit per pound (Btu/lb) (cal/g)
British thermal unit watt (W) 0.2930711
per hour (Btu/hr)
Power Conversion Factors
Power
horsepower (hp) watt (W) 745.6999 E
(550 ft-lb/sec)
Velocity
mile per hour (mph) kilometer per hour(km/hr) 1.60934
mile per hour (mph) meter per second (m/s) 0.44704
Permeability
darcy centimeter per 0.000968
second (cm/sec)
feet per day (ft/day) centimeter per 0.000352
second (cm/sec)
----------
*indicates that the factor given is exact.
**One U.S. gallon equals 0.8327 Canadian gallon.
t--A pascal equals 1.000 newton per square meter.
Note:
One U.S. gallon of water weighs 8.34 pounds (U.S.) at 60 degrees F.
One cubic foot of water weighs 62.4 pounds (U.S.).
One milliliter of water has a mass of 1 gram and has a volume of one cubic centimeter.
One U.S. bag of cement weighs 94 lbs.
More Useful Conversion Factors
USEFUL CONVERSION FACTORS
Quantity From English To Metric Multiply
Units Units by*
Length mile km 1.609347
yard m 0.9144**
foot m 0.3048**
inch mm 25.40**
Area square mile km 2 2.590
acre m 2 4047
acre hectare 0.4047
square yard m 2 0.8361
square foot m 2 0.092 90
square inch mm 2 645.2
Volume acre foot m 3 1 233
cubic yard m 3 0.7646
cubic foot m 3 0.028 32
cubic foot L (1000 cm 3) 28.32
100 board feet m 3 0.2360
gallon L (1000 cm 3) 3.785
Mass lb kg 0.4536
kip (1000 lb) metric ton (1000kg) 0.4536
Mass/unit length plf kg/m 1.488
Mass/unit area psf kg/m 2 4.882
Mass density pcf kg/m 3 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,
modules of
elasticity psf Pa 47.88
ksf kPa 47.88
psi kPa 6.895
ksi MPa 6.895
Bending moment, ft-lb N . m 1.356
torque, moment of force ft-kip kN . m 1.356
---------------------
* 4 significant digits
**denotes exact conversion
USEFUL CONVERSION FACTORS
Quantity From English Units To Metric Units Multiply by*
Moment of mass lb . ft kg . m 0.1383
Moment of inertia lb . ft2 kg . m 2 0.042 14
Second moment of area in4 mm4 416 200
Section modulus in3 mm3 16 390
Power ton (refrig) kW 3.517
Btu/s kW 1.054
hp (electric) W 745.7
Btu/h W 0.2931
Volume rate of flow ft 3/s m 3/s 0.028 32
cfm m 3/s 0.000 471 9
cfm L/s 0.4719
mgd m 3/s 0.0438
Velocity, speed ft/s m/s **0.3048
Acceleration f/s 2 m/s 2 0.3048
Momentum lb . ft/sec kg . m/s 0.1383
Angular momentum lb . ft 2/s kg . m 2/s 0.042 14
Plane Angle degree rad 0.017 45
mrad 17.45
---------------------------------
* 4 significant digits
**denotes exact conversion
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