Weights Sizes
- Weight Conversion - Area
- Length - Metal Weight Calculator (lbs)
- Nails - Thickness (gauges)
- Metal Weight Calculator (kg)  
Properties  
- Density - Luminance
- Energy - Power
- Flow - Pressure \ stress
- Velocity - Temperature
- Frequency - Torque
- Hardness - Force
- Volume - Illuminance
 
Area  
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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
Length  
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mile (US Statute) kilometer (km) 1.609347
inch (in) millimeter (mm) 25.4 *
inch (in) centimeter (cm) 25.4 *
inch (in) meter (m) 0.0254 *
foot (ft) meter (m) 0.3048 *
yard (yd) meter (m) 0.3048 *
Energy \ Power  
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horsepower (hp)
(550 ft-lb/sec)		 watt (W) 745.6999 E
Velocity  
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mile per hour (mph) kilometer per hour
(km/hr)		 1.60934
mile per hour (mph) meter per second (m/s) 0.44704
Permeability centimeter per
second (cm/sec)		 0.000968
darcy    
feet per day (ft/day) centimeter per
second (cm/sec)		 0.000352
Flow  
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Weight \ Mass  
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pound (lb) kilogram (kg) 0.4535924
ton, 2000 lb kilogram (kg) 907.1848
grain
Mass (weight) per length		 kilogram (kg) 0.0000648
kip per linear
foot (klf)		 kilogram per meter
(kg/m)		 0.001488
pound per linear
foot (plf)		 kilogram per meter
(kg/m)		 1.488
Mass per volume (density)    
Mass per volume (density)    
pound per cubic foot (pcf) kilogram per cubic meter (kg/cu m) 16.01846
Volume  
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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
Canada gallon (gal) liter 4.546
Canada gallon (gal) cubic meter (cu m) 0.004546
U.S. gallon (gal) liter 3.7854118
U.S. gallon (gal) cubic meter (cu m) 0.00378541
fluid ounce (fl oz) milliliters (ml) 29.57353
fluid ounce (fl oz) cubic meter (cu m) 0.00002957
Pressure \ Stress  
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kip per square inch (ksi) megapascal (MPa) 6.894757
pound per square foot (psf) kilogram per
square meter (kg/sq m)		 4.8824
pound per square foot (psf) pascal (Pa) 47.88
pound per square inch (psi) pascal (Pa) 6,894.757
pound per square inch (psi) megapascal (MPa) 0.00689476
Temperature  
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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 unit(Btu)		 joule (J) 1055.056
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
unit per pound (Btu/lb)		 calories per gram (cal/g) 0.55556
British thermal unit
per hour (Btu/hr)		 watt (W) 0.2930711
* 4 significant digits
** denotes exact conversion