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Length Equivalents
cm Inches Feet Yards Metres Chains Kilometre Miles
1 0.397 0.03281 0.01094 0.01 0.0004971 E-05 6.214E-06
2.540 1 0.8333 0.2778 0.0254 0.001263 2.54E-05 1.578E-05
30.48 12 1 0.3333 0.3048 0.01515 3.048E-04 1.894E-09
91.44 36 3 1 0.9144 0.04545 9.144E-04 5.682E-04
100 39.37 3.281 1.0936 1 0.04971 0.001 6.214E-04
2012 792 66 22 20.12 1 0.02012 0.0125
100 000 39 370 3281 1093.6 1000 49.7 1 0.6214
160 934 63 360 5280 1760 1609 80 1.609 1
 

Mass Equivalents
Kilograms Grains Ounces Pounds Short Tons Long Tons Metric Tons
1 15432 35.27 2.205 0.001 102 0.000 9842 0.001
0.000 06480 1 0.002 286 0.000 1429 7.143E-08 6.378E-08 6.480E-08
0.031 10 480 1.097 14 0.068 57 3.429E-05 3.061E-05 3.110E-05
0.02835 437.5 1 0.0625 3.125E-05 2.790E-05 2.835E-05
0.3732 5760 13.17 0.8229 0.000 4114 0.000 3673 0.0003732
0.4536 7000 16 1 0.0005 0.000 4464 0.000 4536
907.2 14 000 000 32 000 2000 1 0.8929 0.9072
1016 15 680 000 35 840 2240 1.12 1 1.016
1000 15 432 356 35 274 2205 1.102 0.9842 1
   

Useful Conversion Factors
Length
1 foot = 0.3048 m
1 yard = 0.9144 m
1 fathom = 1.829 m ( 1 fathom = 6 feet )
1 furlong = 0.2012 km ( 1 furlong = 220 yards )
1 mile = 1.609 km
1 nautical mile = 1.852 km (1 nautical mile=1.15 mile)
    
Area
1 sq.in. = 645.2 mm2
1 sq.ft. = 929.0 cm2
1 sq.yard = 0.8361 m2
1 acre = 4047 m2 (1 acre = 4840 sq.yard)
1 sq.mile = 2.590 km2
   
Volume
1 cubic inch = 16.39cm3
1 fluid ounce = 28.41 cm3
1 pint = 568.3 cm3
1 Imperial gallon = 4.546 litre
1 U.S. gallon = 3.785 litre
1 cubic foot = 28.32 litre (1 cu.ft. = 6.24 Imp.gallons)
1 cubic yard = 0.7646 m3
     
Speed
1 revolution/minute = 0.1047 rad/s
1 mile/hour = 0.4470 m/s
1 knot = 0.5148 m/s = 1 nautical mile/h
   
Mass
1 ounce = 28.35 g
1 pound (lb) = 0.4536 kg
1 slug = 14.59 kg = 32.17 lb
1 hundredweight (cwt) = 50.8 kg = 112 lb
1 ton = 1.016 t = 2240 lb
 
Density
1 lb/in3 = 27.68 g/cm3
1 lb/ft3 = 16.02 kg/m3
1 lb/gallon = 99.78 kg/m3
1 ton/yd3 = 1.329 t/m3
   
Moments of mass
1 lb ft = 0.1383 kg m
1 lb ft2 = 421.4 kg cm2
  
Force
1 lb force (lbf) = 4.448 N (standard gravity)
1 ponundal (pdl) = 421.4 kg cm2
1 ton force = 9.964 kN
    
Pressure (or stress)
1 lb/ft2 = 47.88 N/m2
1 lb/in2 (psi) = 6.895 kN/m2 (kPa)
1 ton/ft2 = 107.3 kN/m2
1 ton/in2 = 15.44 N/mm2
1 in Hg (0 deg C) = 3.386 kN/m2 (kPa) = 0.491 psi
1 ft H2O (4 deg C) = 2.989 kN/m2 = 0.434 psi
1 atmosphere (atm) = 1.013 bar
   
Energy, etc.
1 ft lbf = 1.356 J
1 ft pdl = 42.14 mJ
1 horse power = 745.7 W = 550 ft lbf/s
1 electron volt (eV) = 1.602 E-19 J
1 degree Fahrenheit = 5/9 K
* 1 calorie = 4.187 J
* 1 Btu = 1.055 kJ = 252 cal
1 Chu = 1.899 kJ = 9/5 Btu
1 therm = 105.5 MJ = E-05 Btu
1 Btu/hour = 0.293 W
1 Btu/lb = 2.325 kJ/kg
* The calorie and Btu were defined in terms of heating water, and their precise values depended on the temperature limits specified. The figures given are based on agreed international equivalents.