Units Conversion From Imperial/US customary units to SI/Metric units

 fps unit SI unit Length 1 inch (in) 2.54 x 10-2 m 1 foot (ft) 0.3048 m 1 yard (yd) 0.9144 m 1 fathom 1.8288 m 1 chain 20.1168 m 1 furlong 2.01168m x 102 m 1 mile (mi) 1.609344 x 103 m Area 1 square inch (in2) 6.45 x 10-4 m2 1 square feet (ft2) 9.29 x 10-2 m2 1 square yard (yd2) 0.836 m2 1 square mile (mi2) 2.5899 x 106 m2 1 acre 4.0468 x 103 m2 Mass 1 ounce (oz) 2.83 x 10-2 kg 1 pound (lb) 0.45 kg 1 stone 6.35 kg 1 quarter 12.7 kg 1 hundred weight (cwt) 50.8 kg 1 ton 1.016 x 103 kg Volume 1 cubic inch (in3) 1.69 x 10-5 m3 1 cubic feet (ft3) 2.83 x 10-2 m3 1 cubic yard (yd3) 0.764 m3 1 fluid ounce (fl oz) 2.84 x 10-5 m3 1 pint (pt) 5.68 x 10-4 m3 1 quart (qt) 1.136 x 10-3 m3 1 gallon (gal) 4.546 x 10-3 m3 1 bushel (bu) 0.036 m3 1 gallon USA (=231 in3) 3.78 x 10-3 m3 Note: 1cm3 = 1 ml and 1m3 =1000 Litre Speed 1 inch per second (in s-1) 2.54 x 10-2 m s-1 1 feet per second (ft s-1) 0.305 m s-1 1 mile per hour (mi h-1) 0.447 m s-1 Force 1 poundal (pdl) 0.14 N 1 pound force (lbf) (the weight of 1 pound(lb) mass) 4.45 N Pressure 1 pound force per square inch 1 lbf in-2 (p.s.i) 6.8947 x 103Pa Density 1 pound per cubic feet (1 lb ft -3) 16.018 kg m -3 Energy 1 foot poundal (ft pdl) 4.21 x 10-2 J 1 foot pound force (ft lbf) 1.355 J 1 british thermal unit (Btu) 1.055 x 103 J 1 thermal (therm) 1.055 x 108 J Power 1 horse power (hp) 7.457 x 102 W standard atmosphere 14.695 lbf in-2 = 1.013 x 105 Pa standard acceleration of gravity 32.174 ft s-1 = 9.806 m s-2

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