METRIC CONVERSION FACTORS 



ac = 4,047 m 2 = 0.404 7 ha 



ac-ft = 1,233.5 m 3 = 1.2335 dam 3 



C° = 1.8 F° 



cm = 0.3937 in. 



cm 2 = 0.155 in 2 



dam 3 = 1,000 m 3 = 0.8107 ac-ft 



ft 3 = 28.3171 x 10 -3 m 3 



ha = 10,000 m 2 = 2.471 ac 



hm = 100 m = 328.08 ft 



hm 3 = 1 x 10 6 m 3 



I.gpm = 0.0758 L/s 



in = 2.54 cm 



kg = 2.20462 lb = 1.1 x 10~ 3 tons 



km = 0.62137 miles 



km 2 = 0.3861 mi 2 



L = 0.3532 ft 3 = 0.21997 I. gal = 0.26420 U.S. gal 



L/s = 0.035 cfs = 13.193 I.gpm = 15.848 U.S. gpra 



m = 3.2808 ft 



m 2 = 10.7636 ft 2 



m 3 = 1,000 L = 35.3144 ft 3 = 219.97 I. gal = 264.2 U.S. gal 



m 3 /s = 35.314 cfs 



mm = 0.00328ft 



tonne = 1,000 kg - 1.1023 ton (short) 



U.S. gpm = 0.0631 L/s 



For Air Samples 



ppm ■ 100 pphm = 1000 X (Molecular Weight of substance/24.45) mg/m 3 



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