CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) UNITS OF MEASUREMENT 



U.S. customary units of measurement used in this report can be converted to 

 metric (SI) units as follows: 



Multiply 



by 



To obtain 



inches 



25.4 





2.54 



square inches 



6.452 



cubic inches 



16.39 



feet 



30.48 





0.3048 



square feet 



0.0929 



cubic feet 



0.0283 



yards 



0.9144 



square yards 



0.836 



cubic yards 



0.7646 



miles 



1.6093 



square miles 



259.0 



knots 



1.852 



acres 



0.4047 



foot-pounds 



1.3558 



millibars 



1.0197 X 10" 



ounces 



28.35 



pounds 



453.6 





0.4536 



ton, long 



1.0160 



ton, short 



0.9072 



degrees (angle) 



0.01745 



Fahrenheit degrees 



5/9 



-3 



millimeters 

 centimeters 



square centimeters 



cubic centimeters 



centimeters 

 meters 



square meters 



cubic meters 



meters 



square meters 

 cubic meters 



kilometers 

 hectares 



kilometers per hour 



hectares 



newton meters 



kilograms per square centimeter 



grams 



grams 

 kilograms 



metric tons 



metric tons 



radians 



Celsius degrees or Kelvins^ 



^To obtain Celsius (C) temperature readings 

 use formula: C = (5/9) (F -32). 



To obtain Kelvin (K) readings, use formula; 



from Fahrenheit (F) readings, 

 K = (5/9) (F -32) + 273.15. 



