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 



square inches 

 cubic inches 



feet 



square feet 

 cubic feet 



yards 



square yards 

 cubic yards 



miles 



square miles 



knots 



acres 



foot-pounds 



millibars 



25.4 



2.54 



6.452 

 16.39 



30.48 

 0.3048 

 0.0929 

 0.0283 



0.9144 



0.836 



0.7646 



1.6093 

 259.0 



1.852 



0.4047 



1.3558 



1.0197 x 10 

 28.35 



-3 



pounds 





453.6 

 0.4536 



ton, long 





1.0160 



ton, short 





0.9072 



degrees (angle) 



0.01745 



Fahrenheit 



degrees 



5/9 



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 1 



*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. 



