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 



millimeters 





2.54 



centimeters. 



square inches 



6.452 



square centimeters 



cubic inches 



16.39 



cubic centimeters 



feet 



30.48 



centimeters 





0.3048 



meters 



square feet 



0.0929 



square meters 



cubic feet 



0.0283 



cubic meters 



yards 



0.9144 



meters 



square yards 



0.836 



square meters 



cubic yards 



0.7646 



cubic meters 



miles 



1.6093 



kilometers 



square miles 



259.0 



hectares 



knots 



1.852 



kilometers per hour 



acres 



0.4047 



hectares 



foot-pounds 



1.3558 



newton meters 



millibars 



1.0197 x 10 -3 



kilograms per square centimeter 



ounces 



28.35 



grams 



pounds 



453.6 



grams 





0.4536 



kilograms 



ton, long 



1.0160 



metric tons 



ton, short 



0.9072 



metric tons 



degrees (angle) 



0.01745 



radians 



Fahrenheit degrees 



5/9 



Celsius degrees or Kelvins 1 



1 To obtain Celsius (C) temperature readings from Fahrenheit (F) readings, 

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



To obtain Kelvin (K) readings, use formula: K = (5/9) (F -32) + 273.15. 



