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 
2.94 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 1.8532 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) 0.1745 radians 
Fahrenheit degrees 5/9 Celsius degrees or Kelvins! 
‘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. 
