CONVERSION FACTORS, NON-SI TO SI (METRIC) 

 UNITS OF MEASUREMENT 



Non-SI units of measurement used 

 (metric) units as follows: 



in this report can be converted to SI 



Multiply 



By 



To Obtain 



acres 



4,046.873 



square metres 



acre-feet 



1,233.489 



cubic metres 



cubic feet 



0.02831685 



cubic metres 



cubic feet per second per foot 



0.093 



cubic metres per 

 second per metre 



cubic yards 



0.7645549 



cubic metres 



Fahrenheit degrees 



5/9 



Celsius degrees or 

 kelvins* 



feet 



0.3048 



metres 



gallons (US liquid) 



3.785412 



cubic decimetres 



inches 



2.54 



centimetres 



pounds (force) per square foot 



47.88026 



pascals 



pounds (mass) 



0.4535924 



kilograms 



pounds (mass) per cubic foot 



16.01846 



kilograms per cubic 

 metre 



tons (2,000 pounds, mass) 



907.1847 



kilograms 



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

 use the following formula: C = (5/9) (F - 32). To obtain Kelvin (K) 

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



