Appendix I— THE METRIC SYSTEM 



COMMON EQUIVALENTS AND CONVERSIONS 



Approximate Common Equivalents 



Conversions Accurate to Parts Per Million 



1 inch 



- 



25 millimeters 



inches x 25.4* 



= 



millimeters 



1 foot 



= 



0.3 meter 



feet x 0.3048* 



= 



meters 



lyard 



- 



0.9 meter 



yards x 0.9144* 



= 



meters 



1 mile 



= 



1.6 kilometers 



miles x 1.609 344 



= 



kilometers 



1 square inch 



= 



6.5 square centimeters 



square inches x 6.4516* 



= 



square centimeters 



1 square foot 



- 



0.09 square meter 



square feet x 0.092 903 



= 



square meters 



1 square yard 



- 



0.8 square meter 



square yards x 0.836 127 



= 



square meters 



lacre 



= 



0.4 hectare f 



acres x 0.404 686 



= 



hectares 



1 cubic inch 



- 



16 cubic centimeters 



cubic inches x 16.387 064 



= 



cubic centimeters 



1 cubic foot 



- 



0.03 cubic meter 



cubic feet x 0.028 317 



= 



cubic meters 



1 cubic yard 



= 



0.8 cubic meter 



cubic yards x 0.764 555 



= 



cubic meters 



1 quart (lq.) 



- 



1 liter t 



quarts (lq) x 0.946 353 



= 



liters 



1 gallon 



= 



0.004 cubic meter 



gallons x 0.003 785 



= 



cubic meters 



1 ounce (avdp) 



= 



28 grams 



ounces (avdp) x 28.349 523 



= 



grams 



1 pound (avdp) 



= 



0.45 kilogram 



pounds (avdp) x 0.453 592 



» 



kilograms 



1 horsepower 



= 



0.75 kilowatt 



horsepower x 0.745 7 



= 



kilowatts 



1 millimeter 



= 



0.04 inch 



millimeters x 0.039 37 



= 



inches 



1 meter 



- 



3.3 feet 



meters x 3.280 84 



= 



feet 



1 meter 



= 



1.1 yards 



meters x 1.093 613 



= 



yards 



1 kilometer 



= 



0.6 mile 



kilometers x 0.621 371 



= 



miles 



1 square centimeter 



= 



0.16 square inch 



square centimeters x 0.155 



■» 



square inches 



1 square meter 



= 



11 square feet 



square meters x 10.76391 



= 



square feet 



1 square meter 



- 



1.2 square yards 



square meters x 1.195 99 



= 



square yards 



1 hectare f 



i= 



2.5 acres 



hectares x 2.471054 



= 



acres 



1 cubic centimeter 



= 



0.06 cubic inch 



cubic centimeters x 0.061 024 



= 



cubic inches 



1 cubic meter 



= 



35 cubic feet 



cubic meters x 35.31467 



= 



cubic feet 



1 cubic meter 



= 



1.3 cubic yards 



cubic meters x 1.307 951 



= 



cubic yards 



1 liter f 



- 



1 quart (lq-) 



liters x 1.056 688 



- 



quarts (\q.) 



1 cubic meter 



- 



250 gallons 



cubic meters x 264.172 



= 



gallons 



1 gram 



= 



0.035 ounces (avdp) 



grams x 0.035 274 



= 



ounces (avdp) 



1 kilogram 



- 



2.2 pounds (avdp) 



kilograms x 2.204 623 



= 



pounds (avdp) 



1 kilowatt 



= 



1.3 horsepower 



kilowatts x 1.341 02 



= 



horsepower 



t common term not used in SI 



* exact 



423 



