English to Metric

inches X 25.4 = millimeters
inches X 2.54 = centimeters
inches X 0.0254 = meters
feet X .3048 = meters
yards X 1093.6 = kilometers

sq. inches X 6.4516 = sq. centimeters
sq. feet X 0.0929 = sq. meters
sq. yards X 0.8361 = sq. meters

ounce X 28.3495 = grams
pounds X 453.5924 = grams
pounds X 0.4536 = kilograms
short tons X 907.2 = kilograms
short tons X 0.9072 = metric tons
long tons X 1016.1 = kilograms
long tons X 1.0160 = metric tons

Basis Weight = GSM X .614

Metric to English

millimeters X 0.0394 = inches
centimeters X 0.3937 = inches
meters X 1.0936 = yards
meters X 3.2808 = feet

sq. centimeters X 0.1550 = sq. inches
sq. meters X 10.7638
sq. meters X 1.1960 = sq. yards

grams X 0.0353 = ounces
grams X 0.0022 = pounds
kilograms = 35.3 ounces
kilograms X 2.2046 = pounds
metric tons X 2204.62 = pounds
metric tons X 1.1023 = short tons

GSM = Basis Weight
              0.614

NOTE:
metric ton = 2204.62 pounds (normally rounded to 2205 pounds or 1000 kilograms)
short ton = 2000 pounds
long ton = 2240 pounds