cm
m
inch
feet (12in, 1/3yd)
: ft : in
km
miles
cm2
m2
inch2
feet2
cm3
m3
inch3
feet3
g
oz
lb (16oz)
: lb : oz
cup sugar
cup flour
Liter
quart
fl oz
gal (4qt, 8pt)
Celcius
Fahrenheit

round to 10 digits

Wikipedia: United States customary units