M 10^6 10^12 10^18
hectokilo hk 10^5 10^10 10^15
myria ma 10^4 10^8 10^12
kilo k 10^3 10^6 10^9
hecto h 10^2 10^4 10^6
basic unit - 1 meter, 1 meter^2 1 meter^3
1 gram,
1 liter
deci d 10^-1 10^-2 10^-3
centi c 10^-2 10^-4 10^-6
milli m 10^-3 10^-6 10^-9
decimilli dm 10^-4 10^-8 10^-12
centimilli cm 10^-5 10^-10 10^-15
micro u 10^-6 10^-12 10^-18
nano n 10^-9 10^-18 10^-27
pico p 10^-12 10^-24 10^-36
femto f 10^-15 10^-30 10^-45
atto a 10^-18 10^-36 10^-54

Equivalents

Unit Metric Equivalent US Equivalent
acre 0.404 685 64 hectares 43,560 feet^2
acre 4,046,856 4 meters^2 4,840 yards^2
acre 0.004 046 856 4 0.001 562 5 miles^2,
kilometers^2 statute
are 100 meters^2 119.599 yards^2
barrel (petroleum, US) 158.987 29 liters 42 gallons
barrel (proof spirits, 151.416 47 liters 40 gallons
US)
barrel (beer, US) 117.347 77 liters 31 gallons
bushel 35.239 07 liters 4 pecks
cable 219.456 meters 120 fathoms
chain (surveyor's) 20.116 8 meters 66 feet
cord (wood) 3.624 556 meters^3 128 feet^3
cup 0.236 588 2 liters 8 ounces, liquid (US)
degrees, celsius (water boils at 100. multiply by 1.8 and add
degrees C, freezes at 0. C) 32 to obtain .F
degrees, fahrenheit subtract 32 and divide by (water boils at 212 .F,
1.8 to obtain .C freezes at 32 .F)
dram, avoirdupois 1.771 845 2 grams 0.062 5 ounces, avoirdupois
dram, troy 3.887 934 6 grams 0.125 ounces, troy
dram, liquid (US) 3.696 69 milliliters 0.125 ounces, liquid
fathom 1.828 8 meters 6 feet
foot 30.48 centimeters
foot