E 0^18 10^36 10^54
peta P 10^15 10^30 10^45
tera T 10^12 10^24 10^36
giga G 10^9 10^18 10^27
mega 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
Units 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 kilometers^2 0.001 562 miles^2,statute
are 100 meters^2 119.599 yards^2
barrel
(petroleum, US) 158.987 29 liters 42 gallons
(proof spirits, US) 151.416 47 liters 40 gallons
(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 degrees C, freezes at 0 degrees C)
multiply by 1.8 and add 32 to obtain degrees F
degrees, fahrenheit
subtract 32 and divide by 1.8 to obtain degrees C
(water boils at 212