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 0.5 quarts, dry pint, liquid (US) 3.696 69 milliliters 0.125 ounces, troy quart, dry (US) 1.101 221 liters 2 pints, dry quart, liquid (US) 3.785 411 784 liters 4 quarts, liquid point (typographical) 0.351 459 8 millimeters 0.013 837 inches pound, avdp 453.592 37 grams 16 ounces, avdp pound, troy 373.241 721 6 grams 0.125 ounces, liquid (US) 3.696 69 milliliters 0.125 ounces, troy dram, liquid (US) 0.473 176 473 liters 0.5 quarts, dry pennyweight 1.555 173 84 grams 24 grains pint, dry (US) 1.101 221 liters 2 pints, dry quart, liquid (US) 3.785 411 784 liters 4
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