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) 3.785 411 784 liters 4 quarts, liquid point (typographical) 0.351 459 8 millimeters 0.013 837 inches pound, avdp 453.592 37 grams 16 ounces, avdp dram, troy 3.887 934 6 grams 0.125 ounces, troy ton, register 2.831 684 7 meters^3 100 feet^3 ton, short 907.184 74 kilograms 2,000 pounds, avdp. ton, metric 1,000 kilograms 2,204.623 pounds, avdp. ton, metric 1,000 kilograms 2,204.623 pounds,
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