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# Conversion Factors

1. Area

1 square centimeter (1 cm2) = 0.1550 square inches

1 square meter (1 m2) = 1.1960 square yards

1 hectare = 2.4711 acres

1 square kilometer (1 km2) = 0.3861 square miles

1 square inch (1 in.2) = 6.4516 square centimeters

1 square foot (1 ft2) = 0.0929 square meters

1 square yard (1 yd2) = 0.8361 square meters

1 acre = 4046.9 square meters

1 square mile (1 mi2) = 2.59 square kilometers

2. Concentration Conversions

1 part per million (1 ppm) = 1 microgram per liter (1 μg/L)

1 microgram per liter (1 μg/L) = 1 milligram per kilogram (1 mg/kg)

1 microgram per liter (μg/L) × 6.243 × 108 = 1 lb per cubic foot (1 lb/ft3)

1 microgram per liter (1 μg/L) × 10− 3 = 1 milligram per liter (1 mg/L)

1 milligram per liter (1 mg/L) × 6.243 × 10 ...

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