There are many handy conversion calculators on the Internet, but it is still useful to have a general idea of how large various units of measure are and how metric and English systems of measurement compare.
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LENGTH |
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Metric 1 kilometer (km) = 1,000 meters (103) 1 meter (m) = 100 centimeters 1 centimeter (cm) = 10 millimeters 1 millimeter (mm) = 0.000001 meters (10–6) 1 micrometer (μm) = 0.000000001 meters (10–9) 1 nanometer (nm) = 0.000000000001 meters (10–12) |
English 1 mile (mi) = 5,280 feet 1 yard (yd) = 36 inches (in) or 3 feet 1 foot (ft) = 12 inches |
Conversions 1 km = 0.621 mi 1 m = 39.4 in 1 cm = 0.394 in 1 mi = 1.609 km 1 yd = 0.914 m 1 in = 2.54 cm |
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MASS |
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Metric 1 metric ton (mt) = 1,000 kilograms 1 kilogram (kg) = 1,000 grams 1 gram (g) = 1,000 milligrams 1 milligram (mg) = 0.001 grams (10–3) |
English 1 U.S. ton (t) = 2,000 pounds 1 pound (lb) = 16 ounces (oz) |
Conversions 1 mt = 2,200 lb 1 kg = 2.2 lb 1 g = 0.035 oz 1 t = 0.907 mt 1 lb = 4.54 g or 0.454 kg 1 oz = 28.35 g |
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VOLUME |
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Metric 1 liter (L) = 1,000 milliliters 1 milliliter (ml) = 0.001 liters |
English 1 gallon (gal) = 4 quarts 1 quart (qt) = 2 pints or 4 cups 1 pint (pt) = 16 fluid oz |
Conversions 1 L = 0.265 gal or 1.06 qt 1 gal = 3.79 L |
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AREA |
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Metric 1 hectare (ha) = 10,000 square km |
English 1 acre (ac) = 4,840 square yards (yd) |
Conversions 1 ha = 2.47 ac 1 ac = 0.405 ha |
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CONCENTRATIONS |
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Metric 1 part per million (ppm) = 1 mg/L 1 part per billion (ppb) = 1 μg/L 1 part per trillion (ppt) = 1 ng/L |
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TEMPERATURE CONVERSIONS |
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Fahrenheit (°F) to Celsius (°C): °C = (°F – 32) × 5/9 Celsius (°C) to Fahrenheit (°F): °F = (°C – 5/9) + 32
In general: 1°C = 1.8°F 1°F = 0.56°C |
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