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Appendix H

Conversion table

The units of measurement that are used by laboratories for recording the results of scientific or diagnostic tests are reported in this Manual in the metric or SI units (from the French "Le System International d’Unites") that are customary for those results. Other units of measurement, such as those that are used in the field for reporting area or length, are reported in the inch-pound units that are common in the United States. The lists of conversion factors and abbreviations below are for those who are interested in converting the basic units of measurement that are used in this Manual to the system of choice. For temperature, use the equations provided.

To convert SI to inch-pound

-- Multiply by to obtain
Length millimeters (mm) x  0.039 inch (in.)
centimeters (cm) x  0.39 inch (in.)
meter (m) x  3.28 foot (ft)
meter (m) x  1.09 yard yard (yd)
kilometer (km) x  0.62 mile (mi)
Weight kilogram (kg) x  2.21 pound (lb)
metric ton x  1.10 short ton
Volume or capacity milliliters (mL) x  0.03 fluid ounce (fl. oz)
microliters (L) x  0.003 fluid ounce (fl. oz)
Temperature C, degrees Celsius, to F, degrees Fahrenheit 9/5 x C + 32 = F

To convert inch-pound to SI

-- Multiply by to obtain
Length inch (in.) x  25.4 millimeters (mm)
foot (ft) x  2.54 centimeters (cm)
mile (mi) x  0.3048 kilometer (km)
Area acre  x  4,047 square meters (m2)
Weight pound (lb) x  0.4356 kilogram (kg)
short ton x  0.907 metric ton
Temperature F, degrees Fahrenheit, to C, degrees Celsius
(F - 32) X 5/9 = C

Other abbreviated units of measurement used in this Manual:

  • cc = cubic centimeter, a unit of measurement that indicates the dosage of a drug or substance that is administered intravenously or by injection.
  • g/g = micrograms per gram
  • mg/kg = milligrams per kilogram

Conversion table for units of measurement that are frequently used with the toxicology of pesticides:

Concentration of compound in tissue, food, or water, in SI units Concentration of compound in tissue, food, or water, in parts per million (ppm)
1 nanogram per gram (1 ng/g) 0.001
1 microgram per 100 grams (1 g/100 g) 0.01
1 milligram per kilogram (1 mg/kg) 1
1 microgram per gram (1 g/g) 1
1 microgram per 100 milligrams (1 g/100 mg) 10
1 milligram per 100 grams (1 mg/100 g) 10
1 milligram per gram (1 mg/g) 1,000
Concentration of compound in air, in SI units Concentration of compound in air, in parts per million (ppm)
1 microgram per liter (1 g/L) 1

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