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 inchpound 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 inchpound
 
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
(µL) 
x
0.003 
fluid
ounce (fl. oz) 
Temperature 
°C, degrees Celsius, to °F, degrees Fahrenheit 9/5 x °C + 32 = °F 
To convert inchpound 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 (m^{2}) 
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.
 µg/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 µg/100 g) 
0.01 
1
milligram per kilogram (1 mg/kg) 
1 
1
microgram per gram (1 µg/g) 
1 
1
microgram per 100 milligrams (1 µg/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 µg/L) 
1 
