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EPA-Expo-Box (A Toolbox for Exposure Assessors)


Units Conversions

Frequently, exposure assessments require the use of volume, mass or area conversion factors. Conversion factors may be used to convert these units of measure to those needed to calculate dose. These factors are used, for example, to ensure consistency between the units used to express exposure concentration and those used to express intake. A list of common conversion factors is provided below.

To Convert Multiply To Obtain
cubic centimeters (cm3) 0.000001 cubic meters (m3)
cubic centimeters (cm3) 0.001 liters (L)
cubic meters (m3) 1,000,000 cubic centimeters (cm3)
gallons (gal) 3.785 liters (L)
liters (L) 0.264 gallons (gal)
liters (L) (water) 1,000 grams (g) (water)
liters (L) 1,000 milliliters (mL)
liters (L) 1,000 cubic centimeters (cm3)
milliliters (mL) 0.001 liters (L)
milliliters (mL) (water) 1 grams (g) (water)
grams (g) 0.0022 pound (lb)
grams (g) (water) 1 milliliters (mL) (water)
grams (g) (water) 0.001 liters (L) (water)
grams (g) 1,000 milligrams (mg)
grams (g) 0.001 kilograms (Kg)
kilograms (Kg) 1,000 grams (g)
micrograms (µg) 0.001 milligrams (mg)
milligrams (mg) 0.001 grams (g)
milligrams (mg) 1,000 micrograms (µg)
pounds (lb) 454 grams (g)
square centimeters (cm2) 0.0001 square meters (m2)
square meters (m2) 10,000 square centimeters (cm2)


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