EPA-Expo-Box Unit Conversion Table
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 in the table below.
| To Convert | Multiply | To Obtain |
|---|---|---|
| Volume | ||
| 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) |
| Mass | ||
| 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) |
| Area | ||
| square centimeters (cm2) | 0.0001 | square meters (m2) |
| square meters (m2) | 10,000 | square centimeters (cm2) |