Liquid Measure Conversions Chart
Converting Fluid Ounces to Milliliters (Cubic Centimeters)
As a nurse, you may be required to keep track of a patient’s fluid intake. Since
most products in the United States are sold by the fluid ounce, and nursing
documentation requires charting fluid intake by milliliters (mLs), also known as
cubic centimeters (CCs), you will need to convert liquid measures from fluid
ounces to their metric equivalents. The chart below gives you equivalents for
commonly used fluid measurements.
US liquid Measurements and Metric Fluid Measures
U.S. Liquid Metric
1 drop = .06 milliliter (ml)
15 drops = 1 milliliter (ml)
1 teaspoon (tsp) = 5 milliliters (ml)
1 tablespoon (Tbsp) = 15 milliliters (ml)
1 ounce (oz) = 30 milliliters (ml)
1 cup (c) = 240 milliliters (ml)
1 pint = 480 milliliters (ml)
1 quart = 960 milliliters (ml)
4 cups (c) = 960 milliliters (ml)
Sample conversions:
If you know the approximate number of ounces a patient has had, simply multiply
by 30 to get the number of mLs (CCs) a patient has taken in.
If a patient drinks an 8-ounce beverage (one cup) he has ingested 240 milliliters or
cubic centimeters.
If a patient has had 2/3 of a 20-ounce water bottle, she has had 2/3 x 20 ounces, or
about 13.3 ounces. One ounce is 30 milliliters, so multiply 13.3 times 30. The
patient has had 399, or about 400 ounces.
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