Ounces are used to measure both weight and volume. Converting ounces into a decimal figure involves just a bit of math and deciding in which unit of measure you want to express the new figure. Weight can be expressed any number of ways, but a good choice for conversion would be pounds, or grams if you're looking to convert to metric. Similarly, fluid ounces can be converted in portions of pints, quarts and gallons, or liters or milliliters if expressed with the metric system. Grab a calculator and go -- this won't take long.
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Divide ounces by 1/16 to get the decimal amount in pounds, since there are 16 oz. to the pound. For example, 3 oz. equals 3/16, or 0.1875 lb. You can get the same result by multiplying the number of ounces by 0.0625.
Multiply the number of ounces by 28.349, the number of grams in an ounce, to get the decimal equivalent in grams. For example, 3 oz. equals 85.047 g, or 0.085047 kilogram.
Calculate the number of fluid ounces in a gallon by multiplying by 0.007812. For example, 3 fluid oz. equals 0.023436 gallons. You can get the same result by dividing by 128, the number of fluid ounces in a gallon. Multiply your result by 4 to get a decimal amount for the ounces expressed in quarts.
Multiply fluid ounces by 29.5735, the number of fluid ounces in a milliliter (ml), to get milliliters. For example, 3 fluid oz. equals 88.7025 ml, or 0.0887025 liters.