Fluid ounces (oz) as used in the imperial measurement system in the United States is used to tell the volume of substances. Volume parameters in the metric system are measured using liters.
1 oz is equivalent to 0.02957352965 liter. Therefore, 1 liter has (1/0.02957352965) oz, which is 33.814 oz. Conversion from oz to liters is necessary as may apply based on the measurement system required.