But that difference becomes much more noticeable when you consider a gallon of milk, which in the US is 3,785 ml versus 4,546 ml in Britain. The difference in a teaspoon of vanilla would be hard to measure even if you tried. For example, a US contemporary teaspoon is 4.93 ml compared to 5 ml in the Britisth Imperial System teaspoon. These differences are small when the amounts are small, but can really add up for larger volumes.

Even within the US, there are differences between the US contemporary system and that used by the US Food and Drug Administration. To add to the confusion, these systems all use the same names, such as pints and quarts, to mean slightly different measurement amounts. Some English-speaking countries, including the United States, United Kingdom, and Australia, use measurement systems that originated from an old system called “English units”. Doing so will give you your desired results: 250 milliliters multiplied by 0.0042267528198649 equals 1. Most countries use the metric system (officially known as the International System of Units), where every unit is defined using a measurable phenomenon, such as the distance light travels in a second. Or, to find out the equivalent of 250 milliliters in cups, multiply it by 0.0042267528198649, which is the conversion factor for this calculation. For other substances, the density will be different, and each teaspoon will weigh a different number of grams. Water has a density of 1 g/ml, so the conversion is 1 gram to 1 millileter, which is equivalent to 0.2 teaspoons. The correct conversion depends on the density of the item you're measuring. Grams are a measure of mass, and teaspoons measure volume. To convert 2 cups into milliliters we have to multiply 2 by the conversion factor in order to get the volume amount from cups to milliliters. If you're looking for a grams-to-teaspoons conversion chart, you won't find one here. The conversion factor from cups to milliliters is 236.5882375, which means that 1 cup is equal to 236.5882375 milliliters: 1 cup 236.5882375 ml.

Cups to ml