Teaspoons to Milliliters Converter

The converter above is already set to teaspoons and milliliters, so you only need to enter your number. The result updates as you type, and nothing is sent anywhere.

1. Type your value in the Value box, for example 1. Decimals and negative numbers are accepted.
2. Check that From shows teaspoons and To shows milliliters. Both menus can be changed if you need a different pair.
3. Read the answer in the large result box. The note under it shows the exact factor used for one teaspoon.
4. Press Copy result to put the answer on your clipboard, or Swap units to convert in the opposite direction.
5. Look at In every unit on the right to see the same amount in all the other volume units.

One teaspoon is about 4.92892 milliliters, so the formula is milliliters = teaspoons x 4.92892. Going the other way, one milliliter is about 0.202884 teaspoons. A US teaspoon is about 4.93 milliliters, usually rounded to 5 milliliters for medicine and cooking. A milliliter is one thousandth of a liter and equals one cubic centimeter.

Worked examples with the same factor:

• 1 teaspoon: 1 x 4.92892 = 4.92892 milliliters
• 3 teaspoons: 3 x 4.92892 = 14.7868 milliliters
• 10 teaspoons: 10 x 4.92892 = 49.2892 milliliters

A US teaspoon is about 5 ml, exactly 4.93 ml.

To check the converter by hand, take 3 teaspoons and apply the rule once: the result should be 14.7868 milliliters. If you go back again with the reverse factor 0.202884 you land on 3 teaspoons, which confirms that the two directions agree. Rounding the factor to fewer digits for mental math gives a result that is close but not identical, so use the tool when the last digits matter.

These reference values come from the same factor the converter uses, so they match what you see above. Use the table for common amounts, and the converter for anything else.

Volume units are the most confusing family because the same names mean different amounts in different countries. The US customary system and the British imperial system both use gallons, pints and fluid ounces, but they are not equal, and neither matches the metric cup used in many recipes. This converter uses US customary measures for gallons, cups, tablespoons, teaspoons and fluid ounces, and exact metric definitions for liters and milliliters.

Use the table as a sanity check rather than a substitute for the converter. A liter is a little more than a quart and a quarter of a US gallon, and a milliliter is a thousandth of a liter, so a result that is wildly different from those landmarks probably used the wrong unit. When a recipe matters, weigh the ingredient if the recipe gives a weight.

Medicine labels, spices and baking use teaspoons, while syringes and metric kitchen tools use milliliters.

Measuring spoons and cups vary by country: a metric cup is 250 ml, a US legal cup is 240 ml and a US customary cup is 236.6 ml. For baking by weight, a scale is more consistent than any volume conversion because flour and sugar pack differently.

Related pages: Volume Converter for the reverse direction, and the tablespoons to milliliters and milliliters to fluid ounces pages. For other volume units use the volume converter.

The page keeps no history, so each visit starts again from the defaults, 1 teaspoon. Your numbers are processed by JavaScript in your own browser and are never sent to a server, which makes the converter safe for private figures such as medical, financial or work measurements.