Teaspoon to mL Converter

Converting teaspoons to milliliters is a fundamental kitchen measurement skill, necessary for accurately following recipes from different countries and for working with metric ingredients. The teaspoon is one of the smallest standard cooking measures, typically used for spices, extracts, baking powder, and other ingredients where small quantities have significant effects. The conversion depends on which teaspoon standard you use: a US teaspoon is 4.929 mL, a metric teaspoon is exactly 5 mL, and a UK teaspoon is 5.919 mL.

Milliliters provide a universal, unambiguous measure that transcends regional differences in spoon sizing. When a recipe specifies "1 teaspoon of vanilla extract," converting to milliliters ensures precision regardless of which country's teaspoon standard your measuring spoons follow. This is particularly important in professional kitchens, food manufacturing, and pharmaceutical compounding where consistency is paramount.

The teaspoon-to-milliliter relationship is used countless times in daily cooking. A typical recipe might call for half a teaspoon of salt, one teaspoon of baking soda, or two teaspoons of curry powder. Having an intuitive sense of these conversions — that half a US teaspoon is roughly 2.5 mL, for example — makes cooking more fluid and reduces reliance on measuring tools for experienced cooks.

This calculator supports the three major teaspoon standards and simultaneously shows the equivalent volume in tablespoons, cups, fluid ounces, and liters, providing a complete picture for any kitchen measurement scenario.

The core conversion is multiplication: multiply the number of teaspoons by the mL-per-teaspoon factor for your chosen standard. For US teaspoons, use 4.929 mL; for metric, use exactly 5 mL; for UK teaspoons, use 5.919 mL.

From the milliliter value, other conversions follow naturally: divide by 236.588 for US cups, divide by 29.5735 for US fluid ounces, divide by 1000 for liters, and use the fixed relationships between teaspoons and tablespoons (3 tsp = 1 US tbsp) for cooking unit conversions.

Just as with tablespoons, teaspoon sizes vary internationally. The US teaspoon (4.929 mL) is defined as exactly 1/3 of a US tablespoon (14.787 mL ÷ 3 = 4.929 mL). The metric teaspoon (5 mL) is a convenient round-number standard used in many countries and commonly found on measuring spoons sold internationally.

The UK teaspoon (5.919 mL) is derived from the imperial system, equal to exactly 1/3 of a UK tablespoon (17.758 mL). This is significantly larger than both the US and metric teaspoons — a UK teaspoon holds about 20% more than a metric teaspoon and about 20% more than a US teaspoon.

These differences are less consequential for casual cooking but can accumulate in recipes that call for multiple teaspoons of an ingredient. A recipe requiring 6 teaspoons of an ingredient would yield noticeably different results depending on whether US (29.57 mL), metric (30 mL), or UK (35.51 mL) teaspoons were used.

Converting teaspoons to milliliters is effortless with this tool:

1. Enter the Teaspoon Amount: Type the number of teaspoons into the input field, using decimals for fractional amounts (e.g., 0.5 for half a teaspoon).
2. Select the Teaspoon Type: Choose from US, metric, or UK teaspoon standards using the dropdown. The default is US teaspoons.
3. Read the Milliliter Result: The primary display shows the volume in milliliters.
4. Review Additional Conversions: The "All Conversions" section shows the equivalent in tablespoons, cups, and fluid ounces.
5. Compare Teaspoon Types: The "Teaspoon Types" panel shows the mL equivalent for each standard side by side.

Teaspoon-to-milliliter conversion is critical in baking, where leavening agents like baking soda and baking powder are measured in small but precisely calibrated amounts. Too much baking soda can produce a soapy taste and excessive browning; too little can result in a dense, flat product. Converting to milliliters ensures consistent results across different measuring equipment.

In pharmaceutical dosing, liquid medications are sometimes prescribed in teaspoon doses, particularly for pediatric formulations. The American Academy of Pediatrics recommends that parents use a proper oral syringe or measuring device calibrated in milliliters rather than relying on household teaspoons, which vary in size. Converting the prescribed teaspoon dose to milliliters is essential for accurate medication administration.

Nutritional tracking often requires precise measurement of calorie-dense ingredients like oils, nut butters, and sauces. Knowing that 1 teaspoon of olive oil is approximately 4.93 mL (and roughly 4.5 grams) allows accurate calorie and macronutrient calculation.

In craft beverages and mixology, bitters, syrups, and concentrated flavorings are measured in dashes or teaspoons, and precise milliliter equivalents are important for consistent product development and scaling.