TSP to mL Calculator

Converting teaspoons to milliliters is straightforward once you know the base value. One US teaspoon holds exactly 4.92892 mL. So to convert any number of teaspoons, you just multiply by that number.

For everyday kitchen use, most people round it to 5 mL per teaspoon. That's close enough for cooking and baking, and it's why a standard dose of liquid medicine is often listed as one teaspoon (5 mL) on the packaging. If precision matters, though, stick with the full 4.92892 figure.

The process is simple: take however many teaspoons you have, punch in the multiplication, and you've got your answer in milliliters. No special tools required.

The official conversion formula looks like this:

mL = teaspoons × 4.92892

So if you have 3 teaspoons and want to know the milliliter equivalent, the math is: 3 × 4.92892 = 14.79 mL.

For a rounded, quick-and-dirty version that works fine in most kitchen situations:

mL = teaspoons × 5

The difference between the exact and rounded versions is small. For 3 teaspoons, the exact result is 14.79 mL and the rounded result is 15 mL. That 0.21 mL gap won't ruin your soup, but it could matter in a pharmaceutical or scientific context where accuracy counts.

This chart covers the most common teaspoon amounts and their milliliter equivalents. Values are rounded to two decimal places.

Bookmark this chart if you find yourself converting these measurements often. It saves a lot of mental math.

Some teaspoon amounts come up over and over again in recipes and dosing guides. Here are the ones you'll probably use most:

• ½ teaspoon = 2.46 mL (rounded: 2.5 mL)
• 1 teaspoon = 4.93 mL (rounded: 5 mL)
• 1½ teaspoons = 7.39 mL (rounded: 7.5 mL)
• 2 teaspoons = 9.86 mL (rounded: 10 mL)
• 3 teaspoons = 14.79 mL (rounded: 15 mL) — also equal to 1 tablespoon
• 4 teaspoons = 19.72 mL (rounded: 20 mL)

The 3-teaspoon mark is especially useful to know because it equals 1 tablespoon. So 15 mL = 1 tablespoon = 3 teaspoons. That relationship makes scaling recipes up or down a lot easier.

Not all teaspoons are created equal. The US customary teaspoon and the metric teaspoon are close, but they're not identical.

The metric teaspoon is defined as exactly 5 mL, which is why a lot of nutrition labels and medicine instructions use that number. The US teaspoon is slightly smaller at just under 4.93 mL.

For most cooking purposes, the difference between US and metric teaspoons is negligible. Where it can matter is in large batches or in precise formulations. If a recipe comes from the UK and uses teaspoons, it might actually be calling for closer to 6 mL per spoon, so keep that in mind if something tastes off.

Going the other direction is just as easy. To convert milliliters back to teaspoons, divide by 4.92892 (or divide by 5 if you're using the rounded metric version).

teaspoons = mL ÷ 4.92892

A few quick examples:

• 5 mL ÷ 4.92892 = 1.01 tsp (basically 1 teaspoon)
• 10 mL ÷ 4.92892 = 2.03 tsp (about 2 teaspoons)
• 15 mL ÷ 4.92892 = 3.04 tsp (about 3 teaspoons, or 1 tablespoon)
• 30 mL ÷ 4.92892 = 6.09 tsp (about 6 teaspoons, or 2 tablespoons)

This comes in handy when a recipe gives liquid amounts in milliliters but you only have teaspoon measuring spoons on hand.

Teaspoons and milliliters are just one piece of the measurement puzzle in the kitchen. Here's how common volume units stack up against each other:

Knowing these relationships makes scaling recipes much simpler. If a recipe calls for 60 mL of vanilla extract (which would be a lot, but stay with the example), you know that's just over 12 teaspoons or about 4 tablespoons.

Baking is generally more sensitive to measurement accuracy than cooking. Liquids like vanilla, lemon juice, or oil are often listed in teaspoons or tablespoons in American recipes and in milliliters in European ones. Having a quick mental map of how these units relate saves a lot of back-and-forth with a calculator.

This conversion pops up in a surprisingly wide range of situations. Here are some of the most common:

• Medicine dosing: Over-the-counter liquid medications in the US often list doses as teaspoons, but oral syringes are marked in mL. Knowing that 1 tsp ≈ 5 mL helps you measure accurately.
• Cooking and baking: International recipes frequently use metric measurements. Converting teaspoons to milliliters (or vice versa) lets you follow any recipe without guessing.
• Baby and infant care: Pediatric dosing is almost always given in mL for precision. Parents often need to convert a teaspoon-based recommendation to a syringe measurement.
• Supplements and vitamins: Liquid supplements often come with a dropper or small cup marked in mL. If the recommended dose is listed in teaspoons, a quick conversion keeps things accurate.
• DIY beauty and cleaning products: Homemade recipes for things like sugar scrubs or cleaning sprays sometimes mix metric and US measurements. The TSP to mL conversion keeps your ratios right.
• Bartending and cocktails: Some cocktail recipes use dashes and teaspoons while others call for milliliters. Knowing the conversion helps you scale drinks for a crowd without throwing off the balance.

Once you have the 1 tsp = 4.93 mL (or roughly 5 mL) figure locked in, most of these situations become quick mental math rather than a trip to the search engine.