What is Teaspoon to mL Converter?

This tool converts US teaspoons to milliliters, essential for precise baking and accurate medication dosing. Small measurements matter—especially for leavening agents, spices, and children's medicine where getting the right amount is critical.

The Conversion Factor

One US teaspoon equals exactly 4.92892 mL. This is universally rounded to 5 mL for practical purposes, which is how medicine cups and metric spoons are typically marked.

Teaspoon Relationships

3 teaspoons = 1 tablespoon
6 teaspoons = 1 fluid ounce
48 teaspoons = 1 cup
½ teaspoon = 2.5 mL
¼ teaspoon = 1.25 mL

Why This Matters

Baking: Too much baking soda can ruin a cake
Medicine: Accurate dosing ensures safety and effectiveness
Spices: Proper quantities create balanced flavors
Seasoning: Salt and pepper amounts affect taste significantly

Privacy

All conversions are calculated in your browser. No data is collected or stored.

How to Use

Converting teaspoons to milliliters is quick:

Enter the teaspoon amount from your recipe or dosage
View the mL equivalent displayed instantly
Use metric tools if more precise measurement is needed

Entering Fractions

For common baking fractions, use decimals:

¼ tsp = 0.25 = 1.23 mL
½ tsp = 0.5 = 2.46 mL
¾ tsp = 0.75 = 3.70 mL

Baking Examples

Baking soda: 1 tsp = 5 mL (don't exceed)
Vanilla extract: 2 tsp = 10 mL
Salt: ½ tsp = 2.5 mL
Yeast: 2¼ tsp = 11 mL (1 packet)

Medicine Dosing

The medical standard treats 1 teaspoon as exactly 5 mL. If your medicine is dosed in teaspoons, use a 5 mL oral syringe or medicine cup for accuracy. Kitchen teaspoons are not reliable for medication.

Features

Precision for Small Quantities

Uses the exact conversion of 4.92892 mL per teaspoon. Critical for baking where small variations in leavening can affect results.

Instant Calculation

Results appear as you type. Quickly check multiple values while cooking or baking.

Reference Table

Common teaspoon conversions:

½ tsp = 2.46 mL
1 tsp = 4.93 mL (≈ 5 mL)
2 tsp = 9.86 mL
3 tsp = 14.79 mL (= 1 tbsp)
4 tsp = 19.72 mL
5 tsp = 24.64 mL

Copy Function

Click to copy converted values for recipe documentation.

Unit Options

Use dropdown menus to switch between other volume units for additional conversions.

Frequently Asked Questions

How many mL is 1 teaspoon?

One US teaspoon equals 4.93 mL, which is universally rounded to 5 mL for practical use.

Is 5 mL the same as 1 teaspoon?

Yes, for practical purposes. The exact US teaspoon is 4.93 mL, but 5 mL is the standard rounding used in medicine and cooking. The 1.5% difference is negligible in most applications.

How many teaspoons are in 10 mL?

10 mL equals 2 teaspoons. This is a common medicine dose for children.

How do I measure ½ teaspoon in mL?

Half a teaspoon equals 2.5 mL. Many medicine syringes have 2.5 mL markings for this purpose.

Why is my kitchen teaspoon unreliable?

Eating teaspoons vary from 3 mL to 8 mL depending on their design. Only standardized measuring spoons consistently hold 5 mL. For medicine, always use the dosing device provided.

How do I measure ¼ teaspoon accurately?

A quarter teaspoon equals 1.25 mL. For this small amount, use a proper ¼ teaspoon measuring spoon. Trying to estimate with a regular spoon leads to significant errors.

Teaspoon to mL