Unit Converters

Teaspoons to Milliliters Converter

Type a value in teaspoons to get it in milliliters, and see the reverse conversion.

By TheCalcTools Updated October 17, 2026 Formula checked and tested

Your numbers

Value in teaspoons (tsp)

Your results

Converted value

Milliliters (mL)

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1 tsp in mL

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Your number read as mL, in tsp

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Tablespoons (tbsp)

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Teaspoons to Milliliters Converter by TheCalcTools

How the Teaspoons to Milliliters Converter works

A US teaspoon is 1/48 of a US cup, exactly 4.92892159375 mL. Medicine doses use the 5 mL metric teaspoon; use an oral syringe rather than a kitchen spoon for medicines.

To convert teaspoons to milliliters, multiply by 4.928921594. The calculator shows the result to 6 significant figures; the conversion factor itself is exact by definition.

Quick estimate in your head: multiply by 5 (a metric teaspoon is exactly 5 mL, used for medicine doses).

The formula

mL = tsp × 4.928921594tsp = mL ÷ 4.928921594

Worked example

Using the default values shown in the calculator:

Value in teaspoons (tsp)	1

1 tsp × 4.928921594 = 4.92892 mL.

Result:

Milliliters (mL)	4.92892
1 tsp in mL	4.92892
Your number read as mL, in tsp	0.202884
Tablespoons (tbsp)	0.333333

Conversion table

tsp	mL
0.25 tsp	1.23223 mL
0.5 tsp	2.46446 mL
1 tsp	4.92892 mL
1.5 tsp	7.39338 mL
2 tsp	9.85784 mL
3 tsp	14.7868 mL
4 tsp	19.7157 mL
5 tsp	24.6446 mL
6 tsp	29.5735 mL

Frequently asked questions

What is 1 teaspoon in milliliters?

1 teaspoon (tsp) equals 4.92892 mL.

Is a teaspoon 5 mL?

The metric (medical) teaspoon is exactly 5 mL; the US customary teaspoon is about 4.93 mL.

Sources and further reading

More in Unit Converters · All calculators

This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.