US Teaspoons to Milliliters
Convert us teaspoons to milliliters instantly. 1 tsp = 4.9289215938 mL. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us teaspoons to milliliters
To convert us teaspoons to milliliters, multiply by 4.9289215938. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
mL = tsp × 4.9289215938
US Teaspoons to Milliliters conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Teaspoons | Milliliters |
|---|---|
| 1 tsp | 4.928922 mL |
| 2 tsp | 9.857843 mL |
| 3 tsp | 14.786765 mL |
| 5 tsp | 24.644608 mL |
| 10 tsp | 49.289216 mL |
| 20 tsp | 98.578432 mL |
| 25 tsp | 123.22304 mL |
| 50 tsp | 246.44608 mL |
| 100 tsp | 492.892159 mL |
| 500 tsp | 2,464.46 mL |
| 1,000 tsp | 4,928.92 mL |
What is a us teaspoon?
About 4.93 mL. The smallest standard US kitchen measure.
What is a milliliter?
A thousandth of a litre, equal to one cubic centimetre.
The formula
mL = tsp × 4.9289215938
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the US Teaspoons to Milliliters
- Type the number of us teaspoons you want to convert.
- Read the result in milliliters straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked milliliters to us teaspoons page.
US Teaspoons to Milliliters — frequently asked questions
How many milliliters are in a us teaspoon?
One us teaspoon equals 4.9289215938 mL. mL = tsp × 4.9289215938
What is the formula to convert us teaspoons to milliliters?
The formula is mL = tsp × 4.9289215938. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert milliliters back to us teaspoons?
Divide instead of multiplying: one milliliter is 0.2028841362 tsp. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this us teaspoons to milliliters free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error