📏 US teaspoons to Milliliters Converter
Convert us teaspoons (tsp) to milliliters (mL) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 us teaspoon (tsp) = 4.9289216 milliliters (mL). Formula: mL = tsp × 4.9289216.
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US teaspoons to Milliliters Converter inputs
Result
US teaspoons to Milliliters conversion table
| US teaspoons (tsp) | Milliliters (mL) |
|---|---|
| 0.1 tsp | 0.49289216 mL |
| 0.5 tsp | 2.4644608 mL |
| 1 tsp | 4.9289216 mL |
| 2 tsp | 9.8578432 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 | 492.89216 mL |
| 1,000 tsp | 4,928.9216 mL |
Other volume conversions
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How to convert us teaspoons to milliliters
Multiply the number of us teaspoons by 4.9289216 to get milliliters: mL = tsp × 4.9289216.
Example: 5 tsp = 24.644608 mL.
The us teaspoon (tsp) and the milliliter (mL) are both units of volume. Need the opposite direction? Use the mL to tsp converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many milliliters are in a us teaspoon?
1 us teaspoon = 4.9289216 milliliters.
How do I convert us teaspoons to milliliters?
Use the formula mL = tsp × 4.9289216. For example, 5 tsp = 24.644608 mL.
How do I convert milliliters back to us teaspoons?
1 milliliter = 0.20288414 us teaspoons. Use the mL to tsp converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.