Convert US teaspoons to Milliliters
1 US teaspoon is 4.93 ml. One US teaspoon is exactly 4.92892159375 milliliters.
One US teaspoon is 4.9289216 milliliters. To convert US teaspoons to milliliters, multiply by 4.9289216; to go the other way, divide by 4.9289216 or multiply by 0.20288414. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. One third of a tablespoon, about 4.93 ml.
Factor checked against the defining standard · How we check
- US teaspoons × 4.9289216
1 * 4.92892164.929 ml
1 US teaspoon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons (as entered) | 1 tsp | — |
| US tablespoons | 0.3333333333 tbsp | × 0.333333333333 |
| US fluid ounces | 0.1666666667 fl oz | × 0.166666666667 |
| US cups | 0.02083333333 cup | × 0.0208333333333 |
| US pints | 0.01041666667 pt | × 0.0104166666667 |
| US quarts | 0.005208333333 qt | × 0.00520833333333 |
| US gallons | 0.001302083333 gal | × 0.00130208333333 |
| milliliters | 4.928921594 ml | × 4.92892159375 |
| liters | 0.004928921594 L | × 0.00492892159375 |
| imperial gallons | 0.001084211178 gal (UK) | × 0.0010842111779 |
| imperial quarts | 0.004336844712 qt (UK) | × 0.00433684471161 |
| imperial pints | 0.008673689423 pt (UK) | × 0.00867368942322 |
| imperial fluid ounces | 0.1734737885 fl oz (UK) | × 0.173473788464 |
| imperial gills | 0.03469475769 gi (UK) | × 0.0346947576929 |
| cubic millimetres | 4,928.921594 mm³ | × 4,928.92159375 |
| cubic centimetres | 4.928921594 cm³ | × 4.92892159375 |
| cubic inches | 0.30078125 in³ | × 0.30078125 |
| cubic feet | 0.0001740632234 ft³ | × 0.00017406322338 |
| cubic yards | 0.000006446786051 yd³ | × 0.0000064467860511 |
| cubic metres | 0.000004928921594 m³ | × 0.00000492892159375 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: US teaspoons to millilitres is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change.
How do you convert US teaspoons to milliliters? The converter and the working
- 1.Take the measurement in US teaspoons.
- 2.Multiply by 4.9289216 — that is how many milliliters fit in one US teaspoon.
- 3.To go back the other way, divide by 4.9289216, or multiply by 0.20288414.
Worked example: 25 US teaspoons to milliliters
- Formula
- tsp × 4.9289216 = ml
- Arithmetic
- 25 × 4.9289216 = 123.22 ml
- Answer
- 25 tsp = 123.22 ml
The factor is rounded for display; the figure above is computed from the full value.
US teaspoons to milliliters conversion table
| US teaspoons | Milliliters |
|---|---|
| 1 tsp | 4.93 ml |
| 2 tsp | 9.86 ml |
| 3 tsp | 14.79 ml |
| 4 tsp | 19.72 ml |
| 5 tsp | 24.64 ml |
| 6 tsp | 29.57 ml |
| 7 tsp | 34.5 ml |
| 8 tsp | 39.43 ml |
| 9 tsp | 44.36 ml |
| 10 tsp | 49.29 ml |
| 12 tsp | 59.15 ml |
| 15 tsp | 73.93 ml |
| 20 tsp | 98.58 ml |
| 25 tsp | 123.22 ml |
| 50 tsp | 246.45 ml |
| 100 tsp | 492.89 ml |
| 200 tsp | 985.78 ml |
| 300 tsp | 1,478.68 ml |
| 500 tsp | 2,464.46 ml |
| 1000 tsp | 4,928.92 ml |
| 2000 tsp | 9,857.84 ml |
| 5000 tsp | 24,644.61 ml |
| 10000 tsp | 49,289.22 ml |
What is a US teaspoon?
One third of a tablespoon, about 4.93 ml. A metric teaspoon is a round 5 ml, which is why recipes rarely notice the difference.
What is a milliliter?
One thousandth of a liter, and exactly one cubic centimeter.
How many milliliters are in a US teaspoon?
One US teaspoon is 4.9289216 milliliters. Going the other way, one milliliter is 0.20288414 US teaspoons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US teaspoon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US teaspoons to milliliters. Rule Calculator. https://rulecalculators.com/convert/teaspoon-to-milliliter
- MLA
- "Convert US teaspoons to milliliters." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/teaspoon-to-milliliter.
- Chicago
- Rule Calculator. "Convert US teaspoons to milliliters." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/teaspoon-to-milliliter.
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Questions people actually ask
- How many milliliters are in a US teaspoon?
- 4.9289216. One thousandth of a liter, and exactly one cubic centimeter.
- How do I convert milliliters back to US teaspoons?
- Divide by 4.9289216, or multiply by 0.20288414 — they are the same operation.
Other volume conversions
Milliliters to US teaspoons — the same conversion the other way.