US teaspoons to Millilitres
Type a value in US teaspoons and get the result in Millilitres, calculated exactly.
1 US teaspoons = 4.92892159375 Millilitres
Precision
Exact factorThis result is exact.
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Formula
mL = tsp (US) × 4.92892159375
To convert US teaspoons to Millilitres, multiply the value by 4.92892159375.
Worked examples
- 1 tsp (US) × 4.92892159375 = 4.92892159375 mL
- 100 tsp (US) × 4.92892159375 = 492.892159375 mL
- 50 tsp (US) × 4.92892159375 = 246.4460796875 mL
This factor is exact by definition.
Conversion table
| US teaspoons (tsp (US)) | Millilitres (mL) |
|---|---|
| 0.25 | ≈ 1.23223 |
| 0.5 | 2.464460796875 |
| 0.75 | ≈ 3.696691 |
| 1 | 4.92892159375 |
| 1.5 | 7.393382390625 |
| 2 | 9.8578431875 |
| 2.5 | 12.322303984375 |
| 3 | 14.78676478125 |
| 4 | 19.715686375 |
| 5 | 24.64460796875 |
| 6 | 29.5735295625 |
| 8 | 39.43137275 |
| 10 | 49.2892159375 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Millilitres to US teaspoons
| Millilitres (mL) | US teaspoons (tsp (US)) |
|---|---|
| 0.25 | ≈ 0.05072103 |
| 0.5 | ≈ 0.1014421 |
| 0.75 | ≈ 0.1521631 |
| 1 | ≈ 0.2028841 |
| 1.5 | ≈ 0.3043262 |
| 2 | ≈ 0.4057683 |
| 2.5 | ≈ 0.5072103 |
| 3 | ≈ 0.6086524 |
| 4 | ≈ 0.8115365 |
| 5 | ≈ 1.014421 |
| 6 | ≈ 1.217305 |
| 8 | ≈ 1.623073 |
| 10 | ≈ 2.028841 |
Unit definitions
- US teaspoons tsp (US)
- One third of a US tablespoon: exactly 4.92892159375 mL.
- Millilitres mL
- One thousandth of a litre.
Questions people ask
US teaspoons to Millilitres: what is the conversion factor?
One tsp (US) is 4.92892159375 mL.
How do I convert US teaspoons to Millilitres?
Use the formula above. For example, 100 tsp (US) = 492.892159375 mL.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.