Convert Teaspoon (US) to millilitres
Americas · Cooking Measures · active · modern
Conventional value The unit is customary but its modern value is settled and widely cited; the arithmetic itself is exact.
1 Teaspoon (US) = 4.92892 millilitres
millilitres = Teaspoon (US) × 4.92892
Convert any amount
Teaspoon (US) to millilitres table
| Teaspoon (US) | millilitres |
|---|---|
| 0.25 Teaspoon (US) | 1.23223 millilitres |
| 0.5 Teaspoon (US) | 2.46446 millilitres |
| 1 Teaspoon (US) | 4.92892 millilitres |
| 2 Teaspoon (US) | 9.85784 millilitres |
| 3 Teaspoon (US) | 14.7868 millilitres |
| 4 Teaspoon (US) | 19.7157 millilitres |
| 5 Teaspoon (US) | 24.6446 millilitres |
| 10 Teaspoon (US) | 49.2892 millilitres |
| 20 Teaspoon (US) | 98.5784 millilitres |
| 25 Teaspoon (US) | 123.223 millilitres |
| 50 Teaspoon (US) | 246.446 millilitres |
| 100 Teaspoon (US) | 492.892 millilitres |
About the Teaspoon (US)
US teaspoon = 4.93ml.
- Symbol
- tsp
- Value in SI
- 1 Teaspoon (US) = 0.00492892 litre
- Typical use
- cooking
- Source
- UnitConvertLab measurement atlas
Every atlas conversion routes through the SI litre. See our methodology and data provenance pages for how these values are sourced and verified.
Related units and variant risk
Other cooking measures units in the Americas family, least settled first. If your figure came from a land record, invoice or historical document rather than a calculator, check these before assuming a single standard.
Related conversions
Frequently asked
How many millilitres are in a Teaspoon (US)?
1 Teaspoon (US) = 4.92892 millilitres. Multiply the number of Teaspoon (US) by 4.92892 to get millilitres.
What is Teaspoon (US) used for?
US teaspoon = 4.93ml. It is classified as active and dates from the modern period.
Is the Teaspoon (US) value exact?
Yes for practical purposes. UnitConvertLab converts every atlas unit through the SI litre, so the arithmetic itself introduces no rounding beyond the digits shown.
How reliable is this Teaspoon (US) conversion?
Conventional value — The unit is customary but its modern value is settled and widely cited; the arithmetic itself is exact. Source: UnitConvertLab measurement atlas.
Cite this page
UnitConvertLab. (2026). Convert Teaspoon (US) to millilitres. UnitConvertLab. Retrieved from https://unitconvertlab.com/regional/tsp-us-to-milliliter
Report an incorrect value or source
Regional units vary by district and by century. If this figure, its variant list or its citation is wrong where you are, tell us — the report carries the page context automatically.