US teaspoons to Millilitres converter
Convert US teaspoons (US tsp) to Millilitres (mL). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same volume quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
- Mixing US and imperial gallons or treating every recipe cup as the same volume.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the volume measurement guide · Calculation checks, sources and review limits
How do I convert US teaspoons to millilitres?
Enter the value in US teaspoons to find the same volume quantity in millilitres. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Compare capacities of containers or tanks.
- Convert recipe volumes using the stated US or imperial definitions.
How it works
For the displayed direction, 1 US tsp equals 4.92892159375 mL. The engine converts through the shared volume base quantity. Cups, pints, quarts, tablespoons and teaspoons use US customary liquid measures. Imperial gallons are separate. These are volume conversions; ingredient mass also depends on density. The multiplier is derived from the two centralized unit factors. Keep full precision until the final result; displayed answers use up to 12 significant digits.
Worked example
10 US tsp converts to 49.2892159375 mL. For the reverse direction, swap the units and enter 49.2892159375 mL; the result is approximately 10 US tsp.
FAQ
How do I convert US tsp to mL?
mL = US tsp × 4.92892159375
Which definition is used?
Cups, pints, quarts, tablespoons and teaspoons use US customary liquid measures. Imperial gallons are separate. These are volume conversions; ingredient mass also depends on density.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| US teaspoons | Millilitres |
|---|---|
| 1 | 4.92892 |
| 5 | 24.6446 |
| 10 | 49.2892 |
| 20 | 98.5784 |
| 30 | 147.868 |
| 50 | 246.446 |
| 100 | 492.892 |