Single conversion
3 tsp converts to approximately 15 mL. This is the direct calculator result using the standard factor.
Common conversion calculator
Teaspoons to ML Converter
Convert teaspoons to millilitres with the exact formula, clear rounding notes and practical examples for everyday use.
On this page
How to convert teaspoons to millilitres
input × 5
A standard metric teaspoon is 5 mL.
A standard metric teaspoon is 5 mL, which makes this conversion straightforward for recipes and small household liquid measures. Kitchen spoons themselves are not calibrated measuring devices.
Worked examples
Reverse check
If you convert 15 mL back, you get approximately 3 tsp. A tiny difference can appear because the displayed number is rounded.
Three teaspoons is 15 mL, the same volume commonly associated with a 15 mL tablespoon outside Australia.
Quick teaspoons to millilitres reference values
The table applies the same teaspoons to millilitres formula used by the calculator.
| Metric Teaspoons | Millilitres |
|---|---|
| 0.25 | 1.25 |
| 0.5 | 2.5 |
| 1 | 5 |
| 2 | 10 |
| 3 | 15 |
| 4 | 20 |
| 6 | 30 |
Use the nearest row to test whether a millilitres result is in the right range. Do not copy a rounded table value when the original metric teaspoons measurement is more precise or the decision is close to a practical threshold.
Australian teaspoon example: 3 tsp
An Australian metric teaspoon is 5 mL. Therefore 3 metric teaspoons = 15 mL. For a recipe requiring 2½ metric teaspoons, calculate 2.5 × 5 = 12.5 mL.
Australian tablespoons are usually 20 mL, whereas tablespoons in many international recipes are smaller. Do not swap a tablespoon for three teaspoons without first confirming the recipe's measuring system.
Rounding, accuracy and common mistakes
Whole millilitres work for ordinary recipes. For medicine or concentrated products, follow the labelled dose and use the supplied oral syringe, cup or calibrated device.
Multiply the measured teaspoon quantity by 5; convert fractions before rounding the final mL value.
Precision example: 1.5 teaspoons×5=7.5 mL. Use a marked measure that can reproduce the half-teaspoon quantity.
Printable chart and related converters
The cooking chart is useful for common teaspoon fractions. Use the calculator for a scaled recipe, then measure with a marked utensil.
Cooking Measurement Conversion Chart
Use this printable reference for common teaspoons to millilitres values, then return to the calculator for a specific or decimal input.
Open printable chartTeaspoons to ML Converter FAQs
What is the formula for teaspoons to ml?
millilitres = teaspoons × 5.
How should I round teaspoons to millilitres?
Whole millilitres work for ordinary recipes. For medicine or concentrated products, follow the labelled dose and use the supplied oral syringe, cup or calibrated device.
What should I check before using the converted millilitres value?
Do not use a household teaspoon to estimate medication doses; the conversion is exact but the spoon volume may not be.
Cooking measures and medicine doses
This page is for kitchen volume conversion using a 5 mL metric teaspoon, not for measuring medication with cutlery. Household teaspoons can hold different amounts; use the supplied oral syringe or dosing device for medicines.
For other recipe volumes, compare tablespoons to mL and the Australian cooking measures guide.
Bottom line
Use this page for a transparent teaspoons to millilitres calculation, keep the source and result together, and apply the original source’s accuracy and limits. Do not use a household teaspoon to estimate medication doses; the conversion is exact but the spoon volume may not be.
Reviewed for calculator quality: This unit conversion calculator was checked for input clarity, formula notes, rounding behaviour, examples, related links and general-information limitations. See the methodology notes and editorial review profile.