Teaspoon to mL Calculator 2026
Instantly convert teaspoons to milliliters and back, scale a full recipe across cups, tablespoons, teaspoons and mL, and see how US, UK, Metric and Australian teaspoons actually compare. Free, instant, no login.
Quick Convert, Recipe Scale, or Compare?
Whether you need a single quick conversion, want to scale an entire recipe across units, or need to see how teaspoon sizes differ by country, pick the tool below to get instant results.
Teaspoon ⇄ mL Converter
Convert instantly in either direction using your chosen standard
Choose the teaspoon standard you’re cooking with
Enter the number of teaspoons
Conversion Result
Your converted amount and quick equivalents
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Recipe Converter
Convert one ingredient amount into every common cooking unit
Australia uses a 20 mL (4 tsp) tablespoon — see the note below
Recipe Conversion Result
Your amount across every common cooking unit
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Teaspoon Standard Comparator
See how the same number of teaspoons differs by country
See this amount in mL across four standards at once
Standard Comparison
Same teaspoon count, four measurement systems
Enter a teaspoon amount, then click Compare Standards.
Teaspoon & mL Quick Reference
Standard cooking-measurement equivalents. Metric and Australian teaspoons are defined as exactly 5 mL; US and UK Imperial teaspoons are slightly different sizes derived from their respective fluid ounce standards.
| Measurement | Value | Notes |
|---|---|---|
| US Teaspoon | 4.92892 mL | Rounded to 5 mL on most labels |
| Metric Teaspoon | 5 mL | Exact, used in most recipes worldwide |
| Australian Teaspoon | 5 mL | Same as Metric; tablespoon differs |
| UK Imperial Teaspoon | 5.91939 mL | Rarely used today; mostly historical |
| US Tablespoon | 14.7868 mL (3 tsp) | Standard across US recipes |
| Australian Tablespoon | 20 mL (4 tsp) | Exception — larger than other standards |
| US Cup | 236.588 mL (48 tsp) | Also equals 16 US tablespoons |
| Metric Cup | 250 mL (50 tsp) | Used in Australia, UK & New Zealand |
| US Fluid Ounce | 29.5735 mL (6 tsp) | 1/8 of a US cup |
| 1 Liter | 1,000 mL (~200 tsp) | Approx. based on Metric teaspoon |
Teaspoon to mL FAQ
Everything home cooks and bakers ask about converting teaspoons to milliliters.
A US teaspoon equals 4.92892 mL, which is almost always rounded to 5 mL for cooking and nutrition labeling. A UK/Imperial teaspoon is slightly larger at 5.91939 mL, while the Metric and Australian teaspoon are both exactly 5 mL.
Not exactly, but it’s close enough for almost all cooking purposes. A US teaspoon is technically 4.92892 mL, rounded to 5 mL on nutrition labels and most recipes. Metric and Australian teaspoons are defined as exactly 5 mL, while the older UK Imperial teaspoon is 5.91939 mL.
In the US, UK and Metric systems, 1 tablespoon equals 3 teaspoons. Australia is the exception: an Australian tablespoon equals 4 teaspoons (20 mL) instead of 3, which can throw off recipe conversions if you’re not careful.
Historically, spoon measurements were based on physical household spoons rather than a single international standard, so US, UK/Imperial, and Australian systems each rounded differently when metric equivalents were assigned. Modern Metric and Australian teaspoons were standardized at 5 mL, while the US teaspoon derives from the US customary fluid ounce and the UK Imperial teaspoon derives from the Imperial fluid ounce.
A US cup contains 48 US teaspoons (about 236.6 mL total). A Metric cup, used in Australia, is typically defined as 250 mL, which works out to 50 Metric teaspoons.
For most everyday cooking, the small gap between a US teaspoon (4.93 mL) and a Metric teaspoon (5 mL) is negligible. It matters more in baking, where precise leavening agents like baking soda or yeast are sensitive to quantity, and especially in medicine dosing, where using a kitchen spoon instead of a proper measuring device can lead to meaningful under- or over-dosing.
A standard metal or plastic kitchen teaspoon is close enough to 5 mL for most everyday recipes, but for baking or medicine it’s best to use a calibrated measuring spoon or a small liquid measuring cup with mL markings, since kitchen “teaspoons” used as cutlery vary in actual volume far more than labeled measuring spoons do.