Teaspoons to ml
Convert teaspoons to milliliters for recipes, baking and medication dosing. This tool uses the metric 5 mL teaspoon; the US teaspoon is 4.92892 mL. See the country standards in the reference table.
Last updated: May 2026
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Converting teaspoons to millilitres
Teaspoons are a common recipe measure, while milliliters are precise for baking and medicine dosing. Use this converter when a recipe lists teaspoons but you measure in mL. This tool uses the metric teaspoon of exactly 5 ml: ml = tsp × 5. A US teaspoon is slightly smaller at 4.92892 ml (about 1.4% less), so see the standards table below if your recipe is US based.
Teaspoon standards by country and system
The word "teaspoon" does not mean the same volume everywhere. Most measuring systems define a teaspoon as exactly 5 ml, which is the value this converter uses. The United States is the main exception, where the legal teaspoon is 4.92892 ml, roughly 1.4% smaller. Australia matches the 5 ml teaspoon but defines its tablespoon as 20 ml (4 teaspoons) instead of the 15 ml (3 teaspoons) used elsewhere, so the tablespoon row is shown for contrast.
| System | Teaspoon | Note |
|---|---|---|
| Metric | 5 ml | Exact definition used by this converter |
| UK | 5 ml | Same as metric |
| Canada | 5 ml | Same as metric |
| US | 4.92892 ml | About 1.4% smaller than 5 ml |
| Australia (tablespoon) | 20 ml | Tablespoon, not a teaspoon; equals 4 teaspoons, shown for contrast |
Teaspoon conversions for cooking and medicine
Teaspoons appear in both culinary recipes and liquid medicine dosing instructions. This table covers the most common amounts in both contexts, using the standard 5 ml per teaspoon that most countries follow.
| Amount | Millilitres | Common use |
|---|---|---|
| 1/4 teaspoon | 1.25 ml | Salt, baking soda (small batches) |
| 1/2 teaspoon | 2.5 ml | Spices, extract, medicine |
| 1 teaspoon | 5 ml | Standard medicine dose, vanilla extract |
| 2 teaspoons | 10 ml | Liquid medicine (children) |
| 1 tablespoon (3 tsp) | 15 ml | Oils, soy sauce, syrups |
| 2 tablespoons (6 tsp) | 30 ml | Shot of espresso, dressings |
Frequently Asked Questions
Why convert between teaspoons and milliliters?
Recipes and cooking instructions use different volume units depending on region. Teaspoons are common in US recipes, while milliliters are standard in metric countries and professional cooking. Converting between them ensures accuracy in baking and precise ingredient measurement.
Is 1 teaspoon exactly 5 milliliters?
It depends on the system. The metric teaspoon, used in the UK, Canada and most countries, is exactly 5 ml, and that is the definition this converter uses. The US teaspoon is the exception at 4.92892 ml, about 1.4% smaller. For everyday cooking the difference is negligible, but for precise baking or medication dosing, confirm which standard your recipe follows.
What is the difference between a US teaspoon and a metric teaspoon?
A metric teaspoon equals exactly 5 ml and is used in the UK, Canada, Australia and most metric countries. A US teaspoon equals 4.92892 ml, roughly 1.4% smaller. This converter uses the metric 5 ml teaspoon, so multiply your US recipe amounts by 4.92892 instead of 5 if you need the exact US figure. Always check your recipe source to confirm which definition is intended.
How many ml is one teaspoon?
One teaspoon equals exactly 5 ml on the metric standard used here, which the UK, Canada and most metric countries follow. The US teaspoon is the exception at 4.92892 ml, about 1.4% smaller. Australia keeps the 5 ml teaspoon but uses a larger 20 ml tablespoon (4 teaspoons rather than 3). For everyday medicine and cooking the conversion is 1 tsp = 5 ml, 2 tsp = 10 ml, 3 tsp = 15 ml (= 1 tablespoon).
How many teaspoons are in 15 ml?
15 ml equals 3 teaspoons, which is also 1 tablespoon. This is a common recipe conversion: if a recipe calls for 15 ml of vanilla extract and you only have a teaspoon measure, use 3 level teaspoons. For 10 ml use 2 teaspoons; for 5 ml use 1 teaspoon; for 2.5 ml use 1/2 teaspoon.