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Equivalent volume
Accurate cooking and volume conversion tool for tsp and mL
Convert teaspoons to millilitres instantly with precise calculations. Supports both US and metric teaspoons with bidirectional conversion and full volume breakdowns for 2026.
Professional volume conversion for cooking, medicine, chemistry, and baking
Convert teaspoons to millilitres using the correct factor for your teaspoon type — US teaspoon (4.92892 mL) or metric teaspoon (5 mL exactly). Our Teaspoons to Millilitres Converter applies the precise legally defined values for each standard to deliver accurate results for any recipe, medical dosage, or scientific measurement.
Switch instantly between teaspoons to millilitres and millilitres to teaspoons conversion modes. Results are displayed across multiple volume units including tablespoons, fluid ounces, cups, and litres — giving you a complete measurement picture from a single input value for cooking or laboratory use.
Essential for recipe scaling, medication dosing, baking, food science, chemistry, and converting international recipe measurements. Whether you are converting a US recipe for a metric kitchen, measuring medicine for a child, or scaling a batch for commercial production, the Teaspoons to Millilitres Converter gives you fast and reliable results.
Select conversion direction, choose your teaspoon type, and enter your value below
The teaspoon (tsp) is a unit of volume used in cooking, baking, and medicine across the English-speaking world, while the millilitre (mL) is the SI metric unit of volume used universally in science, medicine, and in metric-system countries. Converting between these two units is one of the most common kitchen and medical volume conversions — needed whenever a recipe, dosage chart, or ingredient label uses a different measurement system to the one you are working in.
The conversion factor depends on which teaspoon standard you are using. The US teaspoon equals 4.92892159375 mL — exactly 1/6 of a US fluid ounce. The metric teaspoon equals exactly 5 mL and is used in Australia, Canada, and most countries that follow metric cooking standards. The Imperial teaspoon (used in the UK prior to metrication) equals approximately 5.91939 mL. For most modern recipes and everyday conversions, the choice between US and metric teaspoon affects results by less than 2%, but for precise pharmaceutical or scientific use, the correct standard must be applied.
Example (US): 3 tsp × 4.92892 = 14.787 mL | Example (Metric): 3 tsp × 5 = 15 mL
Use this reference table for quick Teaspoons to Millilitres lookups. Values cover the most common recipe and dosage amounts — shown for both the US teaspoon (4.9289 mL) and the metric teaspoon (5 mL) for easy comparison.
| Teaspoons (tsp) | mL (US tsp) | mL (Metric tsp) | Tablespoons (US) | Common Use |
|---|---|---|---|---|
| ¼ tsp | 1.232 mL | 1.25 mL | 0.083 tbsp | Pinch of salt/spice |
| ½ tsp | 2.464 mL | 2.5 mL | 0.167 tbsp | Small baking measure |
| ¾ tsp | 3.697 mL | 3.75 mL | 0.250 tbsp | Spice measurement |
| 1 tsp | 4.929 mL | 5 mL | 0.333 tbsp | Standard dose / 1 teaspoon |
| 2 tsp | 9.858 mL | 10 mL | 0.667 tbsp | Common medicine dose |
| 3 tsp | 14.787 mL | 15 mL | 1 tbsp | 1 tablespoon (US) |
| 4 tsp | 19.716 mL | 20 mL | 1.333 tbsp | Baking / sauce recipes |
| 5 tsp | 24.645 mL | 25 mL | 1.667 tbsp | Small liquid measure |
| 6 tsp | 29.574 mL | 30 mL | 2 tbsp | 2 tablespoons (US) |
| 10 tsp | 49.289 mL | 50 mL | 3.333 tbsp | Small cup recipe |
| 12 tsp | 59.147 mL | 60 mL | 4 tbsp | ¼ cup (US) |
| 24 tsp | 118.294 mL | 120 mL | 8 tbsp | ½ cup (US) |
| 48 tsp | 236.588 mL | 240 mL | 16 tbsp | 1 US cup |
The diagram below shows how teaspoons and millilitres relate to other common kitchen volume units — helping you put Teaspoons to Millilitres Converter results into practical cooking and measurement context.
A standard medicine dose of 5 mL equals exactly 1 metric teaspoon — used by pharmacists and doctors worldwide for liquid medication dosing
The US teaspoon equals exactly 4.92892159375 mL — defined as 1/6 of a US fluid ounce or 1/3 of a US tablespoon. It is the standard used in American cookbooks and recipe websites. US teaspoons are very slightly smaller than metric teaspoons, which can affect precision baking when recipes are converted without adjusting the factor.
The metric teaspoon equals exactly 5 mL — a clean round number used in Australia, Canada, New Zealand, and most countries that have adopted metric cooking standards. Because it equals exactly 5 mL, the metric teaspoon is the simplest of all teaspoon standards to work with and is the most widely used globally today.
The British Imperial teaspoon equals approximately 5.91939 mL — about 18.4% larger than the metric teaspoon. While the UK now uses metric measurements in official cooking and medicine, the Imperial teaspoon may still appear in older British recipes and cookbooks. Recipes from pre-1970s UK publications should be checked for Imperial measurements.
In medicine and pharmacy, the metric teaspoon of exactly 5 mL is the universal standard. Liquid medication doses such as "5 mL three times daily" refer to this metric teaspoon. Using a measuring spoon or syringe rather than a kitchen spoon is critical — kitchen teaspoons vary from 3 mL to 7 mL in capacity and should never be used for medication dosing.
In US and metric cooking, 3 teaspoons equals exactly 1 tablespoon. This means 1 tablespoon = 14.787 mL (US) or 15 mL (metric). This relationship is used constantly in recipe scaling — if a recipe calls for 1 tablespoon, you can use 3 teaspoons instead, and 15 mL corresponds to both for most practical cooking purposes.
The millilitre (mL) is a metric unit of volume equal to one cubic centimetre (1 cm³) or 1/1000 of a litre. It is the standard unit for liquid measurements in chemistry, biology, and medicine worldwide. One mL of water at 4°C has a mass of exactly 1 gram, making mL and grams interchangeable for water-based solutions in many recipes and formulations.
For everyday cooking and most recipe conversions, use 1 teaspoon = 5 mL (the metric standard). This gives clean, round numbers: 2 tsp = 10 mL, 3 tsp = 15 mL, 4 tsp = 20 mL. The difference between the US teaspoon (4.929 mL) and metric teaspoon (5 mL) is less than 1.5% — negligible for all but the most precise recipes. Use our Teaspoons to Millilitres Converter above for exact results in any standard.
Our converter is designed for speed and accuracy whether you are in the kitchen, pharmacy, or laboratory. Follow these simple steps:
This reverse reference table shows common millilitre values converted to teaspoons — useful when working from metric recipes or medicine labels and needing equivalent teaspoon quantities for kitchen spoon measurements or reference.
| Millilitres (mL) | US Teaspoons | Metric Teaspoons | Tablespoons (US) | Common Use |
|---|---|---|---|---|
| 1 mL | 0.203 tsp | 0.2 tsp | 0.068 tbsp | Small medicine drop |
| 2.5 mL | 0.507 tsp | 0.5 tsp | 0.169 tbsp | Half metric teaspoon |
| 5 mL | 1.014 tsp | 1 tsp | 0.338 tbsp | Standard 5 mL dose |
| 10 mL | 2.029 tsp | 2 tsp | 0.676 tbsp | Common medicine dose |
| 15 mL | 3.043 tsp | 3 tsp | 1 tbsp | 1 tablespoon (US) |
| 20 mL | 4.058 tsp | 4 tsp | 1.353 tbsp | Small recipe measure |
| 25 mL | 5.072 tsp | 5 tsp | 1.691 tbsp | Sauce or dressing |
| 30 mL | 6.086 tsp | 6 tsp | 2 tbsp | 2 tablespoons / 1 fl oz |
| 50 mL | 10.144 tsp | 10 tsp | 3.381 tbsp | Small cup portion |
| 100 mL | 20.288 tsp | 20 tsp | 6.763 tbsp | Small juice glass |
| 250 mL | 50.721 tsp | 50 tsp | 16.907 tbsp | 1 metric cup |
| 500 mL | 101.442 tsp | 100 tsp | 33.814 tbsp | Half litre bottle |
Kitchen teaspoons vary widely in actual volume — typically between 3 mL and 7 mL — and should never be used to measure liquid medications. Always use a calibrated medicine spoon, dosing syringe, or measuring cup for pharmaceutical doses. The standard medical teaspoon is exactly 5 mL, which is the metric teaspoon value used by doctors, pharmacists, and medication labels worldwide. Our Teaspoons to Millilitres Converter uses this 5 mL metric standard by default.
Cooking is the most common everyday context for the Teaspoons to Millilitres Converter. Recipes from the United States use teaspoons (tsp) and tablespoons (tbsp) as standard volume measures, while Australian, British, and European recipes increasingly use millilitres or grams. When following a US recipe in a metric kitchen, knowing that 1 tsp ≈ 5 mL allows you to use a standard 5 mL metric measuring spoon with excellent accuracy for virtually any ingredient — spices, extracts, baking powder, salt, and liquids alike.
Baking is more sensitive to measurement precision than general cooking, making accurate conversion especially important for leavening agents like baking powder and baking soda, where even a small error can affect rise and texture. A recipe calling for 1 tsp baking powder means 4.929 mL (US) or 5 mL (metric) — a difference of less than 0.1 mL that is irrelevant for home baking. For professional or commercial baking production, use a digital scale for all ingredient measurements, as weight measurements using grams are more consistent than volume conversions across all recipe scales.
The International Bureau of Weights and Measures (BIPM) defines the millilitre as 1/1000 of a litre (1 cm³). The metric teaspoon of exactly 5 mL is widely adopted in international cooking standards and WHO pharmaceutical guidelines. The BIPM ensures global consistency in volume measurement standards used across science, medicine, and commerce.
Visit BIPM →The US National Institute of Standards and Technology (NIST) defines the US teaspoon as exactly 4.92892159375 mL (1/6 US fluid ounce). Their Handbook 44 and Special Publication 811 provide the official US customary volume unit definitions and conversion factors used in American food labelling, commerce, and engineering.
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