Quick Conversions:

Converting teaspoons to millilitres is essential for anyone following recipes, whether you’re baking a Victoria sponge or measuring out medication. A UK teaspoon holds 5.92 mL, whilst the metric teaspoon commonly used in modern British kitchens is exactly 5 mL. This difference matters when precision counts.

Teaspoon to Millilitre Conversion Table

Here’s a practical reference showing common teaspoon measurements and their millilitre equivalents for UK teaspoons.

Teaspoons (UK) Millilitres (mL) Fluid Ounces (fl oz)
¼ tsp 1.48 mL 0.05 fl oz
½ tsp 2.96 mL 0.10 fl oz
¾ tsp 4.44 mL 0.15 fl oz
1 tsp 5.92 mL 0.21 fl oz
1½ tsp 8.88 mL 0.31 fl oz
2 tsp 11.84 mL 0.42 fl oz
3 tsp (1 tbsp) 17.76 mL 0.63 fl oz
4 tsp 23.68 mL 0.83 fl oz
5 tsp 29.60 mL 1.04 fl oz
10 tsp 59.19 mL 2.08 fl oz

Conversion Formula

UK Teaspoon to Millilitres:

mL = teaspoons × 5.92

Metric Teaspoon to Millilitres:

mL = teaspoons × 5

Millilitres to UK Teaspoons:

teaspoons = mL ÷ 5.92

For a UK teaspoon, multiply the number of teaspoons by 5.92 to get millilitres. If you’re converting the other way round, divide millilitres by 5.92. Most modern UK recipes use the metric standard of 5 mL per teaspoon for simplicity.

Step-by-Step Conversion

Converting between teaspoons and millilitres takes just three steps:

  • Identify which teaspoon measurement you’re starting with (UK imperial at 5.92 mL or metric at 5 mL)
  • Multiply your teaspoon quantity by the appropriate conversion factor
  • Round to two decimal places for practical kitchen use

For example, to convert 2.5 UK teaspoons: 2.5 × 5.92 = 14.8 mL. When working with metric teaspoons, the maths is simpler: 2.5 × 5 = 12.5 mL.

Everyday Kitchen Scenarios

British cooks encounter teaspoon-to-millilitre conversions in various situations throughout the day.

Baking

Vanilla extract, baking powder, and bicarbonate of soda require precise measurements. A recipe calling for 1 tsp of baking powder needs exactly 5.92 mL for the UK measurement or 5 mL metric.

Beverages

Tea and coffee enthusiasts measure sugar carefully. Two teaspoons of sugar in your morning brew equals roughly 11.84 mL (UK) or 10 mL (metric).

Cooking

Salt, spices, and herbs need careful measurement. A curry recipe requiring ½ tsp of turmeric translates to 2.96 mL (UK) or 2.5 mL (metric).

Medicine

Liquid medications often specify dosages in millilitres. Knowing that 1 tsp equals approximately 5-6 mL helps when measuring children’s medicine safely.

UK vs US vs Metric Teaspoons

Not all teaspoons are created equal. The differences between regional standards affect recipe outcomes, particularly in baking where precision matters.

Type Volume (mL) Fluid Ounces Where Used
UK Imperial 5.92 mL 0.21 fl oz Traditional British recipes
Metric 5.00 mL 0.18 fl oz Modern UK, Europe, Australia
US 4.93 mL 0.17 fl oz American recipes

UK teaspoons are roughly 20% larger than American ones. When following a recipe from across the pond, this difference can throw off delicate dishes. Most contemporary British cookbooks have shifted to metric measurements (5 mL) to align with European standards and simplify conversions.

Tablespoons and Other Spoon Measures

British kitchens traditionally use three spoon measurements, each with specific volumes.

Spoon Type UK Volume Metric Equivalent Teaspoon Ratio
Teaspoon 5.92 mL 5 mL 1 tsp
Dessertspoon 11.84 mL 10 mL 2 tsp
Tablespoon 17.76 mL 15 mL 3 tsp

The dessertspoon, unique to British measurements, sits between a teaspoon and tablespoon. It’s gradually falling out of use as more cooks adopt metric measurements. One UK tablespoon equals three teaspoons, a ratio that holds true across all measurement systems.

Common Ingredients by Teaspoon

Different ingredients have varying densities, but their volume remains constant. Here’s what fits in a teaspoon.

Ingredient 1 Teaspoon (UK) Weight
Water 5.92 mL 5.92 g
Granulated sugar 5.92 mL 4.2 g
Salt (table) 5.92 mL 6 g
Flour (plain) 5.92 mL 2.5 g
Honey 5.92 mL 7 g
Olive oil 5.92 mL 5.4 g
Baking powder 5.92 mL 4.8 g
Vanilla extract 5.92 mL 5.9 g

Related Volume Conversions

Other common kitchen volume conversions you might need alongside teaspoon measurements.

From To Conversion
Tablespoon Millilitres 1 tbsp = 17.76 mL (UK) or 15 mL (metric)
Fluid ounce Millilitres 1 fl oz = 28.41 mL (UK)
Cup Millilitres 1 cup = 284 mL (UK) or 250 mL (metric)
Pint Millilitres 1 pint = 568 mL (UK)
Dessertspoon Millilitres 1 dstsp = 11.84 mL (UK) or 10 mL (metric)

Tips for Accurate Measuring

Getting your teaspoon measurements right makes the difference between a perfect dish and a disappointing one.

  • Level off dry ingredients with a straight edge rather than heaping the spoon
  • Pour liquids at eye level to avoid parallax errors that throw off measurements
  • Use proper measuring spoons rather than cutlery teaspoons, which vary widely in size
  • Check whether your recipe specifies UK imperial, metric, or US measurements
  • When halving recipes, remember that ½ of ½ tsp equals ¼ tsp (1.48 mL UK or 1.25 mL metric)
  • Keep your measuring spoons dry when measuring dry ingredients to prevent clumping

FAQs

How many mL in a teaspoon UK?
A UK imperial teaspoon contains 5.92 mL. However, most modern British recipes use the metric standard of 5 mL per teaspoon. The difference is small enough that it rarely affects home cooking, though professional bakers prefer precision.
Is a UK teaspoon the same as a US teaspoon?
No, they differ in size. A UK teaspoon holds 5.92 mL whilst a US teaspoon holds 4.93 mL. UK teaspoons are approximately 20% larger. This matters when following American recipes, particularly for baking where precision affects results.
How many teaspoons equal one tablespoon?
Three teaspoons equal one tablespoon in both UK and metric measurements. A UK tablespoon holds 17.76 mL (3 × 5.92 mL), whilst a metric tablespoon contains 15 mL (3 × 5 mL).
Can I use regular cutlery spoons for measuring?
Regular teaspoons from your cutlery drawer vary significantly in size and aren’t reliable for recipes. Proper measuring spoons ensure consistency. Cutlery teaspoons typically hold anywhere from 3-7 mL, which can ruin precise recipes.
What’s the difference between a dessertspoon and a teaspoon?
A dessertspoon is twice the size of a teaspoon. One dessertspoon equals 11.84 mL (UK) or 10 mL (metric), whilst a teaspoon holds 5.92 mL (UK) or 5 mL (metric). Dessertspoons are less common in modern recipes.
How do I convert American recipes to UK measurements?
For teaspoons, multiply the US quantity by 0.83 to get UK teaspoons, or by 0.986 to get metric teaspoons. For practical purposes, using the same number of teaspoons works for most recipes, but increase other ingredients by about 20% when scaling up American baking recipes.
Why do some recipes use mL instead of teaspoons?
Millilitres provide universal precision regardless of which country’s measuring spoons you own. Professional recipes and scientific cooking prefer mL because they eliminate confusion between UK, US, and metric standards. It’s particularly important for recipes shared internationally.
How many mL is half a teaspoon?
Half a UK teaspoon equals 2.96 mL, whilst half a metric teaspoon equals 2.5 mL. This small measurement is common for spices, vanilla extract, and baking powder in recipes.

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