US Teaspoons to mL Converter | Exact Formula + Chart

A US teaspoon (tsp) is a common unit of volume used in American cooking, baking, recipes, and medicine. If you need to convert US teaspoons to mL (milliliters) instantly, the conversion is simple:

1 US Teaspoon = 4.92892 mL.

Use our free calculator below, plus the exact formula, chart, and cooking examples.

Table of Contents

Toggle

US Teaspoons to mL Converter

Convert US teaspoons (tsp) to milliliters (mL), or mL to US teaspoons, instantly.

Amount

US teaspoons → mL mL → US teaspoons

⇅

Result

4.9289 mL

1 US tsp × 4.92892159375 = 4.9289 mL

Common conversions

1/4 tsp 1/2 tsp 1 tsp 2 tsp 3 tsp 4 tsp

Exact Conversion: US Teaspoon to mL

The exact traditional US teaspoon is defined as 1/3 of a US tablespoon. Using the US customary volume conversion:

1 US Teaspoon = 4.92892159375 mL

For practical use, this is commonly rounded to

• 4.92892 mL—5 decimal places
• 4.929 mL—3 decimal places
• 4.93 mL—2 decimal places
• ≈ 5 mL — convenient cooking approximation

For everyday cooking, the value is commonly rounded to 4.93 mL. This small difference makes calculations easier and is generally negligible in most recipes.

Formula: How to Convert US Teaspoons to mL

Here is the exact formula and the simple math for converting US teaspoons to mL:

The Exact Formula:

Examples:

• 1/2 US tsp × 4.92892 = 2.46 mL ≈ 2.5 mL
• 1 US tsp × 4.92892 = 4.92892 mL ≈ 4.93 mL
• 2 US tsp × 4.92892 = 9.85784 mL ≈ 9.86 mL
• 3 US tsp × 4.92892 = 14.78676 mL ≈ 14.79 mL
• 5 US tsp × 4.92892 = 24.6446 mL ≈ 24.64 mL
• 10 US tsp × 4.92892 = 49.2892 mL ≈ 49.29 mL

For everyday cooking, 1 US teaspoon is approximately 4.93 mL and is often rounded to 5 mL. For medication dosing, follow the measurement provided on the medicine label or dosing device rather than relying on a teaspoon conversion.

The Reverse Formula (mL → Teaspoons)

If you have mL and need teaspoons:

teaspoons = mL ÷ 4.92892

Example:

• 2.5 mL ÷ 4.92892 = 0.507 tsp (about 1/2 teaspoon)
• 5 mL ÷ 4.92892 = 1.014 tsp (about 1 teaspoon)
• 10 mL ÷ 4.92892 = 2.03 tsp (about 2 teaspoons)
• 15 mL ÷ 4.92892 = 3.043 tsp (about 3 teaspoons)
• 20 mL ÷ 4.92892 = 4.058 tsp (about 4 teaspoons)

US Teaspoons to mL Chart (For Baking & Cooking)

This US teaspoon-to-milliliter useful shorter chart covers the standard measuring spoon sets found in US kitchens. It is perfect for everyday cooking, baking, and liquid measuring.

US Teaspoons	Exact mL	Rounded mL
1/8 tsp (pinch)	0.62 mL	0.6 mL
1/4 tsp	1.23 mL	1.2 mL
1/3 tsp	1.64 mL	1.6 mL
1/2 tsp	2.46 mL	2.5 mL
2/3 tsp	3.29 mL	3.3 mL
3/4 tsp	3.70 mL	3.7 mL
1 tsp	4.9289 mL	4.93 mL
1 1/2 tsp	7.39 mL	7.4 mL
2 tsp	9.8578 mL	9.86 mL
2 1/2 tsp	12.32 mL	12.3 mL
3 tsp (1 tbsp)	14.7868 mL	14.79 mL

US Teaspoons to mL Chart (For Large Batches & Scaling Recipes)

This US teaspoons to mL table is designed for professional bakers, bartenders, or anyone scaling up a recipe to large quantities. It removes the fractions and focuses on whole numbers.

US Teaspoons	Exact mL	Rounded mL
4 tsp	19.7157 mL	19.72 mL
5 tsp	24.6446 mL	24.64 mL
6 tsp (2 tbsp)	29.5735 mL	29.57 mL
7 tsp	34.5025 mL	34.50 mL
8 tsp	39.4314 mL	39.43 mL
9 tsp	44.3603 mL	44.36 mL
10 tsp	49.2892 mL	49.29 mL
11 tsp	54.2181 mL	54.22 mL
12 tsp (1/4 cup)	59.1471 mL	59.15 mL
13 tsp	64.0760 mL	64.08 mL
14 tsp	69.0049 mL	69.00 mL
15 tsp	73.9338 mL	73.93 mL
16 tsp	78.8627 mL	78.86 mL
17 tsp	83.7917 mL	83.79 mL
18 tsp	88.7206 mL	88.72 mL
19 tsp	93.6495 mL	93.65 mL
20 tsp	98.5784 mL	98.58 mL
25 tsp	123.2230 mL	123.22 mL
30 tsp	147.8676 mL	147.87 mL
40 tsp	197.1569 mL	197.16 mL
50 tsp	246.4461 mL	246.45 mL

When you are measuring large batches (like 25 or 50 teaspoons), keeping the two decimal places (like 123.22 or 246.45) is better because you are likely using a precise digital scale where these small decimal differences matter much more to the final result.

Common US Cooking Examples: Teaspoons to mL

Here are some common US cooking examples that show exactly how US teaspoons translate to milliliters (mL) in real recipes.

Baking Powder / Baking Soda (Leaveners)

• Recipe says: 1 teaspoon baking powder
• You measure: 4.93 mL—frequently used in cakes, muffins, and pancakes.

Salt (Seasoning)

• Recipe says: 1/2 teaspoon salt
• You measure: 2.46 mL—commonly used to season soups, sauces, vegetables, or meat.

Spices (cinnamon, black pepper, garlic powder)

• Recipe says: 1/4 teaspoon black pepper
• You measure: 1.2 mL—commonly added to soups, sauces, and savory dishes (roasted chicken soup, pasta with sauce, mashed potatoes, scrambled eggs, steak, and roasted vegetables).

Vanilla Extract (Flavoring)

• Recipe says: 2 teaspoons vanilla extract
• You measure: 9.86 mL—commonly used in cookies, pancakes, custards, and other baked goods.

Oil or Butter (Melted)

• Recipe says: 2 teaspoons olive oil (for sautéing a small portion)
• You measure: 9.86 mL

Honey or Maple Syrup (Sticky Liquids)

• Recipe says: 1½ teaspoons honey
• You measure: 9.86 mL—Common in: glazes or oatmeal toppings.

Lemon Juice or Vinegar (Acid)

• Recipe says: 1 tablespoon = 3 teaspoons.
• That is: 14.79 mL (3 × 4.93 mL)
• Salad dressing or marinade—often calls for “1 tbsp lemon juice,” which is 3 tsp = 14.79 mL.

Liquid Medicine / Extracts (in baking)

• Recipe says: 3/4 teaspoon almond extract.
• You measure: 3.70 mL

A US teaspoon is traditionally defined as approximately 4.93 mL, but physical measuring spoons labeled “1 tsp” sold in the US may be manufactured to practical tolerances and are often treated as approximately 5 mL in everyday cooking.

• 3 tsp = 1 tablespoon = 14.79 mL
• 48 tsp = 1 US cup = 236.59 mL

US Teaspoon vs UK Teaspoon vs Other Teaspoon

Be careful! UK and metric recipes use a different size.

Teaspoon Type	Volume in mL	Difference
US Teaspoon	4.92892 mL
UK (Old Imperial) Teaspoon	5.9194 mL	+0.9905 mL
UK Modern Teaspoon	5.00 mL	+0.0711 mL
Metric teaspoon	5.00 mL	+0.0711 mL
Australian teaspoon	5.00 mL	+0.0711 mL
Canadian teaspoon	5.00 mL	+0.0711 mL

For modern recipes, the US vs. metric/Australian difference is very small, but the UK (Old Imperial) teaspoon difference is much more noticeable. A UK imperial teaspoon is about 20% larger than a US teaspoon.

The UK imperial teaspoon is a historical measurement and is no longer the standard teaspoon used in modern UK recipes. Modern UK recipes generally use a metric teaspoon of 5 mL. The Imperial teaspoon, approximately 5.92 mL, may still be encountered in older British recipes and cookbooks.

US Teaspoons vs. Ounces by Weight

In the US system, a standard teaspoon is a unit of volume, while an ounce by weight is a unit of mass. Therefore, 1 US teaspoon does not have a single equivalent in ounces by weight. The weight depends on the ingredient being measured.

1 US teaspoon = 4.92892 mL ≈ 5 mL = 1/6 US fluid ounce = 1/3 US tablespoon = 1/48 US cup

A US teaspoon is a unit of volume (it measures space, not heaviness). Here are some practical examples of what that means in everyday cooking, complete with exact measurements:

Unit	Equivalent to 1 US Teaspoon
Metric (mL)	Exactly 4.92892 mL (commonly rounded to 4.93 mL or 5 mL)
US Fluid Ounces	0.16667 fl oz (exactly 1/6 US fl oz)
US Tablespoons	1/3 tablespoon (3 tsp = 1 Tbsp)
US Cups	1/48 cup (48 tsp = 1 cup)
Milliliters (visual)	About 5 mL—the 5 mL mark on a standard oral syringe

Volume to Weight Examples:

1 US tsp	Volume	Weight
Water	4.93 mL	4.93 grams
Granulated sugar	4.93 mL	4.8 grams
Honey	4.93 mL	8.2 grams
All-Purpose Flour	4.93 mL	2.8 grams
Cocoa Powder	4.93 mL	2.3 grams
Fine Salt	4.93 mL	6.8 grams

A US ounce by weight (oz) is a mass measurement: it measures mass, not volume.

1 oz = 28.3495 grams

Here are some common US cooking examples of ounces by weight (oz).

Ingredient	Weight	What it means
All-purpose flour	4 oz	Weigh 4 ounces of flour on a kitchen scale
Granulated sugar	8 oz	Weigh 8 ounces of sugar
Butter	4 oz	Weigh 4 ounces of butter
Cheese	8 oz	A typical package of shredded or block cheese
Ground beef	8 oz	A half-pound portion

Simple examples to understand:

• 4 oz flour → measure 4 ounces by weight on a kitchen scale.
• 8 oz cheese → 8 ounces by weight = 226.8 g.
• 16 oz ground beef → 1 pound = 453.6 g.
• 2 oz chocolate → 56.7 g.

In US recipes, “oz” generally refers to ounces by weight, while “fl oz” refers to US fluid ounces by volume. When a recipe specifies ounces by weight, use a kitchen scale for accurate measurement.

Always pay attention to the context in a recipe. The term “ounce” (oz) generally refers to weight, while “fluid ounce” (fl oz) refers to volume.

Frequently Asked Questions