Click one of the common conversions below or use our calculator to convert tsp to mL.
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Most Common tsp to mL Conversions
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Specific tsp to mL Conversions
1 tsp to mL
1 tsp to mL is 4.93 mL. For quick kitchen measuring, this is commonly rounded to 5 mL.
This is the base reference for almost every teaspoon-to-milliliter conversion in cooking and baking.
2 tsp to mL
2 tsp to mL is 9.86 mL, which is usually rounded to 10 mL in kitchen conversions.
This amount comes up often when doubling a 1 teaspoon ingredient in a recipe.
1/2 tsp to mL
1/2 tsp to mL is 2.46 mL. In everyday cooking, it is usually rounded to 2.5 mL.
This is one of the most common measurements for vanilla, spices, salt, and baking powder.
3/4 tsp to mL
3/4 tsp to mL is 3.70 mL, and many kitchen charts round it to 3.75 mL.
This is a handy conversion when scaling recipes and you do not have a dedicated 3/4 teaspoon measure.
1/4 tsp to mL
1/4 tsp to mL is 1.23 mL. For quick measuring, it is often rounded to 1.25 mL.
This small measurement is common for salt, baking soda, and concentrated spice additions.
1.5 tsp to mL
1.5 tsp to mL is 7.39 mL, usually rounded to 7.5 mL for kitchen use.
This is an especially useful conversion because 1.5 teaspoons equals half of a tablespoon.
1/8 tsp to mL
1/8 tsp to mL is 0.62 mL. A quick kitchen approximation is about 0.63 mL.
Very small measurements like this are common for strong spices, yeast, and concentrated flavorings.
3 tsp to mL
3 tsp to mL is 14.79 mL, which is commonly rounded to 15 mL.
This is one of the most important kitchen references because 3 teaspoons equals 1 tablespoon.
4 tsp to mL
4 tsp to mL is 19.72 mL. In everyday recipe math, that is often rounded to 20 mL.
This is a useful conversion when a recipe combines 1 tablespoon with 1 extra teaspoon.
2.5 tsp to mL
2.5 tsp to mL is 12.32 mL, which is commonly rounded to 12.5 mL.
This amount appears in scaled recipes, sauces, dressings, and other small-batch cooking measurements.
How tsp to mL Conversion Works
To convert tsp to mL, multiply the number of teaspoons by the number of milliliters in 1 US teaspoon:
mL = tsp × 4.92892
To convert the other way, divide milliliters by 4.92892:
tsp = mL ÷ 4.92892
For quick cooking math, many people round 1 tsp to 5 mL. That shortcut is usually close enough for everyday kitchen use, while the exact US teaspoon conversion is better when you want more precision.
Common Teaspoon to Milliliter Reference Table
| Teaspoons | Exact mL (US tsp) | Quick Kitchen Round | Common Equivalent |
|---|---|---|---|
| 1/8 tsp | 0.62 mL | 0.63 mL | Half of 1/4 tsp |
| 1/4 tsp | 1.23 mL | 1.25 mL | Half of 1/2 tsp |
| 1/2 tsp | 2.46 mL | 2.5 mL | Half of 1 tsp |
| 3/4 tsp | 3.70 mL | 3.75 mL | 1/2 tsp + 1/4 tsp |
| 1 tsp | 4.93 mL | 5 mL | 1/3 tbsp |
| 1.5 tsp | 7.39 mL | 7.5 mL | 1/2 tbsp |
| 2 tsp | 9.86 mL | 10 mL | 2/3 tbsp |
| 2.5 tsp | 12.32 mL | 12.5 mL | 2 tsp + 1/2 tsp |
| 3 tsp | 14.79 mL | 15 mL | 1 tbsp |
| 4 tsp | 19.72 mL | 20 mL | 1 tbsp + 1 tsp |
Why tsp to mL Answers Can Differ Slightly
If you search for tsp to mL, you may see both 1 tsp = 4.93 mL and 1 tsp = 5 mL. That happens because a US teaspoon is about 4.92892 mL, while many kitchen charts and metric measuring systems round a teaspoon to 5 mL.
For most home cooking, the difference is small. But in precise baking, candy making, or scaled recipes, using the exact teaspoon-to-milliliter conversion can help you stay more consistent.
Better Measuring Tips
- Use 1 tsp = 4.92892 mL when you want the exact US teaspoon conversion.
- Use 1 tsp ≈ 5 mL for quick kitchen estimates.
- Remember that 3 tsp = 1 tbsp ≈ 15 mL, which is one of the most useful kitchen benchmarks.
- Level dry ingredients in measuring spoons instead of heaping them.
- For very small mL amounts, use a measuring syringe or marked liquid spoon for better accuracy.
- When scaling recipes, round only at the end to keep your totals more accurate.
Use this page whenever you need a quick and accurate tsp to mL conversion, whether you are converting 1 tsp to mL, 1/2 tsp to mL, 3 tsp to mL, or any other common teaspoon measurement.