This converter turns teaspoons into milliliters instantly, using the exact factor 1 teaspoon = 4.928921594 milliliters. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The smallest standard kitchen measure, 4.93 millilitres. One thousandth of a litre, equal to one cubic centimetre.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
teaspoons- The amount you are converting, measured in teaspoons
4.928921594- The exact number of milliliters in one teaspoon
milliliters- The converted result
How it works, step by step
- Enter the number of teaspoons you want to convert.
- The value is multiplied by 4.928921594, the exact conversion factor.
- The result is displayed in milliliters, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 teaspoons
Multiply 5 by 4.9289216. That gives 24.6446 milliliters. A quick sanity check: one teaspoon is larger than one milliliter, so the number should get bigger — and it does.
Converting 72 teaspoons
72 × 4.9289216 = 354.8824 milliliters. Working backwards, 354.8824 ÷ 4.9289216 returns 72 teaspoons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many milliliters are in one teaspoon?
Exactly 4.928921594. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert teaspoons to milliliters?
Milliliters = teaspoons × 4.928921594. To reverse it, divide instead: teaspoons = milliliters ÷ 4.928921594, which is the same as multiplying by 0.2028841362.
Is the teaspoon bigger than the milliliter?
Yes. One teaspoon equals 4.92892 milliliters, so it is the larger unit.
Why does my answer differ slightly from other teaspoons to ml converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a teaspoon?
The smallest standard kitchen measure, 4.93 millilitres.
What is a milliliter?
One thousandth of a litre, equal to one cubic centimetre.
Teaspoons to milliliters reference table
| Teaspoons | Milliliters |
|---|---|
| 0.5 tsp | 2.4645 mL |
| 1 tsp | 4.9289 mL |
| 2 tsp | 9.8578 mL |
| 3 tsp | 14.7868 mL |
| 5 tsp | 24.6446 mL |
| 10 tsp | 49.2892 mL |
| 15 tsp | 73.9338 mL |
| 20 tsp | 98.5784 mL |
| 25 tsp | 123.223 mL |
| 50 tsp | 246.4461 mL |
| 75 tsp | 369.6691 mL |
| 100 tsp | 492.8922 mL |
| 250 tsp | 1,232.23 mL |
| 500 tsp | 2,464.46 mL |
| 1000 tsp | 4,928.92 mL |
Exact factor: 1 teaspoon = 4.928921594 milliliters. Values rounded for display.