Convert tsp to ml
Convert tsp to ml instantly. 1 tsp = 4.928922 ml. Formula, worked examples and a quick reference table.
Last updated
One us teaspoon equals 4.928922 milliliters. To convert any number of us teaspoons to milliliters, multiply by 4.92892159.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Volume is the category where the US and imperial systems diverge most damagingly. Gallons, quarts, pints and fluid ounces all exist in two sizes that differ by up to 20%, and nothing in the name warns you which one a figure uses. Recipes, fuel economy figures and container capacities all cross borders regularly, so it is worth checking which system a source is using before converting rather than after.
tsp to ml formula
To go the other way, use us teaspoon = milliliter ÷ 4.92892159.
About these units
A US teaspoon is 4.93 millilitres, rounded to 5 ml almost everywhere in practice. Australian tablespoons are the outlier at 20 ml rather than 15.
A millilitre is exactly one cubic centimetre. Because one millilitre of water weighs one gram, the unit doubles as a rough mass measure in the kitchen.
US Teaspoon is also written teaspoons and tsps. Milliliter is also written millilitre, millilitres, milliliters and cc.
Sources
tsp to ml conversion table
| US Teaspoon | Milliliter |
|---|---|
| 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 |
| 20 tsp | 98.5784 ml |
| 25 tsp | 123.223 ml |
| 50 tsp | 246.4461 ml |
| 100 tsp | 492.8922 ml |
| 250 tsp | 1,232.2304 ml |
| 500 tsp | 2,464.4608 ml |
| 1,000 tsp | 4,928.9216 ml |
Frequently asked questions
How many milliliters are in a us teaspoon? +
There are 4.928922 milliliters in one us teaspoon.
What is 10 tsp in ml? +
10 tsp equals 49.2892 ml. Multiply 10 by 4.92892159.
How do I convert milliliter back to us teaspoon? +
Use us teaspoon = milliliter ÷ 4.92892159. The converter above handles both directions, or see our dedicated ml to tsp page.
How accurate is this us teaspoon to milliliter conversion? +
The factor used is 4.9289215938, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate tsp to ml in my head? +
Multiply by 44 and divide by 9. That approximates the true factor of 4.928922 to within 0.8122%, which is close enough for a mental estimate.