US teaspoon to Milliliter Converter
1 tsp = 4.928922 ml — convert instantly with formula and table.
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Quick answer: one us teaspoon equals 4.9289 milliliters. So to convert US teaspoons to milliliters, multiply by 4.92892159.
How to convert US teaspoons to milliliters
milliliters = US teaspoons × 4.9289215938
The US teaspoon is defined as exactly 4.92892159375 ml — one third of a tablespoon — and anchors small quantities in American recipes.
The milliliter — one cubic centimeter — is the metric unit of medicine doses, beverage cans and recipe liquids.
US teaspoon to Milliliter conversion table
| US teaspoon (tsp) | Milliliter (ml) |
|---|---|
| 0.01 tsp | 0.049289 ml |
| 0.1 tsp | 0.492892 ml |
| 0.25 tsp | 1.2322 ml |
| 0.4 tsp | 1.9716 ml |
| 0.75 tsp | 3.6967 ml |
| 1.25 tsp | 6.1612 ml |
| 1.75 tsp | 8.6256 ml |
| 2.5 tsp | 12.3223 ml |
| 3.5 tsp | 17.2512 ml |
| 4.5 tsp | 22.1801 ml |
| 6 tsp | 29.5735 ml |
| 8 tsp | 39.4314 ml |
| 10 tsp | 49.2892 ml |
| 12 tsp | 59.1471 ml |
| 14 tsp | 69.0049 ml |
| 16 tsp | 78.8627 ml |
| 18 tsp | 88.7206 ml |
| 20 tsp | 98.5784 ml |
| 24 tsp | 118.2941 ml |
| 26 tsp | 128.152 ml |
| 30 tsp | 147.8676 ml |
| 35 tsp | 172.5123 ml |
| 45 tsp | 221.8015 ml |
| 55 tsp | 271.0907 ml |
| 65 tsp | 320.3799 ml |
| 75 tsp | 369.6691 ml |
| 85 tsp | 418.9583 ml |
| 95 tsp | 468.2476 ml |
| 110 tsp | 542.1814 ml |
| 125 tsp | 616.1152 ml |
| 175 tsp | 862.5613 ml |
| 250 tsp | 1,232.23 ml |
| 350 tsp | 1,725.12 ml |
| 450 tsp | 2,218.01 ml |
| 600 tsp | 2,957.35 ml |
| 750 tsp | 3,696.69 ml |
| 900 tsp | 4,436.03 ml |
| 1,500 tsp | 7,393.38 ml |
| 2,500 tsp | 12,322.3 ml |
| 10,000 tsp | 49,289.22 ml |
Need the opposite direction? Use the Milliliter to US teaspoon converter, or read our complete guide to volume conversions for every formula in one place.
Frequently asked questions
How many milliliters are in one us teaspoon?
One us teaspoon equals 4.9289 milliliters. Multiply any us teaspoon value by 4.92892159 to get milliliters.
What is 10 US teaspoons in milliliters?
10 US teaspoons equal 49.2892 milliliters (10 × 4.928922).
Is the us teaspoon to milliliter conversion exact?
The conversion factor used here (4.9289215938) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.
Is my data stored when I use this converter?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.