US Teaspoons to Milliliters (tsp to mL)
1 tsp = 4.92892 mL
and 1 mL = 0.202884 tsp
How to convert US Teaspoons to Milliliters
mL = tsp × 4.92892
To convert, multiply the number of US teaspoons by 4.92892. Example: 10 tsp × 4.92892 = 49.2892 mL.
1 US teaspoon is 1/6 US fl oz = 4.92892159375 mL.
Common for baking ingredients like salt, baking soda and vanilla, and for medicine doses (where a teaspoon is taken as 5 mL).
Mental shortcut: multiply by 5 (overestimates by about 1.4%).
US Teaspoons to Milliliters conversion chart
| US Teaspoons | Milliliters |
|---|---|
| 1/8 tsp | 0.6161 mL |
| 1/4 tsp | 1.23 mL |
| 1/2 tsp | 2.46 mL |
| 3/4 tsp | 3.7 mL |
| 1 tsp | 4.93 mL |
| 2 tsp | 9.86 mL |
| 3 tsp | 14.79 mL |
| 4 tsp | 19.72 mL |
| 5 tsp | 24.64 mL |
| 6 tsp | 29.57 mL |
| 7 tsp | 34.5 mL |
| 8 tsp | 39.43 mL |
| 9 tsp | 44.36 mL |
| 10 tsp | 49.29 mL |
| 11 tsp | 54.22 mL |
| 12 tsp | 59.15 mL |
Values rounded to 2 decimal places (4 below 1). Use the converter above for more precision.
Frequently asked questions
How many milliliters are in 1 US teaspoon?
1 US teaspoon = 4.92892 milliliters. 1 US teaspoon is 1/6 US fl oz = 4.92892159375 mL.
How do I convert US teaspoons to milliliters?
Multiply the number of US teaspoons by 4.92892. Example: 10 tsp × 4.92892 = 49.2892 mL.
Is there a quick way to estimate tsp to mL in your head?
Yes — multiply by 5. This overestimates by about 1.4%. Use the exact formula (mL = tsp × 4.92892) when precision matters.