Convert teaspoons to milliliters (tsp to mL) instantly. Exact NIST scientific conversion for US and metric teaspoon measurements.
mL = teaspoons × 4.92892Instant conversions for standard culinary and measurement values.
| Teaspoons (tsp) | Milliliters (mL) | Notes / Equivalents |
|---|---|---|
| 0.125 tsp | 0.616 mL | 1/8 tsp (dash / pinch) |
| 0.25 tsp | 1.232 mL | 1/4 tsp |
| 0.5 tsp | 2.464 mL | 1/2 tsp |
| 0.75 tsp | 3.697 mL | 3/4 tsp |
| 1 tsp | 4.929 mL | 1 standard US teaspoon |
| 1.5 tsp | 7.393 mL | 1 1/2 tsp |
| 2 tsp | 9.858 mL | 2 tsp |
| 3 tsp | 14.787 mL | 3 tsp = 1 US tablespoon |
| 4 tsp | 19.716 mL | 4 tsp |
| 5 tsp | 24.645 mL | 5 tsp |
| 6 tsp | 29.574 mL | 6 tsp = 1 US fluid ounce |
Conversion between teaspoons and milliliters is governed by precise mathematical and physical standards.
Because both units belong to the same dimensional category (volume), this conversion uses a fixed mathematical ratio that never changes regardless of ingredient temperature or density.
Direct (tsp to mL):
mL = teaspoons × 4.92892Reverse (mL to tsp):
teaspoons = mL / 4.92892The US customary teaspoon is legally defined as exactly 1/6 of a US fluid ounce or 4.92892159375 milliliters.
In Australia, Canada, the UK, and New Zealand, the metric teaspoon is rounded to exactly 5.000 mL.
Because both teaspoons and milliliters measure volume, this conversion applies universally to every liquid or powder without needing density.
1 tablespoon equals exactly 3 teaspoons (14.79 mL), and 1 fluid ounce equals 6 teaspoons (29.57 mL).
There are exactly 4.92892 mL in 1 US customary teaspoon (commonly rounded to 4.93 mL). In metric cooking systems, 1 metric teaspoon is exactly 5.0 mL.
A 1/2 US teaspoon equals approximately 2.464 mL (or 2.5 mL in the metric system).
A 1/4 US teaspoon equals approximately 1.232 mL (or 1.25 mL metric).
Five milliliters equals 1.014 US teaspoons (practically 1 teaspoon). In medical dosage, 5 mL is universally treated as the metric teaspoon standard.
10 mL equals approximately 2.03 US teaspoons. 15 mL equals approximately 3.04 US teaspoons (or 1 standard tablespoon).