Teaspoons to milliliters
1 teaspoon = 4.93 milliliters
For any other value: ml = tsp × 4.9289215938
Calculator
4.93 ml
Type a number — fractions like 3/8 or 1 1/2 work too.
You can leave the unit in: 100 tsp is fine.
Teaspoons to milliliters chart
The values people look up most.
| teaspoons | US teaspoons | Metric |
|---|---|---|
| 1 tsp | 4.93 ml | 5 ml |
| 2 tsp | 9.86 ml | 10 ml |
| 3 tsp | 14.79 ml | 15 ml |
| 4 tsp | 19.72 ml | 20 ml |
| 5 tsp | 24.64 ml | 25 ml |
| 6 tsp | 29.57 ml | 30 ml |
| 7 tsp | 34.5 ml | 35 ml |
| 8 tsp | 39.43 ml | 40 ml |
| 10 tsp | 49.29 ml | 50 ml |
| 12 tsp | 59.15 ml | 60 ml |
| 16 tsp | 78.86 ml | 80 ml |
| 24 tsp | 118.29 ml | 120 ml |
| 1/2 tsp | 2.46 ml | 2.5 ml |
| 1/4 tsp | 1.23 ml | 1.25 ml |
| 3/4 tsp | 3.7 ml | 3.75 ml |
| 1/8 tsp | 0.616 ml | 0.625 ml |
| 1/3 tsp | 1.64 ml | 1.67 ml |
| 2/3 tsp | 3.29 ml | 3.33 ml |
| 1 1/2 tsp | 7.39 ml | 7.5 ml |
Formula
ml = tsp × 4.9289215938
US or metric teaspoons?
A US teaspoon is 4.93 ml and a metric one is exactly 5 ml. This page uses US, which is what most recipes online mean. The chart shows both.
Recipes online almost always mean the US teaspoon of 4.93 ml. On US medicine and nutrition labels a teaspoon is rounded to exactly 5 ml (21 CFR 101.9), the same as a metric teaspoon, so both are here to check.
Where this number comes from
This factor is exact, not rounded. NIST lists the US teaspoon as 4.92892159375 ml — exactly 1/768 of a US gallon (3.785411784 L).
Source: NIST Guide to the SI, Appendix B: Conversion Factors, NIST (National Institute of Standards and Technology, USA).
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