Reference table
| mL | US tsp (tsp) | metric tsp (tsp) | imperial tsp (tsp) |
|---|---|---|---|
| 1.00 | 0.203 | 0.200 | 0.169 |
| 2.50 | 0.507 | 0.500 | 0.422 |
| 5.00 | 1.014 | 1.000 | 0.845 |
| 10.00 | 2.029 | 2.000 | 1.689 |
| 15.00 | 3.043 | 3.000 | 2.534 |
Tip: Many recipes assume metric teaspoons (5 mL). Nutrition labels in some regions also use 5 mL as the legal teaspoon.
Formula and notes
mL → tsp: tsp = mL ÷ mL_per_tsp. tsp → mL: mL = tsp × mL_per_tsp.
- US customary teaspoon: 1 tsp = 4.92892159375 mL
- Metric teaspoon: 1 tsp = 5 mL
- Imperial teaspoon: 1 tsp = 5.919388020833333 mL
- Cooking fractions are often measured in eighths or quarters of a teaspoon. Use rounding to nearest 1/8 or 1/4 tsp for practical outputs.
FAQs
Most modern cookbooks assume the metric teaspoon of 5 mL. US home measuring spoons can be close to 5 mL too, while historical UK sources may refer to the larger imperial teaspoon.
Choose decimals for scientific style outputs or fractions for kitchen friendly numbers. Nearest 1/8 or 1/4 tsp approximations are common when measuring with spoons.
The imperial teaspoon is part of the old UK imperial system where base units differ from US customary and from the modern metric standard used in most measuring spoons.
Yes. Use the tsp → mL tab. Enter the number of teaspoons and the tool multiplies by the selected mL per teaspoon to give milliliters.
For scientific contexts use the exact US conversion and set decimals to at least 4–6 places. For everyday cooking 1–2 decimals or 1/8 tsp rounding is typically sufficient.
Yes. Use the Bulk list tab to paste many milliliter values. The table shows teaspoon results and approximate fractions for quick recipe scaling.
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