A US teaspoon is one third of a US tablespoon.
Teaspoons to Metric tablespoons Converter — tsp to metric tbsp
Convert Teaspoon (tsp) to Metric tablespoon (metric tbsp) using the exact conversion factor (1 teaspoon = 0.3285947729 metric tablespoon). See the formula, worked examples, conversion table, and common uses.
Teaspoons to Metric tablespoons converter
Converter
Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
A metric tablespoon is 15 milliliters.
Result = input x 4.92892159e-6 / 1.5e-5.
Volume units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Teaspoons to Metric tablespoons
Teaspoon and Metric tablespoon both show up in recipes, and converting between them matters whenever a recipe from one country's cookbook needs to be followed with another country's measuring tools. Teaspoon is most often used for us recipe and cooking measurement for small quantities.
Formula
metric tablespoons = teaspoons × 0.328594772917
This factor comes from each unit's defined relationship to the category's base unit: 1 teaspoon equals 0.00000492892159375 base units, and 1 metric tablespoon equals 0.000015 base units, so dividing one by the other gives the direct teaspoon-to-metric tablespoon factor of 0.328594772917.
Simple example
1 tsp × 0.3285947729 = 0.3285947729 metric tbsp
1 teaspoon = 0.3285947729 metric tablespoons.
Real-world example
2 tsp × 0.3285947729 = 0.6571895458 metric tbsp
2 teaspoons = 0.6571895458 metric tablespoons.
Conversion table
| Teaspoon (tsp) | Metric tablespoon (metric tbsp) |
|---|---|
| 0.25 tsp | 0.0821486932 metric tbsp |
| 0.5 tsp | 0.1642973865 metric tbsp |
| 1 tsp | 0.3285947729 metric tbsp |
| 2 tsp | 0.6571895458 metric tbsp |
| 4 tsp | 1.314379092 metric tbsp |
| 8 tsp | 2.628758183 metric tbsp |
Reverse conversion: Metric tablespoon to Teaspoon
0.3285947729 metric tbsp × 3.043262043 = 0.9999999999 tsp
0.3285947729 metric tablespoons = 0.9999999999 teaspoons.
teaspoons = metric tablespoons × 3.04326204317
For a page dedicated to this direction, see Metric tablespoon to Teaspoon.
Understanding the Teaspoon
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Where it's used: United States (cooking and recipe measurement)
Uses of the Teaspoon today
- US recipe and cooking measurement for small quantities
- Medication dosing instructions in the US
- Baking measurement alongside the tablespoon and cup
Understanding the Metric tablespoon (metric tbsp)
A metric tablespoon is 15 milliliters.
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many metric tablespoons are in 1 teaspoon?
1 teaspoon equals 0.3285947729 metric tablespoons, using the exact defined conversion factor rather than an estimate.
How do I convert teaspoon to metric tablespoon?
Multiply the teaspoon value by 0.3285947729. The converter above does this instantly to whatever precision you set.
How do I convert metric tablespoon back to teaspoon?
Use the reverse factor: 1 metric tablespoon equals 3.043262043 teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a teaspoon?
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
What is a metric tablespoon?
Metric tablespoon (metric tbsp) is a unit of cooking.
Is the teaspoon to metric tablespoon conversion exact?
Yes. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the teaspoon still used today?
United States (cooking and recipe measurement)