# US tablespoons to US teaspoons converter

> Convert US tablespoons to US teaspoons (tbsp to tsp) with the exact factor, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/tablespoons-to-teaspoons
Subject: Unit converters

Tablespoon amounts often describe dressings, oils or a scaled recipe. A US tablespoon and an Australian tablespoon are different measures. Choose the convention in the source recipe and use level measuring spoons; a heaped spoon has no fixed volume.

One US tablespoon is exactly 3 US teaspoons, so 2 tbsp is 6 tsp. To convert tbsp to tsp, multiply by 3; to convert back, multiply by 0.3333333333.

The US tablespoon is half a fluid ounce, exactly 14.78676478125 mL. Because both units are defined exactly, the factor above is exact and the results here carry no conversion error.

## Inputs

- **US tablespoons (tbsp)**

## Results

- US teaspoons (tsp) — main result
- Conversion
- 1 tsp in US tablespoons (tbsp)

## Formula

$$
\text{US teaspoons} = \text{US tablespoons} \times 3
$$

## Worked examples

### 2 tbsp to tsp

- US tablespoons (tbsp): 2 tbsp
- **US teaspoons: 6 tsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 6 tbsp to tsp

- US tablespoons (tbsp): 6 tbsp
- **US teaspoons: 18 tsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 0.5 tbsp to tsp

- US tablespoons (tbsp): 0.5 tbsp
- **US teaspoons: 1.5 tsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert tbsp to tsp?

Tablespoon amounts often describe dressings, oils or a scaled recipe. A US tablespoon and an Australian tablespoon are different measures. Choose the convention in the source recipe and use level measuring spoons; a heaped spoon has no fixed volume.

### How many US teaspoons are in a US tablespoon?

One US tablespoon is exactly 3 US teaspoons. The US tablespoon is half a fluid ounce, exactly 14.78676478125 mL.

### How do you convert tbsp to tsp?

Multiply the number of US tablespoons by 3. For example, 2 tbsp × 3 = 6 tsp. To go the other way, divide by 3.

### How accurate is the US tablespoons to US teaspoons converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “2 tbsp to tsp” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)