# US teaspoons to US tablespoons converter

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

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

Teaspoon quantities are useful when a recipe calls for a small amount and only a larger measure is available. Enter fractions precisely and check the US measuring-spoon convention. Ordinary cutlery is not a calibrated measuring tool.

One US teaspoon is about 0.3333333333 US tablespoons, so 3 tsp is 1 tbsp. To convert tsp to tbsp, multiply by 0.3333333333; to convert back, multiply by 3.

The US teaspoon is a third of a tablespoon, exactly 4.92892159375 mL. The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.

## Inputs

- **US teaspoons (tsp)**

## Results

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

## Formula

$$
\text{US tablespoons} = \text{US teaspoons} \times 0.333333333333
$$

## Worked examples

### 3 tsp to tbsp

- US teaspoons (tsp): 3 tsp
- **US tablespoons: 1 tbsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 9 tsp to tbsp

- US teaspoons (tsp): 9 tsp
- **US tablespoons: 3 tbsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 1 tsp to tbsp

- US teaspoons (tsp): 1 tsp
- **US tablespoons: 0.3333333333 tbsp**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert tsp to tbsp?

Teaspoon quantities are useful when a recipe calls for a small amount and only a larger measure is available. Enter fractions precisely and check the US measuring-spoon convention. Ordinary cutlery is not a calibrated measuring tool.

### How many US tablespoons are in a US teaspoon?

One US teaspoon is about 0.3333333333 US tablespoons. The US teaspoon is a third of a tablespoon, exactly 4.92892159375 mL.

### How do you convert tsp to tbsp?

Multiply the number of US teaspoons by 0.3333333333. For example, 3 tsp × 0.3333333333 = 1 tbsp. To go the other way, divide by 0.3333333333.

### How can I estimate tsp to tbsp without a calculator?

Multiply by 0.33. That is 1% low of the exact factor 0.3333333333, so 3 tsp comes out as 0.99 tbsp instead of 1.

### How accurate is the US teaspoons to US tablespoons 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, “3 tsp to tbsp” 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)