# How do I convert tsp to tbsp?

Converts teaspoons (tsp) to tablespoons (tbsp) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/teaspoons-to-tablespoons
- JSON spec: https://www.acalculator.org/convert/teaspoons-to-tablespoons.json
- Version: 46b13a60330c

## Default answer

Example with the default inputs (Teaspoons (tsp) 1): 1 tsp = 0.333333 tbsp.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Teaspoons (tsp) | The amount in teaspoons to convert. |
| result | Tablespoons (tbsp) | The same amount in tablespoons. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Teaspoons (tsp) | The amount in teaspoons to convert. |
| result | Tablespoons (tbsp) | The amount in tablespoons. |

## Method

tbsp = tsp × 0.333333333333 (the same as tsp ÷ 3)

## Assumptions

- 1 teaspoon = 0.333333333333 tablespoons, from the exact definitions in NIST SP 811.
- Cups, ounces, tablespoons, teaspoons, pints, quarts, and gallons are US customary units: 1 US cup is 8 US fluid ounces.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up.

## Worked examples

1. value = 1 gives result = 0.333333. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 3 gives result = 1. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 1 gives value = 3. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many tablespoons are in a teaspoon?

1 teaspoon is 0.333333 tablespoons, from the exact unit definitions (NIST SP 811).

### How do I convert teaspoons to tablespoons?

Multiply by 0.333333: tbsp = tsp × 0.333333333333 (the same as tsp ÷ 3). For example, 1 tsp × 0.333333 = 0.333333 tbsp.

### How do I convert tablespoons back to teaspoons?

Multiply by 3, or type the tablespoons into the second box and the converter works it out. 1 tablespoon is 3 teaspoons.

### How many teaspoons are in a tablespoon?

3. A US tablespoon is 1/2 US fluid ounce and a teaspoon is 1/6 fluid ounce, so 1 tbsp = 3 tsp. In metric kitchens a tablespoon is 15 mL and a teaspoon 5 mL (NIST), the same 3 to 1.

### How many tablespoons is 2 teaspoons?

2 ÷ 3 = 0.666667 tbsp, or 2/3 of a tablespoon. For 1 teaspoon it is 1/3 tbsp.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8. https://www.nist.gov/pml/special-publication-811
- NIST Office of Weights and Measures, Metric Kitchen: Cooking Measurement Equivalencies (1 teaspoon = 5 mL, 1 tablespoon = 15 mL), retrieved 2026-10-01. https://www.nist.gov/pml/owm/metric-kitchen-cooking-measurement-equivalencies