How to convert US tablespoons to US teaspoons
One US tablespoon equals 3 US teaspoons, so multiply the number of US tablespoons by 3:
tsp = tbsp × 3
tbsp = tsp ÷ 3 (1 tsp = 0.333333 tbsp)
Example: 0.5 tbsp → 0.5 × 3 = 1.5 tsp.
Going the other way, divide by 3, or multiply by 0.333333.
Everyday values
| US tablespoons | US teaspoons | For example |
|---|---|---|
| 0.5 tbsp | 1.5 tsp | half a tablespoon |
| 1 tbsp | 3 tsp | one tablespoon |
| 2 tbsp | 6 tsp | two tablespoons |
| 4 tbsp | 12 tsp | a quarter cup |
When you need this conversion
One tablespoon equals three teaspoons in US, UK and metric measures alike. Halving a recipe that calls for 1 tablespoon? Use 1½ teaspoons.
US tablespoon to US teaspoon conversion table
| tbsp | tsp | tbsp | tsp |
|---|---|---|---|
| 0.5 tbsp | 1.5 tsp | 5.5 tbsp | 16.5 tsp |
| 1 tbsp | 3 tsp | 6 tbsp | 18 tsp |
| 1.5 tbsp | 4.5 tsp | 6.5 tbsp | 19.5 tsp |
| 2 tbsp | 6 tsp | 7 tbsp | 21 tsp |
| 2.5 tbsp | 7.5 tsp | 7.5 tbsp | 22.5 tsp |
| 3 tbsp | 9 tsp | 8 tbsp | 24 tsp |
| 3.5 tbsp | 10.5 tsp | 8.5 tbsp | 25.5 tsp |
| 4 tbsp | 12 tsp | 9 tbsp | 27 tsp |
| 4.5 tbsp | 13.5 tsp | 9.5 tbsp | 28.5 tsp |
| 5 tbsp | 15 tsp | 10 tbsp | 30 tsp |
About the units
- US tablespoon (tbsp): 1/2 US fluid ounce, about 14.79 millilitres.
- US teaspoon (tsp): 1/3 US tablespoon, about 4.93 millilitres.
Both are units of volume. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many US teaspoons are in one US tablespoon?
One US tablespoon is 3 US teaspoons. One US teaspoon is 0.333333 US tablespoons.
How do I convert US tablespoons to US teaspoons?
Multiply the value in US tablespoons by 3. To go back, divide by 3.
What is 0.5 tbsp in US teaspoons?
0.5 tbsp = 1.5 tsp.
What is 2 tbsp in US teaspoons?
2 tbsp = 6 tsp.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.