Convert US Tablespoon to US Teaspoon
Convert us tablespoons to us teaspoons instantly. 1 us tablespoon = 3 us teaspoon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Teaspoon to US Tablespoon converter for the reverse conversion.
Units explained
US Tablespoon
A US tablespoon is half a US fluid ounce (14.7868 mL).
A standardized cooking measure equal to three teaspoons.
Universal in US recipes for liquids and condiments.
US cooking measure.
US Teaspoon
A US teaspoon is one third of a US tablespoon (4.9289 mL).
A standardized small cooking measure.
Used everywhere in US recipes and home dosing.
US cooking measure.
US Tablespoon to US Teaspoon conversion formula
The relationship between us tablespoons and us teaspoons:
To convert us tablespoons to us teaspoons, multiply the value in us tablespoons by 3. To reverse, multiply us teaspoons by 0.3333333333.
How to use this converter
Type a value into the calculator. The result in us teaspoons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Teaspoon to US Tablespoon converter for the reverse direction.
Step-by-step: convert us tablespoons to us teaspoons
- Write down the value in us tablespoons (tbsp).
- Multiply that value by the factor 3.
- The product is the equivalent value in us teaspoons (tsp).
- To reverse, multiply the us teaspoon value by 0.3333333333.
Worked examples
Example 1 — Convert 1 tbsp to tsp:
1 × 3 = 3 tsp
Example 2 — Convert 100 tbsp to tsp:
100 × 3 = 300 tsp
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 us tablespoons), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 tbsp × 3 = 9 tsp
Real-world example — Plastic-film thickness alternates
A 150-us tablespoon plastic film converts cleanly to us teaspoons — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 tbsp × 3 = 450 tsp
Real-world example — Hair-width scale measurements
A 70-us tablespoon measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like us teaspoons for direct comparison across supplier datasheets.
70 tbsp × 3 = 210 tsp
US Tablespoon to US Teaspoon conversion table
Standard reference values for converting us tablespoons to us teaspoons:
| US Tablespoon [tbsp] | US Teaspoon [tsp] |
|---|---|
| 0.01 | 0.03 |
| 0.1 | 0.3 |
| 1 | 3 |
| 2 | 6 |
| 3 | 9 |
| 4 | 12 |
| 5 | 15 |
| 10 | 30 |
| 20 | 60 |
| 30 | 90 |
| 40 | 120 |
| 50 | 150 |
| 100 | 300 |
| 500 | 1500 |
| 1000 | 3000 |
Frequently asked questions
How many us teaspoons is 1 us tablespoon?
How do I convert us tablespoons to us teaspoons?
How do I convert us teaspoons back to us tablespoons?
How many us teaspoons is 100 us tablespoons?
Popular volume unit conversions
Convert US Tablespoon to other volume units
Show all US Tablespoon conversions
Metric / SI (8 units)
US Customary (Liquid) (7 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 tbsp = 3 tsp) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.