Convert US Tablespoon to Metric Teaspoon
Convert us tablespoons to metric teaspoons instantly. 1 us tablespoon = 2.9573529562 metric teaspoon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Metric 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.
Metric Teaspoon
A metric teaspoon is exactly 5 milliliters.
Adopted as the standard metric small cooking measure.
Universal in metric recipes and liquid medicine dosing.
Metrication.
US Tablespoon to Metric Teaspoon conversion formula
The relationship between us tablespoons and metric teaspoons:
To convert us tablespoons to metric teaspoons, multiply the value in us tablespoons by 2.9573529562. To reverse, multiply metric teaspoons by 0.338140227.
How to use this converter
Type a value into the calculator. The result in metric 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 Metric Teaspoon to US Tablespoon converter for the reverse direction.
Step-by-step: convert us tablespoons to metric teaspoons
- Write down the value in us tablespoons (tbsp).
- Multiply that value by the factor 2.9573529562.
- The product is the equivalent value in metric teaspoons (tsp).
- To reverse, multiply the metric teaspoon value by 0.338140227.
Worked examples
Example 1 — Convert 1 tbsp to tsp:
1 × 2.9573529562 = 2.9573529562 tsp
Example 2 — Convert 100 tbsp to tsp:
100 × 2.9573529562 = 295.735295625 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 × 2.9573529562 = 8.8720588687 tsp
Real-world example — Plastic-film thickness alternates
A 150-us tablespoon plastic film converts cleanly to metric teaspoons — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 tbsp × 2.9573529562 = 443.6029434375 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 metric teaspoons for direct comparison across supplier datasheets.
70 tbsp × 2.9573529562 = 207.0147069375 tsp
US Tablespoon to Metric Teaspoon conversion table
Standard reference values for converting us tablespoons to metric teaspoons:
| US Tablespoon [tbsp] | Metric Teaspoon [tsp] |
|---|---|
| 0.01 | 0.0295735296 |
| 0.1 | 0.2957352956 |
| 1 | 2.9573529562 |
| 2 | 5.9147059125 |
| 3 | 8.8720588687 |
| 4 | 11.829411825 |
| 5 | 14.7867647812 |
| 10 | 29.5735295625 |
| 20 | 59.147059125 |
| 30 | 88.7205886875 |
| 40 | 118.29411825 |
| 50 | 147.8676478125 |
| 100 | 295.735295625 |
| 500 | 1478.676478125 |
| 1000 | 2957.35295625 |
Frequently asked questions
How many metric teaspoons is 1 us tablespoon?
How do I convert us tablespoons to metric teaspoons?
How do I convert metric teaspoons back to us tablespoons?
How many metric teaspoons is 100 us tablespoons?
Popular volume unit conversions
Convert US Tablespoon to other volume units
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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 = 2.9573529562 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.