Tsp to Tablespoon: Convert Teaspoons to Tablespoons
Convert tsp to tablespoon: one US teaspoon equals 0.333 tablespoon (one third). Learn the exact ratio and common teaspoon-to-tablespoon values.
Why Teaspoons to Tablespoons Comes Up
Recipes and medicine doses often list teaspoons, but you may want a tablespoon measure for speed. The fixed ratio lets you switch without re-weighing.
One US teaspoon equals one third of a tablespoon (about 0.333 tbsp). Our teaspoon converter gives the milliliter value, and the tbsp ratio is fixed.
The Tsp to Tablespoon Formula
Since 1 tablespoon equals 3 teaspoons, divide teaspoons by 3 to get tablespoons.
The Exact Calculation
For 1 tsp: 1 / 3 = 0.333 tbsp. For 3 tsp: 3 / 3 = 1 tbsp. For 6 tsp: 6 / 3 = 2 tbsp. The ratio is exact by US definition.
In milliliters, 1 tsp is about 4.93 ml and 1 tbsp is about 14.79 ml, and 14.79 / 4.93 = 3, confirming that 3 tsp make 1 tbsp.
The Metric Exception
The Australian metric tablespoon is 20 ml and the metric teaspoon is 5 ml, so there 4 tsp make 1 tbsp. The 3-to-1 ratio is for US and UK spoons.
What the Numbers Look Like
A dose of 1 tsp is 0.333 tbsp; 2 tsp is 0.667 tbsp; 3 tsp is exactly 1 tbsp. Baking soda or spice amounts in tsp convert cleanly this way.
For the milliliter value of a tablespoon, our guide to tablespoons to ml covers the metric side.
Tsp to Tablespoon Compared With Nearby Values
Reference points: 1 tsp = 0.333 tbsp, 2 tsp = 0.667 tbsp, 9 tsp = 3 tbsp. Each 3 teaspoons add exactly 1 tablespoon.
The reverse, tbsp to tsp, multiplies by 3, so 1 tbsp = 3 tsp and 2 tbsp = 6 tsp.
When You Need Tsp in Tablespoons
The conversion matters when scaling or substituting measures. If a recipe uses 6 tsp of an ingredient and you prefer a tablespoon, that is 2 tbsp.
It also helps when following a dose given in teaspoons but using a tablespoon tool, keeping the amount accurate.
Frequently Asked Questions
How many tbsp is 1 tsp?
1 US teaspoon equals one third of a tablespoon, about 0.333 tbsp.
How do I convert tsp to tbsp?
Divide teaspoons by 3. For 6 tsp: 6 / 3 = 2 tbsp.
Is a teaspoon one third of a tablespoon?
Yes, in the US and UK. Three teaspoons make one tablespoon.
How many tbsp is 3 tsp?
3 teaspoons equal exactly 1 tablespoon.
How many ml is a teaspoon?
A US teaspoon is about 4.93 ml, and a tablespoon is about 14.79 ml.
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Teaspoons to mL Converter
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Quick Summary
1 US teaspoon equals 0.333 tablespoon (one third). Divide teaspoons by 3: 1 / 3 = 0.333 tbsp. The Australian metric tablespoon is 4 tsp, not 3.
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Disclaimer
Unit conversions on this site use internationally recognized, fixed conversion factors (for example, 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 °F = (°C × 9/5) + 32). They are provided for general, informational, and educational use. For applications where accuracy is critical — such as medical dosing, engineering, scientific research, trade, or legal compliance — always verify results against authoritative sources such as the U.S. National Institute of Standards and Technology (NIST) and the official International System of Units (SI) brochure, and follow any applicable local standards.
Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 US gallon (gal) = 3.785411784 litres (exact, 231 in³)
- EXACT1 US fluid ounce (fl oz) = 29.5735295625 mL (exact, 1/128 gal)
- EXACT1 US cup = 236.5882365 mL (exact, 8 fl oz)
- EXACT1 US pint (pt) = 473.176473 mL (exact, 16 fl oz)
- EXACT1 US quart (qt) = 946.352946 mL (exact, 32 fl oz)
- EXACT1 litre (L) = 1000 millilitres (definition)
Common Pitfalls & How to Avoid Them
US vs. Imperial (UK) cups
A US cup is 236.59 mL, but a UK/metric cup is 250 mL and an Imperial cup is ~284 mL. Recipes from different countries are not interchangeable drop-in.
Fluid ounce is volume, not mass
A US fl oz is 29.57 mL of volume. 1 fl oz of water ≈ 29.57 g, but 1 fl oz of honey or oil weighs more. Do not treat fluid ounces as grams.
Teaspoon/tablespoon sizes differ
1 US tbsp = 14.7868 mL; 1 US tsp = 4.92892 mL. Metric measuring spoons are 15 mL and 5 mL — close but not exact; for baking precision use weighed grams.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This article was reviewed for accuracy