Tbsp to Teaspoon: Convert Tablespoons to Teaspoons
Convert tbsp to teaspoon: one US tablespoon equals 3 teaspoons. Learn the exact ratio, the metric exception, and common spoon conversions.
Why Tablespoons to Teaspoons Comes Up
US recipes switch freely between tablespoons and teaspoons, and halving or doubling a recipe often means converting one to the other. Knowing the ratio keeps measurements exact.
One US tablespoon equals 3 US teaspoons. Our tablespoon converter shows the milliliter value, and the tsp ratio is fixed.
The Tbsp to Teaspoon Formula
The US customary spoon system sets 1 tablespoon equal to 3 teaspoons. Multiply tablespoons by 3 to get teaspoons.
The Exact Calculation
For 1 tbsp: 1 × 3 = 3 tsp. For 2 tbsp: 2 × 3 = 6 tsp. For 1/2 tbsp: 0.5 × 3 = 1.5 tsp. The ratio is exact by US definition.
In milliliters, 1 tbsp is about 14.79 ml and 1 tsp is about 4.93 ml, and 3 × 4.93 = 14.79, confirming the 3-to-1 ratio.
Watch the Metric Tablespoon
In Australia and some other countries, a "tablespoon" is 20 ml, which is 4 metric teaspoons of 5 ml, not 3. The 3-to-1 ratio applies to US and UK teaspoons and tablespoons; use 4-to-1 for the Australian metric tablespoon.
What the Numbers Look Like
A recipe calling for 1 tbsp of vanilla is 3 tsp. A 2 tbsp measure of oil is 6 tsp. Small spice amounts like 1/4 tsp are common, and 3 of them make 3/4 tsp, not 1 tbsp.
For the milliliter value of a teaspoon, our guide to teaspoons to ml covers the metric side.
Tbsp to Teaspoon Compared With Nearby Values
Reference points: 1/2 tbsp = 1.5 tsp, 1 tbsp = 3 tsp, 3 tbsp = 9 tsp. Each tablespoon adds exactly 3 teaspoons.
The reverse, tsp to tbsp, divides by 3, so 6 tsp = 2 tbsp and 9 tsp = 3 tbsp.
When You Need Tbsp in Teaspoons
The conversion matters when scaling recipes or when you only have a teaspoon measure. Halving a 1 tbsp dose gives 1.5 tsp, a common adjustment.
It also helps when a recipe lists one spoon and your set uses the other, keeping the bake consistent.
Frequently Asked Questions
How many tsp is 1 tbsp?
1 US tablespoon equals exactly 3 US teaspoons.
How do I convert tbsp to tsp?
Multiply tablespoons by 3. For 2 tbsp: 2 × 3 = 6 tsp.
Is a tablespoon 3 or 4 teaspoons?
In the US and UK it is 3 teaspoons. The Australian metric tablespoon is 20 ml, which is 4 metric teaspoons.
How many tsp is 1/2 tbsp?
1/2 tablespoon equals 1.5 teaspoons.
How many ml is a tablespoon?
A US tablespoon is about 14.79 ml, and a teaspoon is about 4.93 ml; 3 teaspoons make one tablespoon.
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Tablespoons to mL Converter
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Quick Summary
1 US tablespoon equals 3 teaspoons. Multiply tablespoons by 3: 1 × 3 = 3 tsp. Note the Australian metric tablespoon is 20 ml (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