Enter tablespoons and choose the recipe's spoon system to find the matching number of teaspoons.
Table of contents
How to use our Tablespoons to Teaspoons Converter
- Choose the recipe's "Spoon system." Use "US cooking measures" for most US recipes, and choose the Australian option for an Australian recipe.
- Enter the source amount in "Tablespoon amount (tbsp)." You can enter a decimal such as 0.5, a fraction such as 1/3, or a mixed fraction such as 1 1/2.
- Select "Calculate" to see the teaspoon equivalent.
- Check "Measurement system used" before measuring. US and metric systems use 3 teaspoons per tablespoon, while the Australian selection uses 4 metric teaspoons per tablespoon.
Definitions
Tablespoon (tbsp): The cooking volume amount entered into this converter.
Teaspoon (tsp): The smaller cooking volume amount shown after conversion.
US cooking measures: A system in which 1 tablespoon equals 3 teaspoons.[1]
Metric spoons: A system in which 1 metric tablespoon equals 3 metric teaspoons.
Australian tablespoon: A 20 mL tablespoon used with a 5 mL metric teaspoon, so 1 tablespoon equals 4 teaspoons.
Common mistakes and quick fixes
Mistake: Reading tbsp as tsp, or entering a teaspoon amount in the tablespoon field.
Fix: Enter only the source amount marked tbsp or tablespoon. The calculator converts that amount to tsp.
Mistake: Using the US setting for an Australian recipe.
Fix: Select "Australian tablespoon and metric teaspoon" before calculating. One Australian tablespoon equals 4 metric teaspoons.
Mistake: Entering an ingredient weight, such as 20 grams, as a spoon amount.
Fix: Enter a tablespoon volume from the recipe. A volume-to-weight conversion also needs the ingredient's density.
Mistake: Typing an invalid fraction such as 1/0 or malformed commas such as 1,01.
Fix: Use a fraction with a nonzero denominator. Use commas only for thousands, such as 1,000, and use a decimal point for decimals.
Limitations & Key Assumptions / Boundary Conditions
- This is a volume conversion. It does not convert tablespoons to grams, ounces by weight, or calories.
- The answer depends on the spoon system used by the recipe. Check the recipe source when it was published outside the United States.
- Ordinary kitchen spoons can differ from marked measuring spoons. Use measuring spoons when the amount matters.
- The calculator accepts zero and positive recipe amounts. Negative volumes are outside normal recipe use.
Methodology
Conversion method
The calculator applies a fixed teaspoon-per-tablespoon ratio for the selected spoon system. US cooking measures and metric spoons use 3 teaspoons per tablespoon. The Australian selection uses 4 metric teaspoons per tablespoon.
teaspoons = tablespoons * selected ratio
selected ratio = 3 for US or metric, 4 for Australian
Worked example
For 1 1/2 US tablespoons, the calculator changes the mixed fraction to 1.5, then multiplies 1.5 by 3. The answer is 4.5 teaspoons.
Number handling
The calculator accepts decimals, simple fractions, mixed fractions, scientific notation, and a matching tbsp or tablespoon suffix. It rejects negative amounts, fractions with a zero denominator, malformed comma grouping, and a tsp suffix because the source field is for tablespoons.