Tablespoon to Teaspoon Converter – US, Metric, and Imperial UK
Converting between tablespoons and teaspoons is one of the most common tasks in everyday cooking and baking. Whether you are halving a recipe, scaling up for a crowd, or working from a recipe that uses a different measuring system, this converter handles the calculation instantly across US Customary, Metric, and Imperial UK units — along with informal culinary measures like pinch, dash, and drop.
The Core Ratio: 3 Teaspoons = 1 Tablespoon
The fundamental relationship is consistent across all three major measurement systems: 1 tablespoon = 3 teaspoons. What differs is the absolute volume:
- US Customary: 1 tablespoon =
14.7868 mL; 1 teaspoon =4.92892 mL - Metric: 1 tablespoon =
15 mLexactly; 1 teaspoon =5 mLexactly - Imperial UK: 1 tablespoon =
17.7582 mL; 1 teaspoon =5.9194 mL
A UK tablespoon is about 20% larger than a US tablespoon. Using the wrong standard in a spice-heavy recipe — say, a dish calling for 1 tablespoon of cayenne pepper — can produce noticeably different results. Always identify which system a recipe uses before measuring.
How the Conversion Works
All conversions in this tool use millilitres as the canonical base unit. The formula is straightforward:
result = inputValue × fromUnitInML ÷ toUnitInML
For example, converting 2 US tablespoons to UK teaspoons:2 × 14.7868 ÷ 5.9194 ≈ 4.996 UK tsp. Because the millilitre factors differ between systems, cross-system conversions never produce whole numbers — which is why choosing the right system first matters.
Informal Culinary Units: Pinch, Dash, and Drop
Older and handwritten recipes frequently use pinch, dash, and drop without defining them precisely. The broadly accepted culinary standards are:
- Pinch: approximately
1/8 teaspoon (US)or0.308 mL— typically what fits between two fingers - Dash: approximately
1/8 tablespoon (US)or0.616 mL— twice a pinch; common in cocktail recipes - Drop: approximately
0.0513 mL— used mainly for concentrated extracts and food coloring
These values are approximate. Individual sources disagree by as much as 50%, so treat pinch/dash conversions as practical estimates rather than laboratory measurements.
Entering Fractions
Recipe measurements are frequently given as fractions: 1/3 tbsp, 2 1/2 tsp, or 3/4 cup. This converter accepts all three input formats: plain decimals (1.5), simple fractions (1/3), and mixed numbers (2 1/2). The input is parsed automatically before conversion so you never need to do the decimal arithmetic yourself.
Common Kitchen Reference Ratios
The following relationships are US Customary standards and are especially useful when scaling recipes or substituting measuring spoons:
- 3 tsp = 1 tbsp — the most-used kitchen conversion
- 2 tbsp = 1 fl oz
- 16 tbsp = 1 cup (or 48 tsp = 1 cup)
- 8 tbsp = ½ cup; 4 tbsp = ¼ cup
- 1 dash = 2 pinches; 8 pinches = 1 tsp
US vs Metric vs Imperial UK — When It Matters Most
For liquid ingredients such as water, milk, or oil, the difference between US and metric teaspoons (4.93 mL vs 5 mL) is negligible in most recipes. However, for dry spices, leavening agents (baking powder, baking soda), and salt, even a small absolute volume difference can affect flavor and texture. A recipe calling for 1 tsp of baking soda that is prepared with a UK teaspoon instead of a US teaspoon delivers about 20% more leavening power — potentially causing a cake to over-rise or collapse.
When following recipes from different regions, confirm the measurement system and use this converter to recalculate spoon quantities to your local standard. This is particularly important for baking recipes from UK sources when using US measuring spoons, and vice versa.
Multi-Unit Reference Table
The all-unit reference table below the result panel shows your input quantity expressed in every supported unit simultaneously. This is helpful when a recipe uses one unit (say, fluid ounces) but your measuring spoons are marked in teaspoons — you can find the equivalent in any unit without performing additional calculations.