Teaspoons to mL Converter
Convert US teaspoons to milliliters for cooking, baking, and medicine dosing.
How It Works
Formula: tsp to mL = value × 4.92892159
Example: 1 tsp = 4.928922 mL
Note: 1 US teaspoon equals 4.9289 milliliters (1/6 of a fluid ounce), the standard in American cooking.
Common Uses
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.01 mL
Precision Guidance
For cooking, round to 1 decimal. For medicine, follow label instructions and do not round loosely.
Common Mistakes
The US teaspoon (4.93 mL) is often rounded to 5 mL, but precise recipes use 4.9289 mL.
Frequently Asked Questions
What is 1 teaspoon in mL?
1 US teaspoon equals 4.9289 milliliters (1 tsp = 1/6 fl oz = 4.92892159 mL).
How do I convert teaspoons to mL?
Multiply the teaspoon value by 4.9289. For example, 2 tsp × 4.9289 = 9.8578 mL.
Is a US teaspoon 5 mL?
The US teaspoon is 4.93 mL. Many medical dosing charts round to 5 mL for simplicity, but cooking uses 4.93 mL.
How many teaspoons in a tablespoon?
1 US tablespoon equals 3 US teaspoons.
Deep Dive Guide
Teaspoons to mL: Convert US Small Measures to Metric
Convert teaspoons to mL with the exact US formula (1 tsp = 4.92892 mL). Covers seasoning, baking, and dosing for everyday American cooking.
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Last Updated 2026 | This converter was reviewed for accuracy