1 tsp to mL
- US teaspoons (tsp)
- 1 tsp
- Milliliters
- 4.92892159375 mL
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
US teaspoons to milliliters converter
Convert US teaspoons to milliliters (teaspoons to ml) with the exact factor, a conversion chart and worked steps.
Milliliters
mL
Milliliters: 4.92892159375 mL
- Conversion
- 1 tsp = 4.9289215938 mL
- 1 mL in US teaspoons
- 0.2028841362tsp
1 US teaspoons is 4.9289215938 milliliters. Going the other way, 1 mL is 0.20288414 tsp.
US teaspoons to milliliters
Teaspoons to ml chart
| US teaspoons | Milliliters |
|---|---|
| 0.25 | 1.2322 |
| 0.5 | 2.4645 |
| 0.75 | 3.6967 |
| 1 | 4.9289 |
| 1.5 | 7.3934 |
| 2 | 9.8578 |
| 3 | 14.7868 |
| 4 | 19.7157 |
| 5 | 24.6446 |
How it's calculated S
Conversion factor
Exact by definition.
Multiply
About the US teaspoons to milliliters converter
Teaspoon quantities are useful when a recipe calls for a small amount and only a larger measure is available. Enter fractions precisely and check the US measuring-spoon convention. Ordinary cutlery is not a calibrated measuring tool.
One US teaspoon is exactly 4.9289215938 milliliters, so 1 tsp is 4.928922 mL. To convert teaspoons to ml, multiply by 4.9289215938; to convert back, multiply by 0.2028841362.
The US teaspoon is a third of a tablespoon, exactly 4.92892159375 mL. Because both units are defined exactly, the factor above is exact and the results here carry no conversion error.
Worked examples
4 tsp to mL
- US teaspoons (tsp)
- 4 tsp
- Milliliters
- 19.715686375 mL
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
0.25 tsp to mL
- US teaspoons (tsp)
- 0.25 tsp
- Milliliters
- 1.23223039844 mL
Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)
Questions
When would I convert teaspoons to ml?
Teaspoon quantities are useful when a recipe calls for a small amount and only a larger measure is available. Enter fractions precisely and check the US measuring-spoon convention. Ordinary cutlery is not a calibrated measuring tool.
How many milliliters are in a US teaspoon?
One US teaspoon is exactly 4.9289215938 milliliters. The US teaspoon is a third of a tablespoon, exactly 4.92892159375 mL.
How do you convert teaspoons to ml?
Multiply the number of US teaspoons by 4.9289215938. For example, 1 tsp × 4.9289215938 = 4.928922 mL. To go the other way, divide by 4.9289215938.
How can I estimate teaspoons to ml without a calculator?
Multiply by 5. That is 1.4% high of the exact factor 4.9289215938, so 1 tsp comes out as 5 mL instead of 4.9289.
How accurate is the US teaspoons to milliliters converter?
Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “1 tsp to mL” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).
Where does the method come from?
NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.
About this calculator
Sources
Checked against references
3 worked examples with independently sourced answers ship with this calculator. They run in the test suite; you can run them here too.
Related calculators
- Volume converter
Convert gallons to litres, cups to mL and fl oz to mL exactly, with US and imperial gallons, pints and fluid ounces kept separate.
- Centimeters to inches converter
Convert centimeters to inches (cm to inches) with the exact factor, a conversion chart and worked steps.
- Inches to centimeters converter
Convert inches to centimeters (inches to cm) with the exact factor, a conversion chart and worked steps.
- Millimeters to inches converter
Convert millimeters to inches (mm to inches) with the exact factor, a conversion chart and worked steps.
- Inches to millimeters converter
Convert inches to millimeters (inches to mm) with the exact factor, a conversion chart and worked steps.
- Meters to feet converter
Convert meters to feet (meters to feet) with the exact factor, a conversion chart and worked steps.