US Teaspoons to Milliliters
Convert US teaspoons to milliliters and back, instantly.
Compare small recipe volumes
US teaspoons are used for small cooking quantities, while milliliters are common on metric recipes and liquid labels. A teaspoon is frequently rounded to 5 milliliters, yet the formal US customary value is about 4.92892 milliliters. This page exposes that difference instead of hiding it.
With the default input, 1 US teaspoon converts to 4.92892 milliliters. Reversing the direction shows that 5 milliliters equals 1.01442 US teaspoons. The reference values help with recipe scaling, while decimal entry supports fractions smaller than a full spoon.
Private conversion with a dosing caution
Calculations happen locally in your browser and no amount is uploaded. The tool is suitable for general unit translation, not medication instructions. Liquid medicines should be measured with a calibrated syringe or cup according to the product label and advice from a qualified professional.
Frequently Asked Questions
How many milliliters are in a US teaspoon?
One US customary teaspoon equals approximately 4.92892 milliliters.
Why is a teaspoon often shown as 5 milliliters?
Five milliliters is a convenient metric rounding and is also used for standardized medicine spoons, but it is slightly larger than a US customary teaspoon.
Should I use a household spoon for medicine?
No. Household spoons vary. Use the calibrated dosing device supplied with the medicine and follow professional guidance.
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