Teaspoons to MillilitersFree online conversion calculator — instant results, no sign-up
Convert teaspoons to milliliters and back.
Sign in to save results and favorites.
About the Teaspoons to Milliliters
The Teaspoons to Milliliters calculator converts a volume entered in teaspoons into milliliters and shows the reverse unit relationship. It uses the US customary teaspoon rather than the metric teaspoon. With the default input of 1 teaspoon, the result is 4.928922 milliliters.
- Value in teaspoons (teaspoons)
- Enter the volume in US customary teaspoons; the default value is 1 teaspoon.
Formula and method
V_mL = V_tsp × k; V_tsp = V_mL ÷ k, where k ≈ 4.928922 mL/tsp.
- V_mLVolume in milliliters.
- V_tspVolume in US customary teaspoons.
- kMilliliters per US customary teaspoon, shown rounded to six decimal places as 4.928922.
Multiply the entered teaspoon value by the US customary teaspoon-to-milliliter conversion factor. For the default input, 1 × 4.928922 gives 4.928922 milliliters at the displayed precision. The reverse unit relationship is obtained by taking the reciprocal of the factor: 1 milliliter equals approximately 0.202884 teaspoons.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in teaspoons1 teaspoons
Results
- milliliters4.928922
- 1 teaspoons =4.928922 milliliters
- 1 milliliters =0.202884 teaspoons
How to use the Teaspoons to Milliliters
- 1Check that your source measurement uses US customary teaspoons, not metric teaspoons.
- 2Enter the volume in the Value in teaspoons (teaspoons) field, or leave the default value of 1.
- 3Read the milliliters result; the default input produces 4.928922 milliliters.
- 4Review the forward and reverse equivalence rows to confirm the unit relationships.
- 5To convert a milliliter amount back to teaspoons, divide that amount by the teaspoon-to-milliliter factor.
Reading your result
The milliliters output is the converted volume: for the default input, milliliters = 4.928922. The forward equivalence row, displayed as “1 teaspoons = = 4.928922 milliliters,” states the same conversion. The reverse row, “1 milliliters = = 0.202884 teaspoons,” states the teaspoon equivalent of one milliliter; it is a unit relationship, not a conversion of the full forward result back to teaspoons. The repeated equals signs are display formatting and do not change the meaning.
Limitations
This tool assumes the US customary teaspoon, defined as 4.92892159375 milliliters, with results shown here rounded to six decimal places. A metric teaspoon is 5 milliliters, so these results should not be substituted directly for metric-teaspoon measurements. Household spoons vary in capacity, and displayed decimal places do not guarantee matching measurement accuracy. The calculator converts volume only, not mass or ingredient weight. For medication, follow the labeled milliliter dose and use an appropriate dosing device rather than a household spoon.
Common questions
Why does 1 teaspoon give 4.928922 milliliters instead of 5?+
The calculator uses the US customary teaspoon. Its milliliter equivalent rounds to 4.928922, whereas a metric teaspoon is defined as 5 milliliters.
What does the 0.202884 teaspoons output mean?+
It means that 1 milliliter is approximately 0.202884 US customary teaspoons. It is the rounded reciprocal of the forward conversion factor.
How do I convert milliliters back to teaspoons?+
Divide the milliliter volume by the US customary teaspoon-to-milliliter factor, approximately 4.928922. For the displayed reverse relationship, 1 milliliter converts to approximately 0.202884 teaspoons.
Does this conversion depend on whether I measure water or oil?+
No. A teaspoon-to-milliliter conversion compares volumes, so the factor is the same for water and oil. Converting either volume to grams would require the substance's density.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
You might also like
Liters to US Gallons
Convert liters to US gallons and back.
US Gallons to Liters
Convert US gallons to liters and back.
Cups to Milliliters
Convert US cups to milliliters and back.
Milliliters to Cups
Convert milliliters to US cups and back.
Tablespoons to Milliliters
Convert tablespoons to milliliters and back.
Fluid Ounces to Milliliters
Convert US fluid ounces to milliliters and back.
Results are estimates for informational purposes and are not financial, medical or legal advice.