mL to Teaspoon
Converter

How do I convert mL to teaspoons? Divide the volume in mL by 5 for metric teaspoons, or by 4.92892159375 for US teaspoons. Teaspoon definitions

Whether you’re measuring ingredients or scaling a recipe, this converter helps you switch from milliliters to teaspoons. Choose the teaspoon standard, enter your volume, and press Calculate to see the result.

Wondering how much 40 mL is in teaspoons, or checking a 10 mL to tsp conversion? With metric teaspoons, 40 mL equals 8 tsp and 10 mL equals 2 tsp. Using US teaspoons, those amounts are approximately 8.1154 tsp and 2.0288 tsp, respectively. US and metric conversions

Below, you’ll find conversion instructions, worked examples and a quick-reference table with separate US and metric columns, making it easy to check common amounts.

For example, 10 mL equals 2 metric teaspoons or approximately 2.0288 US teaspoons. The result depends on the selected teaspoon standard. To check this conversion, follow these steps. Wikipedia

Choose the teaspoon standard specified by your recipe, label or measurement source. A US customary teaspoon holds 4.92892159375 mL, while a metric teaspoon holds 5 mL. Teaspoon reference

For US nutrition labeling, the FDA also defines a teaspoon as 5 mL. FDA guidance Use the table below to select the appropriate standard. If another calculator uses a different convention, check its stated conversion factor before comparing results.

**How to Convert Milliliter to Teaspoon (US) :To convert milliliters into US teaspoons**, multiply the volume in mL by approximately 0.2028841362. One US teaspoon equals 4.92892159375 mL.

(1) Check that your converter uses US teaspoons.

(2) Enter the volume in milliliters.

(3) Multiply by the conversion factor.

(4) Write the result with the unit symbol tsp.

For metric teaspoons, divide the volume in mL by 5. A metric teaspoon holds exactly 5 mL.

(1) Check that your converter uses metric teaspoons.

(2) Enter the volume in milliliters.

(3) Divide by 5.

(4) Add tsp after the result.

Find your volume in the first column, then read across to the teaspoon standard you need. A US teaspoon holds 4.92892159375 mL, while a metric teaspoon holds exactly 5 mL. US conversions below are rounded to four decimal places; metric conversions are exact.

Common amounts appear first; the additional table preserves the remaining values. Fractions in the metric column are exact.

For the reverse conversion, choose the number of teaspoons and read the corresponding mL value under the correct standard. These measurements refer to level teaspoons, not heaped spoonfuls.

To convert back to mL, multiply by the mL-per-teaspoon factor for the same standard.

Definition: A milliliter (mL) is a metric unit for measuring volume. Picture a liter divided evenly into 1,000 parts: each part holds one milliliter. NIST That relationship explains the prefix milli, meaning one-thousandth, or 10⁻³. NIST To convert milliliters into US teaspoons, divide by 4.92892159375—the exact number of milliliters in one US teaspoon. Wikipedia

A milliliter also equals one cubic centimeter (cm³), or 0.000001 cubic meters (m³), and approximately 0.061 cubic inches. Wikipedia The forms mL, ml, and mℓ all refer to this same volume. However, mL is easier to read because its capital L is less likely to be mistaken for the digit 1. Wikipedia The spelling changes with location, too: milliliter and liter are the US forms, while millilitre and litre are used internationally. Wikipedia

Current use: Milliliters become easier to picture when you look at familiar containers, such as a juice box or a drinks can, and consider how much they hold. NIST Measuring cups help with kitchen quantities; laboratories use tools such as graduated cylinders, beakers, and pipettes, each suited to different tasks and levels of precision. Wikipedia Medical references may use cc for injection volumes, while engineers use it when describing engine displacement.

A cc is a cubic centimeter, so 1 cc and 1 mL represent equal volumes. Wikipedia The name litre traces back to litron, an older French measure; the litre later served as a base unit in the original French metric system. Under today’s International System of Units (SI), the cubic meter is the SI unit of volume, while the liter is accepted for use alongside SI units. NIST

Definition: A teaspoon (tsp) is a unit of volume used in cooking and measurement. In the US customary system, it equals 1/3 of a tablespoon or 1/6 of a fluid ounce, with 1 teaspoon measuring approximately 4.929 milliliters. Wikipedia To convert milliliters into US teaspoons, multiply the amount in mL by approximately 0.20288414. The symbol US tsp identifies the US measurement, which matters because teaspoon sizes differ between measurement systems. Wikipedia

Current use: Recipes may abbreviate teaspoon as tsp, t, ts, or tspn; expressions such as 1 tsp, 1 t, 1 ts, and 1 tspn indicate the same quantity within the measurement system being used. Recognizing these forms helps when reading cooking instructions, although the abbreviation alone does not establish which teaspoon standard a recipe follows.Wikipedia

For nutrition labeling, the FDA defines 1 teaspoon as exactly 5 milliliters. When converting a quantity from a US nutrition label, divide its volume in milliliters by 5 to find the corresponding number of teaspoons. FDA

A worked example most converters skip. Take a 5 mL dose. In metric teaspoons that is exactly 1 tsp; in US teaspoons it is 1.0144 tsp. The gap is 0.0144 tsp — utterly harmless for a cup of coffee, but it compounds. Convert 50 mL and the two standards diverge by roughly 0.7 tsp; at 250 mL, by about 0.7 US-vs-metric teaspoons more still. For cooking this never matters. For a measured liquid where precision counts, the standard you pick is the whole answer.

The edge case that trips people up: medicine. A calculated teaspoon is a defined volume, not the spoon in your drawer — cutlery teaspoons range widely and are not measuring tools. The UK's Great Ormond Street Hospital (NHS) advises using the oral syringe or measuring cup supplied with the medicine, never a kitchen spoon. So while 5 mL "equals 1 teaspoon" on paper, for a dose you measure the 5 mL directly with a calibrated device, not by counting teaspoons.

Why the same ingredient never changes the answer. A volume-to-volume conversion is fixed: 5 mL is 1 metric teaspoon whether it is water, oil, or syrup. What changes with the ingredient is mass, not volume — 5 mL of oil weighs less than 5 mL of honey. If your real question is milligrams, a teaspoon factor cannot answer it; you need the ingredient's concentration (mg per mL) first, as defined by NIST's volume standards.

Quick rule of thumb to memorise. For everyday metric use: mL ÷ 5 = teaspoons. For US precision: mL × 0.2029 = teaspoons. If two calculators disagree, they are almost never "wrong" — they are using different teaspoon definitions or rounding to different decimal places. Check the factor, not just the number.

A difference in the answer may simply reflect a difference in the unit. For 10 mL, the metric calculation gives 2 tsp and the US calculation gives approximately 2.0288 tsp. Work backward with the same factor: 2 × 5 returns 10 mL. If you reverse a rounded result, a small leftover difference is expected. These examples follow the definitions above.

The ingredient does not change a volume-to-volume conversion: 5 mL corresponds to 1 metric teaspoon whether you are measuring water or oil. What can change is the mass or ingredient amount within that volume. If your question involves milligrams, read how mg/mL concentration works, then use the mg to mL calculator with a verified concentration. A teaspoon factor alone cannot supply that information.

A calculated teaspoon is a defined volume, not a guarantee about a spoon from the cutlery drawer. For medicine, follow the product's measuring instructions and use an appropriate calibrated device; do not substitute a household spoon. NHS measuring guidance

Once you're comfortable with mL to tsp, exploring other volume conversions becomes natural. Using multiple tools together makes ingredient measuring significantly more efficient.

A range of volume calculators supports accurate conversions between mL, tsp, and many other units used in everyday cooking — from tablespoons and fluid ounces to cups and liters. These tools are designed for both beginners and experienced cooks.