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Free Teaspoons (US) to Milliliters Converter

A US teaspoon is 4.92892159 milliliters—essential for measuring spices, vanilla extract, baking soda, and accurately dosing liquid medications worldwide.

1 tsp = 4.929 mL

Pick any units and edit either box — it converts instantly in your browser.

Quick answer

One US teaspoon equals 4.93 milliliters. Multiply teaspoons by 4.93 for mL. A metric teaspoon is 5 mL, and a UK teaspoon is also 5 mL—watch for small rounding errors in international recipes.

Formula & method

milliliters = teaspoons (us) × 4.92892159
  • tsp — value in teaspoons (us)
  • mL — result in milliliters
  • 4.92892159 — exact conversion factor (1 tsp = 4.92892159 mL)

To convert back, divide by 4.92892159 (1 mL = 0.202884 tsp).

Teaspoons (US) to Milliliters — common values

Teaspoons (US) (tsp)Milliliters (mL)
0.25 tsp1.232 mL
0.5 tsp2.464 mL
1 tsp4.929 mL
1.5 tsp7.393 mL
2 tsp9.858 mL
3 tsp14.787 mL
4 tsp19.716 mL
6 tsp29.574 mL

Examples

Example 1: A pinch of salt or spice
Input
0.5 tsp
Result
2.464 mL
Why
Half teaspoon of pepper or fresh herbs in a dish
Example 2: A standard spice measure
Input
1 tsp
Result
4.929 mL
Why
Cinnamon, ginger, or cumin in most recipes
Example 3: Vanilla extract for a cake
Input
3 tsp
Result
14.787 mL
Why
Classic amount in a layer cake or frosting
Example 4: A dose of liquid cough medicine or syrup
Input
2 tsp
Result
9.858 mL
Why
Common children's medicine dosing from a 5 mL syringe

Common mistakes

  • Mixing up unit definitions — US teaspoon = 4.93 mL; a metric teaspoon is 5 mL.
  • Rounding too early. Multiply by the full factor (4.92892159) first, then round only the final milliliters value.
  • Converting the wrong way. This page goes Teaspoons (US) → Milliliters; to go back, divide by 4.92892159.

Frequently asked questions

What's the difference between a US teaspoon and other teaspoons?

A US teaspoon is 4.93 mL; a metric or UK teaspoon is 5 mL. The difference is about 1%, so it barely matters for cooking, but for medicine dosing, always use a syringe marked in mL and follow the label.

Why is medicine often dosed in 5 mL when the teaspoon is 4.93 mL?

Manufacturers round teaspoons to 5 mL for simplicity and international consistency. When giving medication, use a syringe or dose cup marked in mL, not a regular spoon.

Can I use a regular eating teaspoon to measure medicine?

No. Regular teaspoons vary widely (3–8 mL). Always use a marked measuring spoon, a syringe (from a medicine bottle), or a dose cup for medicine and baking spices.

How many teaspoons are in a tablespoon?

Exactly 3 US teaspoons equal 1 US tablespoon (3 × 4.93 = 14.79 mL). This is one of the cleaner US cooking conversions.

What if my recipe is from the UK and calls for a teaspoon?

UK teaspoons are 5 mL (not 4.93 mL), but the difference is so small (1%) that for cooking it won't matter. For medicine, always follow the label or ask a pharmacist.

Is there a way to eyeball 1 teaspoon without a measuring spoon?

No reliable way. A rough guide: 1 tsp of liquid ≈ the tip of your thumb (from the base of the nail). But for spices, extracts, and especially medicine, use a proper measuring tool.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

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