Teaspoons to Milliliters
Type US teaspoons (tsp), see milliliters (mL).
By Akash Yadav Updated 27 September 2026
Type a number above to see the answer.
Or tap a number:
The formula
How to convert teaspoons to milliliters
To change teaspoons into milliliters, multiply by 4.92892159375.
milliliters = teaspoons × 4.92892159375
Going the other way: teaspoons = milliliters × 0.202884136211
1 US teaspoon = 4.92892159375 milliliters. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 3 teaspoons. Multiply by 4.92892159375. 3 × 4.92892159375 = 14.7868 mL.
Common values
Teaspoons to milliliters conversion table
| Teaspoons (tsp) | Milliliters (mL) |
|---|---|
| 0.125 tsp | 0.6161 mL |
| 0.25 tsp | 1.2322 mL |
| 0.5 tsp | 2.4645 mL |
| 0.75 tsp | 3.6967 mL |
| 1 tsp | 4.9289 mL |
| 1.5 tsp | 7.3934 mL |
| 2 tsp | 9.8578 mL |
| 2.5 tsp | 12.3223 mL |
| 3 tsp | 14.7868 mL |
| 4 tsp | 19.7157 mL |
| 5 tsp | 24.6446 mL |
| 6 tsp | 29.5735 mL |
| 8 tsp | 39.4314 mL |
| 10 tsp | 49.2892 mL |
Before you rely on it
The 4.93 mL teaspoon and the 5 mL teaspoon
This page uses the US customary teaspoon: exactly one sixth of a US fluid ounce, which is 4.92892159375 mL. Three of them make a US tablespoon.
Metric recipes, US nutrition labels and medicine all use a 5 mL teaspoon. The two differ by about 1.4 percent, which no kitchen spoon can measure — so for cooking, 1 teaspoon and 5 mL are interchangeable.
For medicine, do not convert at all. Dose in milliliters with the syringe or cup that came with it: kitchen teaspoons vary a lot in size, and that spread is where dosing errors come from.
A teaspoon measures volume, not weight. A teaspoon of salt and a teaspoon of flour fill the same spoon but weigh different amounts.
Common questions
Frequently asked questions
How many mL is 1 teaspoon?
1 US teaspoon is exactly 4.92892159375 mL, about 4.93 mL. The metric and medicine teaspoon is 5 mL.
How many mL is half a teaspoon?
Half a US teaspoon is about 2.46 mL — 2.5 mL on a metric spoon.
How many mL is 2 teaspoons?
2 US teaspoons is about 9.86 mL.
How many mL is a quarter teaspoon?
A quarter of a US teaspoon is about 1.23 mL.
How many teaspoons are in a tablespoon?
A US tablespoon holds exactly 3 teaspoons.
Is 5 mL the same as 1 teaspoon?
For cooking and medicine, yes — 5 mL is the metric teaspoon. Against the US customary teaspoon, 5 mL is about 1.014 tsp.
Keep going
Related converters
- Milliliters to Teaspoons mL → tsp
- Tablespoons to Milliliters tbsp → mL
- Cups to Milliliters cup → mL
- All volume converters
Every factor on this page is listed in our conversion methodology.