tsp to mL Converter
Convert teaspoons into accurate milliliter amounts
Teaspoons to milliliters FAQ
How do you convert teaspoons to milliliters exactly?
This calculator uses the standard US teaspoon definition where 1 tsp = 4.92892159375 milliliters. To convert tsp to mL, you multiply the teaspoon value by 4.92892159375. For example, 1.5 tsp becomes about 7.393 mL. The tool handles this multiplication for you and formats the answer so it is easy to read and copy into recipes, medication logs or tracking apps.
Why do some cookbooks say 1 teaspoon = 5 mL?
In everyday cooking, many books and measuring spoons round the teaspoon to 5 mL because it is simple to remember. The official US customary teaspoon, however, is slightly smaller at about 4.93 mL. This converter uses the more precise 4.9289 mL value, but in the kitchen you can usually treat 1 tsp as 5 mL without causing problems, especially in home cooking where small differences rarely affect the result.
Is this using US teaspoons, metric teaspoons or UK teaspoons?
There are several teaspoon definitions around the world. This page uses the US customary teaspoon, defined as exactly one third of a US tablespoon and based on the US fluid ounce. A metric teaspoon is usually defined as 5 mL, and some older UK recipes may assume slightly different volumes. If your spoons or medicine labels are marked in “tsp” and come from the US, this converter matches that standard closely.
What is 1 teaspoon in mL for medicine dosing?
Using the exact US definition, 1 tsp ≈ 4.93 mL. Many over-the-counter medicines still print dosage instructions in teaspoons, but dosing syringes, cups and droppers are almost always marked in milliliters. This calculator helps you translate between “teaspoons” on the label and the syringe markings when you want to double-check your dose. For medicines, always follow your doctor’s or pharmacist’s instructions first.
Can I use this for baby formula, supplements and baking?
Yes. Baby formulas, liquid supplements, flavor drops, extracts and baking recipes frequently mix teaspoons and milliliters. A quick teaspoons to milliliters conversion lets you use whatever tools you have on hand: marked spoons, mL syringes, jiggers or digital scales. For sensitive uses like infant feeding or strong supplements, rounding carefully and staying close to the recommended dose is important.
How many decimal places of mL should I keep?
In most home uses, one decimal place in milliliters is plenty. For example, 1.25 tsp becomes roughly 6.2 mL. For casual cooking, even whole-number milliliters are fine. If you are dealing with medicines, concentrated flavors or lab work, you might care about more digits, but the main priority is consistent measuring equipment and following the official instructions on the product.
Why do my teaspoons and mL syringes sometimes disagree?
Real-world spoons, cups and syringes often have manufacturing tolerances and different rounding rules. A teaspoon from a cutlery drawer can hold more or less than a standardized cooking teaspoon, and syringes might be marked in whole-number milliliters. The calculator returns values based on the official teaspoon to milliliter relationship, but physical tools may introduce small differences. That is normal and expected in most kitchen and household settings.
From teaspoons on the label to milliliters in your tools
This tsp to mL converter is built for all the everyday situations where instructions are written in teaspoons, but your measuring tools or tracking apps use milliliters. That happens in recipes, medicine dosing, baby formulas, supplement scoops and DIY mixes. Instead of guessing or doing mental math, you type the teaspoons, tap convert, and read a clean line such as “1.5 tsp ≈ 7.39 mL”.
1. One small input, one clear result
The interface stays deliberately simple: there is a single input field for teaspoons and a result card below. You can enter small fractions like 0.25 tsp for a pinch of spice, or larger amounts like 6 tsp for a small recipe batch. The converter immediately multiplies by the precise US teaspoon factor and returns the milliliter value using easy-to-read formatting that works on phones, tablets and desktops.
When you need the reverse direction, the “Swap Units” button takes you straight to the mL to tsp page. That keeps the pair of tools working together so you can move between teaspoons and milliliters without adjusting how you like to think about the quantities.
2. Exact relationship: 1 tsp ≈ 4.92892159375 mL
Under the hood, this page uses the official US definition for the teaspoon, derived from the US fluid ounce. That gives 1 teaspoon ≈ 4.92892159375 milliliters. The converter applies this factor consistently so you can rely on the results when you are preparing baby bottles, recording medicine doses or scaling up test recipes. If you need to work with other volume units like cups, tablespoons or fluid ounces, the volume conversion calculator covers a wider set of units in the same style.
3. Common tsp to mL values at a glance
Here are some example conversions that match the calculator output. They make handy checkpoints when you sanity-check labels, dosing charts and recipes:
| Teaspoons (tsp) | Milliliters (mL) |
|---|---|
| 1/4 tsp | ≈ 1.23 mL |
| 1/2 tsp | ≈ 2.46 mL |
| 1 tsp | ≈ 4.93 mL |
| 1.5 tsp | ≈ 7.39 mL |
| 2 tsp | ≈ 9.86 mL |
| 3 tsp | ≈ 14.79 mL |
| 4 tsp | ≈ 19.71 mL |
| 6 tsp | ≈ 29.57 mL (about 1 US fl oz) |
A quick mental shortcut is to multiply by five and subtract a little. For example, 2 tsp → 10 minus a bit ≈ 9.5–10 mL. The calculator replaces this rough estimate with an exact figure whenever you want more confidence, such as when following precise baking recipes or reading medication instructions.
4. Where the tsp to mL converter shines
You will most often reach for this tool in situations like:
- Home cooking and baking — translate teaspoon-based recipes into milliliters when you use metric jugs and syringes.
- Medicine dosing — compare “teaspoon” instructions on labels with syringes and cups that are marked only in mL.
- Baby formulas and feeding — align teaspoons in guides with milliliter markings on bottles, scoops and dosing tools.
- Supplements and tinctures — convert recommended teaspoon doses into mL so you can measure with more precise equipment.
- DIY projects and small-batch mixes — scale homemade cleaners, beauty products and flavor blends that mix teaspoons and milliliters.
Because it is anchored to officially recognised definitions, you can come back to this teaspoons to milliliters converter any time and get consistent, predictable results that fit both everyday home use and more careful record keeping.
References and further reading on teaspoons and milliliters
These references explain how teaspoons and milliliters are defined and used:
- Teaspoon — describes culinary and measurement teaspoons, including US and metric variants.
- Millilitre — explains the milliliter as a metric volume unit and its relation to litres and cubic metres.
- SI Units — Volume (NIST) — provides official background on volume units, including litres and millilitres, within the SI framework.
For medicines and infant feeding, always follow the dosing instructions from your healthcare provider and the product label first, and use this converter only as a supporting calculation.