Teaspoons to Milliliters Converter - Convert tsp to mL Instantly
Convert US teaspoons (tsp) to milliliters (mL) quickly and accurately with this easy-to-use volume converter. Ideal for cooking, baking, beverages, dosing, and lab prep when small liquid measurements must be precise.
Note: This tool converts US teaspoons (tsp) to mL using the exact factor 4.92892159375 mL per teaspoon. For metric teaspoons (5 mL), use the dedicated converter.
About Teaspoons to Milliliters Conversion
Teaspoons (tsp) and milliliters (mL) both measure volume. The US teaspoon is a common kitchen measure in American recipes and dosing instructions. The milliliter (mL) is the SI metric unit used on global packaging, lab instruments, and in healthcare. Converting teaspoons to mL lets you follow international recipes, prepare accurate doses, and standardize instructions for global audiences.
Because the US teaspoon is linked by exact definitions to the US tablespoon and cup, the tsp-to-mL factor is exact: 1 US tsp = 4.92892159375 mL. Using the exact constant keeps documentation auditable and results reproducible across kitchens, factories, clinics, and labs.
Teaspoons to Milliliters Formula
Use the direct factor method:
mL = tsp × 4.92892159375Example:
2.5 tsp = 2.5 × 4.92892159375 = 12.32230 mL
To convert in the opposite direction:
tsp = mL ÷ 4.92892159375.
US vs Metric Teaspoons
Not all teaspoons are identical across regions. A US teaspoon equals 4.92892159375 mL. A metric teaspoon (used widely outside the US) equals 5 mL. Always verify which teaspoon your recipe, device, or guidance uses and choose the appropriate converter to avoid measurement errors in baking, dosing, and beverage formulation.
Why Convert tsp to mL?
- 🍰 Baking precision: Express spoon-based measures in exact milliliters.
- 🥤 Beverage formulation: Standardize small-volume syrups and extracts.
- 💊 Dosing: Translate teaspoon guidance into precise mL for syringes and cups.
- 🧪 Lab prep: Convert teaspoon references to mL for glassware and instrumentation.
- 📦 Labeling & QA: Provide dual units on instructions and nutrition panels.
Common Conversions
- 1 tsp (US) = 4.92892 mL
- 2 tsp (US) = 9.85784 mL
- 3 tsp (US) = 14.78676 mL (≈ 1 tbsp US)
- 4 tsp (US) = 19.71569 mL
- 6 tsp (US) = 29.57353 mL (≈ 2 tbsp US)
- 8 tsp (US) = 39.43137 mL
- 12 tsp (US) = 59.14706 mL (≈ 1/4 US cup)
- 16 tsp (US) = 78.86275 mL (≈ 1/3 US cup)
What is a Teaspoon?
A teaspoon is a kitchen measure for small liquid (and sometimes dry) amounts. In the US customary system it equals 1/3 of a tablespoon and 1/48 of a US cup. Its exact link to tablespoons and cups is why the conversion to mL is precise.
What is a Milliliter?
The milliliter is a metric unit equal to one-thousandth of a liter. It appears on packaging, lab glassware, and in healthcare. It pairs naturally with teaspoons (5 mL metric) and tablespoons (15–20 mL depending on region), and scales to liters (L) for larger volumes.
Step-by-Step: Converting tsp to mL
- Write down your volume in US teaspoons.
- Multiply by 4.92892159375.
- Express the result in mL (milliliters).
Example walkthrough:
Input: 7.5 tsp (US)
Multiply: 7.5 × 4.92892159375 = 36.96691
Output: 36.96691 mLPrecision, Rounding & Significant Figures
For everyday cooking, 1–2 decimals are often enough, but this tool defaults to 5 for high precision. In professional contexts (R&D, QA, clinical), match significant figures to your instruments and reporting standards to avoid rounding bias across chained calculations.
Use Cases of tsp → mL
- 🎂 Converting US cookbook measures to metric kitchens
- 🧃 Standardizing micro-batch beverage or syrup ratios
- 💉 Translating household dosing into precise mL
- 🧫 Preparing small-volume lab solutions
- 🏷️ Creating dual-unit labels and instructions
Quick Reference Table
| Teaspoons (US tsp) | Milliliters (mL) |
|---|---|
| 1 | 4.92892 |
| 2 | 9.85784 |
| 3 | 14.78676 |
| 4 | 19.71569 |
| 6 | 29.57353 |
| 8 | 39.43137 |
| 12 | 59.14706 |
| 16 | 78.86275 |
Frequently Asked Questions
How do you convert teaspoons to milliliters?
Use the formula: mL = teaspoons × 4.92892159375. One US teaspoon equals exactly 4.92892159375 milliliters.
How many milliliters are in 1 teaspoon?
1 US teaspoon = 4.92892159375 mL. Many home references round to 5 mL, but this tool uses the exact US customary definition for accuracy.
Is a US teaspoon the same as a metric teaspoon?
No. A US teaspoon is 4.92892159375 mL, while a metric teaspoon (used in many regions) is exactly 5 mL. This page converts US teaspoons to mL.
How do I convert milliliters to teaspoons?
Invert the factor: tsp = mL ÷ 4.92892159375. For example, 10 mL ÷ 4.92892159375 ≈ 2.02884 tsp (US).
Do teaspoons measure weight or volume?
Teaspoons (tsp) measure volume. Weight depends on the substance’s density (e.g., 1 tsp of oil weighs less than 1 tsp of honey).
Tips for Accurate Small-Volume Measuring
- Use measuring spoons, syringes, or micropipettes to reduce parallax and meniscus error.
- Confirm whether guidance expects US or metric teaspoons.
- For very small amounts, consider milliliter-marked droppers for repeatable measures.