Converter
Single value. Batch input below.
Modern UK uses metric in practice.
Numbers only. We'll ignore blanks and invalid entries.
CSV exports the results table. PDF captures the results section.
Results
| # | Input value | From unit | To unit | Factor | Output value |
|---|
Factors used (mL per teaspoon): US 4.92892159375; Metric 5; Imperial 5.91938802083333.
Convert 1 teaspoon to milliliters
Quick reference for one teaspoon across standards. Uses your current Decimals and Rounding settings.
| Standard | Definition (mL per tsp) | 1 tsp in mL | Action |
|---|
Teaspoon standards and exact factors
Compare definitions across systems. Values use your current decimals and rounding.
| Standard | mL per teaspoon | teaspoons per mL | Notes |
|---|
Quick reference: teaspoons → milliliters chart
Handy lookups based on the selected standard.
| Teaspoons (tsp) | Tablespoons (tbsp) | Milliliters (mL) |
|---|
Example data table
| Measure | Teaspoons | US mL | Metric mL | Imperial mL |
|---|---|---|---|---|
| ¼ teaspoon | 0.25 | 1.232230 | 1.25 | 1.479847 |
| ½ teaspoon | 0.5 | 2.464461 | 2.5 | 2.959694 |
| 1 teaspoon | 1 | 4.928922 | 5 | 5.919388 |
| 1½ teaspoons | 1.5 | 7.393383 | 7.5 | 8.879082 |
| 2 teaspoons | 2 | 9.857843 | 10 | 11.838776 |
Rounded to 6 decimals for display.
Formula used
Teaspoons → Milliliters: mL = tsp × k
Milliliters → Teaspoons: tsp = mL ÷ k
Where k is the conversion factor for the selected standard:
- US teaspoon: k = 4.92892159375 mL
- Metric teaspoon: k = 5 mL
- Imperial teaspoon: k = 5.91938802083333 mL
Note: Modern UK culinary practice typically uses the 5 mL metric teaspoon.
How to convert teaspoons to milliliters
- Select the teaspoon Standard you need (US, metric, imperial).
- Use the factor k for that standard (mL per tsp).
- Multiply teaspoons by k: mL = tsp × k.
- Round to your chosen number of decimals if required.
Worked example
Example uses US standard and tsp = 2.75.
mL = 2.75 × 4.92892159375 = 13.55 mL
Updates automatically when you change standard, decimals, or rounding.
How to use this calculator
- Enter a Value or paste multiple values in Batch values.
- Choose the Direction and the teaspoon Standard.
- Select desired Decimals and Rounding behavior.
- Click Convert to populate the results table.
- Use Download CSV or Download PDF to export.
FAQs
Historic systems differ: US customary, metric, and imperial. Many countries, including the UK, now standardize recipes to the metric 5 mL teaspoon.
Use the standard expected by your recipe source. Most modern recipes outside the US assume 5 mL per teaspoon.
Mathematically precise given chosen factors and rounding. Practical measuring spoons may vary slightly; use appropriate precision for cooking or lab needs.
Yes. Switch the direction to “Milliliters → Teaspoons.” The calculator will divide by the selected standard’s factor.
Paste values separated by spaces, commas, or new lines. Click Convert; each valid number generates a row in the results table.