US Teaspoons to Milliliters Converter
Convert US teaspoons to milliliters instantly with this free US teaspoons to milliliters converter. Enter any value to get an accurate volume conversion, plus the formula, the conversion factor and a full reference table.
What is 1 US teaspoon in milliliters?
1 US teaspoon is equal to 4.92892159 milliliters.
1 × 4.92892159 = 4.92892159 milliliters
1 US teaspoon = 4.928921594 milliliters
US teaspoons to Milliliters formula
mL = tsp × 4.92892159
The US teaspoons to milliliters conversion factor is 4.92892159375, which is exact by definition. 1 US teaspoon = 4.92892159375 milliliters, and 1 milliliter = 0.202884136211 US teaspoons.
Worked examples
- 2 US teaspoons = 9.85784319 milliliters — 2 × 4.92892159 = 9.85784319 milliliters
- 6 US teaspoons = 29.5735296 milliliters — 6 × 4.92892159 = 29.5735296 milliliters
- 10 US teaspoons = 49.2892159 milliliters — 10 × 4.92892159 = 49.2892159 milliliters
US teaspoons to Milliliters conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| US teaspoons (tsp) | Milliliters (mL) |
|---|---|
| 1 tsp | 4.9289216 mL |
| 2 tsp | 9.8578432 mL |
| 3 tsp | 14.786765 mL |
| 4 tsp | 19.715686 mL |
| 5 tsp | 24.644608 mL |
| 6 tsp | 29.57353 mL |
| 7 tsp | 34.502451 mL |
| 8 tsp | 39.431373 mL |
| 9 tsp | 44.360294 mL |
| 10 tsp | 49.289216 mL |
| 12 tsp | 59.147059 mL |
| 15 tsp | 73.933824 mL |
| 20 tsp | 98.578432 mL |
| 25 tsp | 123.22304 mL |
| 30 tsp | 147.86765 mL |
| 50 tsp | 246.44608 mL |
| 75 tsp | 369.66912 mL |
| 100 tsp | 492.89216 mL |
| 500 tsp | 2,464.4608 mL |
| 1,000 tsp | 4,928.9216 mL |
When you need to convert US teaspoons to milliliters
- Scaling recipes between metric millilitres and US cups, pints or fluid ounces.
- Comparing fuel prices and tank capacities between countries.
- Working out paint, fertiliser or pool chemical quantities from instructions written for another market.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
Milliliter (mL)
- A teaspoon is about 5 mL
- A shot of espresso is roughly 30 mL
Common mistakes to avoid
- Dividing when you should multiply. Because 1 US teaspoon = 4.92892 milliliters, the answer should be larger than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Cooking tolerates rounding to the nearest 5 mL or quarter cup. Dosing, chemistry and pool treatment do not — keep the full converted value there.
How these units are defined
- US teaspoon (tsp): One third of a US tablespoon, about 4.93 mL. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Milliliter (mL): One thousandth of a liter, equal to one cubic centimeter. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
- Milliliters to US teaspoons
- US teaspoons to Liters
- US teaspoons to Cubic meters
- US teaspoons to Cubic feet
- US teaspoons to US tablespoons
- US teaspoons to US fluid ounces
- US teaspoons to US cups
- US teaspoons to US liquid pints
- US teaspoons to US liquid quarts
- US teaspoons to US liquid gallons
- US teaspoons to Imperial pints
- US teaspoons to Imperial gallons
Frequently asked questions
- What is 1 US teaspoon in milliliters?
- 1 US teaspoon is equal to 4.92892159 milliliters.
- How many US teaspoons are in one milliliter?
- There are 0.202884136 US teaspoons in 1 milliliter.
- How do you convert US teaspoons to milliliters?
- Multiply the number of US teaspoons by 4.92892159 — or use the formula mL = tsp × 4.92892159.
- What is 6 US teaspoons in milliliters?
- 6 US teaspoons is 29.5735296 milliliters. 6 × 4.92892159 = 29.5735296 milliliters.
- Is the US teaspoons to milliliters conversion exact?
- Yes. The relationship is fixed by definition, so 4.92892159375 is an exact conversion factor — only the displayed result is rounded.