A US teaspoon is one third of a US tablespoon.
Teaspoons to Liters Converter — tsp to L
Convert Teaspoon (tsp) to Liter (L) using the exact conversion factor (1 teaspoon = 0.0049289216 liter). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Teaspoons to Liters converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
A liter is one cubic decimeter.
Result = input x 4.92892159e-6 / 0.001.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Teaspoons to Liters
Teaspoon and Liter appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Teaspoon is typically associated with united States (cooking and recipe measurement), while Liter is typically associated with standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts.
Formula
liters = teaspoons × 0.00492892159375
This factor comes from each unit's defined relationship to the category's base unit: 1 teaspoon equals 0.00000492892159375 base units, and 1 liter equals 0.001 base units, so dividing one by the other gives the direct teaspoon-to-liter factor of 0.00492892159375.
Simple example
1 tsp × 0.004928921594 = 0.0049289216 L
1 teaspoon = 0.0049289216 liters.
Real-world example
10 tsp × 0.004928921594 = 0.0492892159 L
10 teaspoons = 0.0492892159 liters.
Conversion table
| Teaspoon (tsp) | Liter (L) |
|---|---|
| 1 tsp | 0.0049289216 L |
| 5 tsp | 0.024644608 L |
| 10 tsp | 0.0492892159 L |
| 25 tsp | 0.1232230398 L |
| 50 tsp | 0.2464460797 L |
| 100 tsp | 0.4928921594 L |
Reverse conversion: Liter to Teaspoon
0.0049289216 L × 202.8841362 = 1.000000001 tsp
0.0049289216 liters = 1.000000001 teaspoons.
teaspoons = liters × 202.884136211
For a page dedicated to this direction, see Liter to Teaspoon.
Teaspoon vs. Liter
| Aspect | Teaspoon | Liter |
|---|---|---|
| Family | US customary unit | Non-SI metric unit accepted for use with SI |
| Typical use | US recipe and cooking measurement for small quantities | Beverage, fuel, and liquid product packaging worldwide |
| Where it's used | United States (cooking and recipe measurement) | Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts |
Understanding the Teaspoon
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Where it's used: United States (cooking and recipe measurement)
Uses of the Teaspoon today
- US recipe and cooking measurement for small quantities
- Medication dosing instructions in the US
- Baking measurement alongside the tablespoon and cup
Understanding the Liter
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Where it's used: Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts
Uses of the Liter today
- Beverage, fuel, and liquid product packaging worldwide
- Cooking and recipe measurement in metric countries
- Laboratory and scientific volume measurement
History of the Liter
The liter was introduced with the French metric system in 1795, originally defined as the volume of one kilogram of pure water at its freezing point — tying volume, mass, and the meter together.
Between 1901 and 1964, the liter was briefly redefined as the volume of exactly one kilogram of water at its maximum density (about 4 °C), which made it very slightly larger than a cubic decimeter. It was redefined back to exactly one cubic decimeter in 1964, the definition still used today.
Historical origin. Liter was not the invention of a single named person; it developed through the process described above.
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Liter — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Current cubic-decimeter definition of the liter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many liters are in 1 teaspoon?
1 teaspoon equals 0.0049289216 liters, using the exact defined conversion factor rather than an estimate.
How do I convert teaspoon to liter?
Multiply the teaspoon value by 0.004928921594. The converter above does this instantly to whatever precision you set.
How do I convert liter back to teaspoon?
Use the reverse factor: 1 liter equals 202.8841362 teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a teaspoon?
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
What is a liter?
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Is the teaspoon to liter conversion exact?
Yes. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the teaspoon still used today?
United States (cooking and recipe measurement)