A US liquid gallon is exactly 3.785411784 liters.
Gallons to Teaspoons Converter — gal to tsp
Convert Gallon (gal) to Teaspoon (tsp) using the exact conversion factor (1 gallon = 768 teaspoon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Gallons to Teaspoons 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 US teaspoon is one third of a US tablespoon.
Result = input x 0.003785411784 / 4.92892159e-6.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gallons to Teaspoons
Gallon and Teaspoon 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. Gallon is typically associated with united States (fuel, beverage, and liquid measurement), while Teaspoon is typically associated with united States (cooking and recipe measurement).
Formula
teaspoons = gallons × 768
This factor comes from each unit's defined relationship to the category's base unit: 1 gallon equals 0.003785411784 base units, and 1 teaspoon equals 0.00000492892159375 base units, so dividing one by the other gives the direct gallon-to-teaspoon factor of 768.
Simple example
1 gal × 768 = 768 tsp
1 gallon = 768 teaspoons.
Real-world example
10 gal × 768 = 7,680 tsp
10 gallons = 7,680 teaspoons.
Conversion table
| Gallon (gal) | Teaspoon (tsp) |
|---|---|
| 1 gal | 768 tsp |
| 5 gal | 3,840 tsp |
| 10 gal | 7,680 tsp |
| 25 gal | 19,200 tsp |
| 50 gal | 38,400 tsp |
| 100 gal | 76,800 tsp |
Reverse conversion: Teaspoon to Gallon
768 tsp × 0.001302083333 = 1 gal
768 teaspoons = 1 gallons.
gallons = teaspoons × 0.00130208333333
For a page dedicated to this direction, see Teaspoon to Gallon.
Gallon vs. Teaspoon
| Aspect | Gallon | Teaspoon |
|---|---|---|
| Family | US customary unit | US customary unit |
| Typical use | Fuel pump and vehicle fuel-economy measurement in the US | US recipe and cooking measurement for small quantities |
| Where it's used | United States (fuel, beverage, and liquid measurement) | United States (cooking and recipe measurement) |
Understanding the Gallon
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
Where it's used: United States (fuel, beverage, and liquid measurement)
US gallon vs. imperial gallon. The US liquid gallon (3.785411784 L) and the British imperial gallon (4.54609 L) are different units with the same name; always confirm which one a source is using.
Uses of the Gallon today
- Fuel pump and vehicle fuel-economy measurement in the US
- Beverage and liquid product packaging in the US
- Cooking and recipe measurement in US customary units
History of the Gallon
The US gallon descends from the English wine gallon of 231 cubic inches, a standard used for measuring wine in medieval and early modern England, which the American colonies inherited and retained even after England moved to a different imperial gallon in 1824.
England's 1824 Weights and Measures Act replaced the old wine gallon with a new imperial gallon (based on 10 pounds of water), but the US kept the older 231-cubic-inch definition — which is why the US gallon (3.785 L) and the imperial gallon (4.546 L) differ by about 20% today.
Historical origin. Gallon was not the invention of a single named person; it developed through the process described above.
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
Gallon — sources
- NIST Handbook 44, Appendix C — General tables of units of measurement, including the US gallon definition.
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many teaspoons are in 1 gallon?
1 gallon equals 768 teaspoons, using the exact defined conversion factor rather than an estimate.
How do I convert gallon to teaspoon?
Multiply the gallon value by 768. The converter above does this instantly to whatever precision you set.
How do I convert teaspoon back to gallon?
Use the reverse factor: 1 teaspoon equals 0.0013020833 gallons. You can also use the swap control in the converter above to flip the direction instantly.
What is a gallon?
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
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.
Is the gallon to teaspoon conversion exact?
Yes. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between us gallon vs. imperial gallon?
The US liquid gallon (3.785411784 L) and the British imperial gallon (4.54609 L) are different units with the same name; always confirm which one a source is using.
Where is the gallon still used today?
United States (fuel, beverage, and liquid measurement)