A US teaspoon is one third of a US tablespoon.
Teaspoons to Imperial gallons Converter — tsp to imp gal
Convert Teaspoon (tsp) to Imperial gallon (imp gal) using the exact conversion factor (1 teaspoon = 0.0010842112 imperial gallon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Teaspoons to Imperial gallons 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.
An imperial gallon is exactly 4.54609 liters.
Result = input x 4.92892159e-6 / 0.00454609.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Teaspoons to Imperial gallons
Teaspoon and Imperial gallon 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 Imperial gallon is typically associated with united Kingdom, Canada (some contexts), and other Commonwealth countries.
Formula
imperial gallons = teaspoons × 0.0010842111779
This factor comes from each unit's defined relationship to the category's base unit: 1 teaspoon equals 0.00000492892159375 base units, and 1 imperial gallon equals 0.00454609 base units, so dividing one by the other gives the direct teaspoon-to-imperial gallon factor of 0.0010842111779.
Simple example
1 tsp × 0.001084211178 = 0.0010842112 imp gal
1 teaspoon = 0.0010842112 imperial gallons.
Real-world example
10 tsp × 0.001084211178 = 0.0108421118 imp gal
10 teaspoons = 0.0108421118 imperial gallons.
Conversion table
| Teaspoon (tsp) | Imperial gallon (imp gal) |
|---|---|
| 1 tsp | 0.0010842112 imp gal |
| 5 tsp | 0.0054210559 imp gal |
| 10 tsp | 0.0108421118 imp gal |
| 25 tsp | 0.0271052795 imp gal |
| 50 tsp | 0.0542105589 imp gal |
| 100 tsp | 0.1084211178 imp gal |
Reverse conversion: Imperial gallon to Teaspoon
0.0010842112 imp gal × 922.3295428 = 1.00000002 tsp
0.0010842112 imperial gallons = 1.00000002 teaspoons.
teaspoons = imperial gallons × 922.329542788
For a page dedicated to this direction, see Imperial gallon to Teaspoon.
Teaspoon vs. Imperial gallon
| Aspect | Teaspoon | Imperial gallon |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | US recipe and cooking measurement for small quantities | UK fuel and beverage measurement (historically; UK now primarily uses liters for retail) |
| Where it's used | United States (cooking and recipe measurement) | United Kingdom, Canada (some contexts), and other Commonwealth countries |
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 Imperial gallon
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom, Canada (some contexts), and other Commonwealth countries
Imperial gallon vs. US gallon. Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Uses of the Imperial gallon today
- UK fuel and beverage measurement (historically; UK now primarily uses liters for retail)
- Commonwealth country liquid measurement in some contexts
History of the Imperial gallon
The imperial gallon was created by Britain's Weights and Measures Act of 1824, defined as the volume of 10 pounds of water, replacing several inconsistent older English gallon definitions (wine gallon, ale gallon, corn gallon) with one standard.
Historical origin. Imperial gallon 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.
Imperial gallon — sources
- UK Weights and Measures Act 1824 — Establishes the imperial gallon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial gallons are in 1 teaspoon?
1 teaspoon equals 0.0010842112 imperial gallons, using the exact defined conversion factor rather than an estimate.
How do I convert teaspoon to imperial gallon?
Multiply the teaspoon value by 0.001084211178. The converter above does this instantly to whatever precision you set.
How do I convert imperial gallon back to teaspoon?
Use the reverse factor: 1 imperial gallon equals 922.3295428 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 imperial gallon?
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Is the teaspoon to imperial gallon conversion exact?
Yes. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. 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 imperial gallon vs. us gallon?
Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Where is the teaspoon still used today?
United States (cooking and recipe measurement)