A metric teaspoon is 5 milliliters.
Metric teaspoons to Imperial gallons Converter — metric tsp to imp gal
Convert Metric teaspoon (metric tsp) to Imperial gallon (imp gal) using the exact conversion factor (1 metric teaspoon = 0.0010998462 imperial gallon). See the formula, worked examples, conversion table, history, and common uses.
Metric 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 5e-6 / 0.00454609.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Metric teaspoons to Imperial gallons
Metric 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. Specifically: A metric teaspoon is 5 milliliters, and an imperial gallon is exactly 4.54609 liters.
Formula
imperial gallons = metric teaspoons × 0.0010998462415
This factor comes from each unit's defined relationship to the category's base unit: 1 metric teaspoon equals 0.000005 base units, and 1 imperial gallon equals 0.00454609 base units, so dividing one by the other gives the direct metric teaspoon-to-imperial gallon factor of 0.0010998462415.
Simple example
1 metric tsp × 0.001099846241 = 0.0010998462 imp gal
1 metric teaspoon = 0.0010998462 imperial gallons.
Real-world example
10 metric tsp × 0.001099846241 = 0.0109984624 imp gal
10 metric teaspoons = 0.0109984624 imperial gallons.
Conversion table
| Metric teaspoon (metric tsp) | Imperial gallon (imp gal) |
|---|---|
| 1 metric tsp | 0.0010998462 imp gal |
| 5 metric tsp | 0.0054992312 imp gal |
| 10 metric tsp | 0.0109984624 imp gal |
| 25 metric tsp | 0.027496156 imp gal |
| 50 metric tsp | 0.0549923121 imp gal |
| 100 metric tsp | 0.1099846241 imp gal |
Reverse conversion: Imperial gallon to Metric teaspoon
0.0010998462 imp gal × 909.218 = 0.9999999623 metric tsp
0.0010998462 imperial gallons = 0.9999999623 metric teaspoons.
metric teaspoons = imperial gallons × 909.218
For a page dedicated to this direction, see Imperial gallon to Metric teaspoon.
Understanding the Metric teaspoon (metric tsp)
A metric teaspoon is 5 milliliters.
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.
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 metric teaspoon?
1 metric teaspoon equals 0.0010998462 imperial gallons, using the exact defined conversion factor rather than an estimate.
How do I convert metric teaspoon to imperial gallon?
Multiply the metric teaspoon value by 0.001099846241. The converter above does this instantly to whatever precision you set.
How do I convert imperial gallon back to metric teaspoon?
Use the reverse factor: 1 imperial gallon equals 909.218 metric teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a metric teaspoon?
Metric teaspoon (metric tsp) is a unit of volume.
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 metric 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.