Convert Imperial Quart to Imperial Gallon
Convert imperial quarts to imperial gallons instantly. 1 imperial quart = 0.25 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Imperial Quart converter for the reverse conversion.
Units explained
Imperial Quart
An imperial quart is one quarter of an imperial gallon (1.13652 L).
A subdivision of the 1824 imperial gallon.
Used in the UK and Commonwealth.
UK, 1824.
Imperial Gallon
The imperial gallon is defined as exactly 4.54609 liters.
Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.
Used for fuel and beverages in the UK and Commonwealth.
UK, 1824.
Imperial Quart to Imperial Gallon conversion formula
The relationship between imperial quarts and imperial gallons:
To convert imperial quarts to imperial gallons, multiply the value in imperial quarts by 0.25. To reverse, multiply imperial gallons by 4.
How to use this converter
Type a value into the calculator. The result in imperial gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Imperial Gallon to Imperial Quart converter for the reverse direction.
Step-by-step: convert imperial quarts to imperial gallons
- Write down the value in imperial quarts (qt).
- Multiply that value by the factor 0.25.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 4.
Worked examples
Example 1 — Convert 1 qt to gal:
1 × 0.25 = 0.25 gal
Example 2 — Convert 100 qt to gal:
100 × 0.25 = 25 gal
Real-world example — Hardware-scale dimensions
A 10-imperial quart fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between imperial quarts and imperial gallons daily when mixing metric and imperial tools.
10 qt × 0.25 = 2.5 gal
Real-world example — Postcard and small-object dimensions
A postcard is about 5 imperial quarts wide. Converting to imperial gallons is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 qt × 0.25 = 1.25 gal
Real-world example — Ruler-scale measurements
A 30-imperial quart school ruler converts cleanly to imperial gallons — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 qt × 0.25 = 7.5 gal
Imperial Quart to Imperial Gallon conversion table
Standard reference values for converting imperial quarts to imperial gallons:
| Imperial Quart [qt] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 0.0025 |
| 0.1 | 0.025 |
| 1 | 0.25 |
| 2 | 0.5 |
| 3 | 0.75 |
| 4 | 1 |
| 5 | 1.25 |
| 10 | 2.5 |
| 20 | 5 |
| 30 | 7.5 |
| 40 | 10 |
| 50 | 12.5 |
| 100 | 25 |
| 500 | 125 |
| 1000 | 250 |
Frequently asked questions
How many imperial gallons is 1 imperial quart?
How do I convert imperial quarts to imperial gallons?
How do I convert imperial gallons back to imperial quarts?
How many imperial gallons is 100 imperial quarts?
Popular volume unit conversions
Convert Imperial Quart to other volume units
Show all Imperial Quart conversions
Metric / SI (8 units)
US Customary (Liquid) (8 units)
Imperial (UK) (3 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 qt = 0.25 gal) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.