Convert Imperial Gallon to Imperial Quart
Convert imperial gallons to imperial quarts instantly. 1 imperial gallon = 4 imperial quart — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Quart to Imperial Gallon converter for the reverse conversion.
Units explained
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
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 to Imperial Quart conversion formula
The relationship between imperial gallons and imperial quarts:
To convert imperial gallons to imperial quarts, multiply the value in imperial gallons by 4. To reverse, multiply imperial quarts by 0.25.
How to use this converter
Type a value into the calculator. The result in imperial quarts 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 Quart to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to imperial quarts
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 4.
- The product is the equivalent value in imperial quarts (qt).
- To reverse, multiply the imperial quart value by 0.25.
Worked examples
Example 1 — Convert 1 gal to qt:
1 × 4 = 4 qt
Example 2 — Convert 100 gal to qt:
100 × 4 = 400 qt
Real-world example — Hardware-scale dimensions
A 10-imperial gallon fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between imperial gallons and imperial quarts daily when mixing metric and imperial tools.
10 gal × 4 = 40 qt
Real-world example — Postcard and small-object dimensions
A postcard is about 5 imperial gallons wide. Converting to imperial quarts is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 gal × 4 = 20 qt
Real-world example — Ruler-scale measurements
A 30-imperial gallon school ruler converts cleanly to imperial quarts — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 gal × 4 = 120 qt
Imperial Gallon to Imperial Quart conversion table
Standard reference values for converting imperial gallons to imperial quarts:
| Imperial Gallon [gal] | Imperial Quart [qt] |
|---|---|
| 0.01 | 0.04 |
| 0.1 | 0.4 |
| 1 | 4 |
| 2 | 8 |
| 3 | 12 |
| 4 | 16 |
| 5 | 20 |
| 10 | 40 |
| 20 | 80 |
| 30 | 120 |
| 40 | 160 |
| 50 | 200 |
| 100 | 400 |
| 500 | 2000 |
| 1000 | 4000 |
Frequently asked questions
How many imperial quarts is 1 imperial gallon?
How do I convert imperial gallons to imperial quarts?
How do I convert imperial quarts back to imperial gallons?
How many imperial quarts is 100 imperial gallons?
Popular volume unit conversions
Convert Imperial Gallon to other volume units
Show all Imperial Gallon conversions
Metric / SI (15 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (13 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 4 qt) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.