Convert Imperial Quart to US Gallon
Convert imperial quarts to us gallons instantly. 1 imperial quart = 0.3002374814 us gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US 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.
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Imperial Quart to US Gallon conversion formula
The relationship between imperial quarts and us gallons:
To convert imperial quarts to us gallons, multiply the value in imperial quarts by 0.3002374814. To reverse, multiply us gallons by 3.3306967385.
How to use this converter
Type a value into the calculator. The result in us 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 US Gallon to Imperial Quart converter for the reverse direction.
Step-by-step: convert imperial quarts to us gallons
- Write down the value in imperial quarts (qt).
- Multiply that value by the factor 0.3002374814.
- The product is the equivalent value in us gallons (gal).
- To reverse, multiply the us gallon value by 3.3306967385.
Worked examples
Example 1 — Convert 1 qt to gal:
1 × 0.3002374814 = 0.3002374814 gal
Example 2 — Convert 100 qt to gal:
100 × 0.3002374814 = 30.0237481376 gal
Real-world example — Postcard and small-object dimensions
A postcard is about 5 imperial quarts wide. Converting to us gallons is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 qt × 0.3002374814 = 1.5011874069 gal
Real-world example — Ruler-scale measurements
A 30-imperial quart school ruler converts cleanly to us gallons — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 qt × 0.3002374814 = 9.0071244413 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 us gallons daily when mixing metric and imperial tools.
10 qt × 0.3002374814 = 3.0023748138 gal
Imperial Quart to US Gallon conversion table
Standard reference values for converting imperial quarts to us gallons:
| Imperial Quart [qt] | US Gallon [gal] |
|---|---|
| 0.01 | 0.0030023748 |
| 0.1 | 0.0300237481 |
| 1 | 0.3002374814 |
| 2 | 0.6004749628 |
| 3 | 0.9007124441 |
| 4 | 1.2009499255 |
| 5 | 1.5011874069 |
| 10 | 3.0023748138 |
| 20 | 6.0047496275 |
| 30 | 9.0071244413 |
| 40 | 12.009499255 |
| 50 | 15.0118740688 |
| 100 | 30.0237481376 |
| 500 | 150.1187406881 |
| 1000 | 300.2374813762 |
Frequently asked questions
How many us gallons is 1 imperial quart?
How do I convert imperial quarts to us gallons?
How do I convert us gallons back to imperial quarts?
How many us gallons is 100 imperial quarts?
Popular volume unit conversions
Convert Imperial Quart to other volume units
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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 = 0.3002374814 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 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.