Convert US Quart to Imperial Gallon
Convert us quarts to imperial gallons instantly. 1 us quart = 0.2081685462 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to US Quart converter for the reverse conversion.
Units explained
US Quart
A US liquid quart is one quarter of a US gallon (0.946352946 L).
From the Latin quartus, a quarter of a gallon.
Used for milk, oil and household liquids in the US.
English customary.
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.
US Quart to Imperial Gallon conversion formula
The relationship between us quarts and imperial gallons:
To convert us quarts to imperial gallons, multiply the value in us quarts by 0.2081685462. To reverse, multiply imperial gallons by 4.803799702.
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 US Quart converter for the reverse direction.
Step-by-step: convert us quarts to imperial gallons
- Write down the value in us quarts (qt).
- Multiply that value by the factor 0.2081685462.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 4.803799702.
Worked examples
Example 1 — Convert 1 qt to gal:
1 × 0.2081685462 = 0.2081685462 gal
Example 2 — Convert 100 qt to gal:
100 × 0.2081685462 = 20.8168546157 gal
Real-world example — Packaging gauge
A 4-us quart plastic bag thickness is a common spec for grocery and freezer bags. Converting from us quarts to imperial gallons is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 qt × 0.2081685462 = 0.8326741846 gal
Real-world example — Plastic film and laminate thickness
A 500-us quart sheet is a typical spec for ID-card laminates and film overlays. Converting to imperial gallons aligns the value with the unit most CAD systems and material datasheets prefer.
500 qt × 0.2081685462 = 104.0842730786 gal
US Quart to Imperial Gallon conversion table
Standard reference values for converting us quarts to imperial gallons:
| US Quart [qt] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 0.0020816855 |
| 0.1 | 0.0208168546 |
| 1 | 0.2081685462 |
| 2 | 0.4163370923 |
| 3 | 0.6245056385 |
| 4 | 0.8326741846 |
| 5 | 1.0408427308 |
| 10 | 2.0816854616 |
| 20 | 4.1633709231 |
| 30 | 6.2450563847 |
| 40 | 8.3267418463 |
| 50 | 10.4084273079 |
| 100 | 20.8168546157 |
| 500 | 104.0842730786 |
| 1000 | 208.1685461572 |
Frequently asked questions
How many imperial gallons is 1 us quart?
How do I convert us quarts to imperial gallons?
How do I convert imperial gallons back to us quarts?
How many imperial gallons is 100 us quarts?
Popular volume unit conversions
Convert US Quart to other volume units
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Metric / SI (8 units)
US Customary (Liquid) (7 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 qt = 0.2081685462 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.