Convert Imperial Gallon to US Quart
Convert imperial gallons to us quarts instantly. 1 imperial gallon = 4.803799702 us quart — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US 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.
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 to US Quart conversion formula
The relationship between imperial gallons and us quarts:
To convert imperial gallons to us quarts, multiply the value in imperial gallons by 4.803799702. To reverse, multiply us quarts by 0.2081685462.
How to use this converter
Type a value into the calculator. The result in us 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 US Quart to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to us quarts
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 4.803799702.
- The product is the equivalent value in us quarts (qt).
- To reverse, multiply the us quart value by 0.2081685462.
Worked examples
Example 1 — Convert 1 gal to qt:
1 × 4.803799702 = 4.803799702 qt
Example 2 — Convert 100 gal to qt:
100 × 4.803799702 = 480.3799702019 qt
Real-world example — Adjacent metric sub-units
One imperial gallon equals 1,000 us quarts. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 gal × 4.803799702 = 4.803799702 qt
Real-world example — Adjacent small-scale precision
One imperial gallon equals 1,000 us quarts — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 gal × 4.803799702 = 4.803799702 qt
Imperial Gallon to US Quart conversion table
Standard reference values for converting imperial gallons to us quarts:
| Imperial Gallon [gal] | US Quart [qt] |
|---|---|
| 0.01 | 0.048037997 |
| 0.1 | 0.4803799702 |
| 1 | 4.803799702 |
| 2 | 9.607599404 |
| 3 | 14.4113991061 |
| 4 | 19.2151988081 |
| 5 | 24.0189985101 |
| 10 | 48.0379970202 |
| 20 | 96.0759940404 |
| 30 | 144.1139910606 |
| 40 | 192.1519880808 |
| 50 | 240.189985101 |
| 100 | 480.3799702019 |
| 500 | 2401.8998510097 |
| 1000 | 4803.7997020194 |
Frequently asked questions
How many us quarts is 1 imperial gallon?
How do I convert imperial gallons to us quarts?
How do I convert us quarts back to imperial gallons?
How many us quarts is 100 imperial gallons?
Popular volume unit conversions
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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 = 4.803799702 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 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.