UK Gallons to US Quarts (imp gal to qt) Converter
1 UK gallon (imp gal) = 4.8038 US quarts (qt). To convert UK gallons to US quarts, multiply by 4.8038: 25 imp gal × 4.8038 = 120.095 qt.
Quick facts
- 1 imp gal = 4.8038 qt
- 1 qt = 0.208169 imp gal
- Formula: qt = imp gal × 4.8038
- Quick estimate: multiply by about 4.8
How to convert UK gallons to US quarts
- Write down the number of UK gallons you have.
- Multiply it by 4.8038 (the number of US quarts in one UK gallon).
- Round the answer to a sensible number of decimal places.
Worked example: 25 imp gal × 4.8038 = 120.095 qt.
To convert US quarts back to UK gallons, multiply by 0.208169, or divide by 4.8038.
Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).
UK Gallons to US Quarts conversion table
| UK Gallons [imp gal] | US Quarts [qt] |
|---|---|
| 0.01 imp gal | 0.048037997 qt |
| 0.1 imp gal | 0.4803799702 qt |
| 1 imp gal | 4.803799702 qt |
| 2 imp gal | 9.607599404 qt |
| 3 imp gal | 14.4113991061 qt |
| 5 imp gal | 24.0189985101 qt |
| 10 imp gal | 48.0379970202 qt |
| 20 imp gal | 96.0759940404 qt |
| 50 imp gal | 240.189985101 qt |
| 100 imp gal | 480.3799702019 qt |
| 1000 imp gal | 4803.7997020194 qt |
imp gal to qt chart from 1 to 100
- 1 imp gal 4.8038 qt
- 2 imp gal 9.6076 qt
- 3 imp gal 14.4114 qt
- 4 imp gal 19.2152 qt
- 5 imp gal 24.019 qt
- 6 imp gal 28.8228 qt
- 7 imp gal 33.6266 qt
- 8 imp gal 38.4304 qt
- 9 imp gal 43.2342 qt
- 10 imp gal 48.038 qt
- 11 imp gal 52.8418 qt
- 12 imp gal 57.6456 qt
- 13 imp gal 62.4494 qt
- 14 imp gal 67.2532 qt
- 15 imp gal 72.057 qt
- 16 imp gal 76.8608 qt
- 17 imp gal 81.6646 qt
- 18 imp gal 86.4684 qt
- 19 imp gal 91.2722 qt
- 20 imp gal 96.076 qt
- 25 imp gal 120.095 qt
- 30 imp gal 144.114 qt
- 35 imp gal 168.133 qt
- 40 imp gal 192.152 qt
- 45 imp gal 216.171 qt
- 50 imp gal 240.19 qt
- 55 imp gal 264.209 qt
- 60 imp gal 288.228 qt
- 65 imp gal 312.247 qt
- 70 imp gal 336.266 qt
- 75 imp gal 360.285 qt
- 80 imp gal 384.304 qt
- 85 imp gal 408.323 qt
- 90 imp gal 432.342 qt
- 95 imp gal 456.361 qt
- 100 imp gal 480.38 qt
US Quarts to UK Gallons conversion table
| US Quarts [qt] | UK Gallons [imp gal] |
|---|---|
| 0.01 qt | 0.0020816855 imp gal |
| 0.1 qt | 0.0208168546 imp gal |
| 1 qt | 0.2081685462 imp gal |
| 2 qt | 0.4163370923 imp gal |
| 3 qt | 0.6245056385 imp gal |
| 5 qt | 1.0408427308 imp gal |
| 10 qt | 2.0816854616 imp gal |
| 20 qt | 4.1633709231 imp gal |
| 50 qt | 10.4084273079 imp gal |
| 100 qt | 20.8168546157 imp gal |
| 1000 qt | 208.1685461572 imp gal |
UK Gallons vs US Quarts
| UK Gallon | US Quart | |
|---|---|---|
| Symbol | imp gal | qt |
| Equals | 1 imp gal = 4.8038 qt | 1 qt = 0.208169 imp gal |
What is a UK gallon?
The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.
What is a US quart?
A US customary unit equal to 2 pints or 1/4 gallon. Used in the US for milk, motor oil, and cooking.
Who Converts UK Gallons to US Quarts?
UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes, while US quarts are used mainly in the United States. This conversion bridges the US customary and metric systems, so it comes up whenever a figure crosses the US border with Canada or the Atlantic with the UK: product specifications, travel, recipes, school work and trade.
How big is 1 imp gal compared with 1 qt?
1 imp gal is 4.8038 times the size of 1 qt, so the number gets bigger when you convert UK gallons to US quarts.
UK Gallons to US Quarts without a calculator
- In your head: multiply by 5 (about 4.1% off). 1 imp gal × 5 ≈ 5 qt.
- Closer estimate: multiply by 4.8 (within 0.079%).
- Fraction trick: multiply by 24, then divide by 5 (within 0.079%).
Real-world imp gal to qt examples
| Example | UK Gallons | US Quarts |
|---|---|---|
| One imperial gallon | 1 imp gal | 4.8038 qt |
| A small aquarium | 10 imp gal | 48.038 qt |
| A garden water butt | 45 imp gal | 216.171 qt |
| A quart of milk | 0.208169 imp gal | 1 qt |
| An engine oil change | 1.04084 imp gal | 5 qt |
How exact is the imp gal to qt factor?
The factor is exact by definition, so any error comes only from rounding. Keep at least 4 significant figures for school work, and the full factor for anything legal or commercial.
Mistakes to avoid
- US and imperial (UK) measures share names but not sizes. Check which one a recipe, label or fuel figure uses before converting.
Background on UK gallons and US quarts
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
Related conversions
People who convert uk gallons to us quarts often need us gallons to us quarts, uk gallons to uk quarts, us quarts to liters and uk gallons to liters. The full volume converter lists every unit.
On pakmath.com, the scientific calculator is a useful next step; Adzita offers a free fuel cost calculator.
Frequently asked questions
How many US quarts are in a UK gallon?
There are 4.8038 US quarts in 1 UK gallon (1 imp gal = 4.803799702 qt).
How many UK gallons are in a US quart?
There are 0.208169 UK gallons in 1 US quart (1 qt = 0.2081685462 imp gal).
How do I convert UK gallons to US quarts?
Multiply by 4.8038, or divide by 0.208169 if that is easier. Example: 10 imp gal = 48.038 qt.
What is 10 imp gal in US quarts?
10 imp gal = 48.038 qt.
What is 100 imp gal in US quarts?
100 imp gal = 480.38 qt.
Is the conversion exact?
Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.
What is an easy way to convert UK gallons to US quarts?
In your head: multiply by 5 (about 4.1% off). 1 imp gal × 5 ≈ 5 qt.
How many US quarts is 1 imp gal (one imperial gallon)?
1 imp gal = 4.8038 qt.
How many UK gallons is a quart of milk (1 qt)?
1 qt = 0.208169 imp gal.
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