US Quarts to UK Gallons (qt to imp gal) Converter
1 US quart (qt) = 0.208169 UK gallons (imp gal). To convert US quarts to UK gallons, multiply by 0.208169: 25 qt × 0.208169 = 5.20421 imp gal.
Quick facts
- 1 qt = 0.208169 imp gal
- 1 imp gal = 4.8038 qt
- Formula: imp gal = qt × 0.208169
- Quick estimate: multiply by about 0.21
How to convert US quarts to UK gallons
- Write down the number of US quarts you have.
- Multiply it by 0.208169 (the number of UK gallons in one US quart).
- Check the answer: it should be smaller than the number you started with.
Worked example: 25 qt × 0.208169 = 5.20421 imp gal.
To convert UK gallons back to US quarts, multiply by 4.8038, or divide by 0.208169.
Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).
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 |
qt to imp gal chart from 1 to 100
- 1 qt 0.208169 imp gal
- 2 qt 0.416337 imp gal
- 3 qt 0.624506 imp gal
- 4 qt 0.832674 imp gal
- 5 qt 1.04084 imp gal
- 6 qt 1.24901 imp gal
- 7 qt 1.45718 imp gal
- 8 qt 1.66535 imp gal
- 9 qt 1.87352 imp gal
- 10 qt 2.08169 imp gal
- 11 qt 2.28985 imp gal
- 12 qt 2.49802 imp gal
- 13 qt 2.70619 imp gal
- 14 qt 2.91436 imp gal
- 15 qt 3.12253 imp gal
- 16 qt 3.3307 imp gal
- 17 qt 3.53887 imp gal
- 18 qt 3.74703 imp gal
- 19 qt 3.9552 imp gal
- 20 qt 4.16337 imp gal
- 25 qt 5.20421 imp gal
- 30 qt 6.24506 imp gal
- 35 qt 7.2859 imp gal
- 40 qt 8.32674 imp gal
- 45 qt 9.36758 imp gal
- 50 qt 10.4084 imp gal
- 55 qt 11.4493 imp gal
- 60 qt 12.4901 imp gal
- 65 qt 13.531 imp gal
- 70 qt 14.5718 imp gal
- 75 qt 15.6126 imp gal
- 80 qt 16.6535 imp gal
- 85 qt 17.6943 imp gal
- 90 qt 18.7352 imp gal
- 95 qt 19.776 imp gal
- 100 qt 20.8169 imp gal
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 |
US Quarts vs UK Gallons
| US Quart | UK Gallon | |
|---|---|---|
| Symbol | qt | imp gal |
| Equals | 1 qt = 0.208169 imp gal | 1 imp gal = 4.8038 qt |
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.
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.
When You Need to Convert US Quarts to UK Gallons
US quarts are used mainly in the United States, while UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes. 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 qt compared with 1 imp gal?
1 qt is only 0.208169 of 1 imp gal: you need 4.8038 US quarts to make 1 imp gal, so the number gets smaller when you convert.
US Quarts to UK Gallons without a calculator
- In your head: multiply by 0.2 (about 3.9% off). 5 qt × 0.2 ≈ 1 imp gal.
- Closer estimate: multiply by 0.21 (within 0.88%).
- Or divide: divide by 4.8 (within 0.079%), which is often easier than multiplying by a small decimal.
Real-world qt to imp gal examples
| Example | US Quarts | UK Gallons |
|---|---|---|
| A quart of milk | 1 qt | 0.208169 imp gal |
| An engine oil change | 5 qt | 1.04084 imp gal |
| One imperial gallon | 4.8038 qt | 1 imp gal |
| A small aquarium | 48.038 qt | 10 imp gal |
| A garden water butt | 216.171 qt | 45 imp gal |
How exact is the qt to imp gal factor?
The factor is exact by definition, so any error comes only from rounding. For everyday use, 3 significant figures are plenty; for engineering or invoices, keep 5 or more.
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 US quarts and UK gallons
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
What people convert next
Next, you might want uk quarts to uk gallons, us quarts to us gallons, uk gallons to liters and uk gallons to us gallons. The full volume converter lists every unit.
On pakmath.com, the percentage calculator is a useful next step; Adzita offers a free gas mileage calculator.
Frequently asked questions
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 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 do I convert US quarts to UK gallons?
Multiply the number of US quarts by 0.208169. For example, 10 qt × 0.208169 = 2.08169 imp gal. To convert back, multiply by 4.8038.
What is 10 qt in UK gallons?
10 qt = 2.08169 imp gal.
What is 100 qt in UK gallons?
100 qt = 20.8169 imp gal.
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 US quarts to UK gallons?
In your head: multiply by 0.2 (about 3.9% off). 5 qt × 0.2 ≈ 1 imp gal.
How many UK gallons is 1 qt (a quart of milk)?
1 qt = 0.208169 imp gal.
How many US quarts is a small aquarium (10 imp gal)?
10 imp gal = 48.038 qt.
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