US Quarts to Imperial Quarts Calculator
US and Imperial quarts are not the same size. One US quart (946.353 mL) equals 0.832674 Imperial quarts (each 1,136.52 mL). This calculator converts any US quart value to Imperial quarts — essential for adapting American recipes for UK kitchens, understanding British cookbooks, and international trade between the US and Commonwealth countries.
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US Quarts to Imperial Quarts Calculator
1 qt × 0.8327 = 0.8327 imp qt
- Factor
- 1 qt = 0.8327 imp qt
- Reverse
- 1 imp qt = 1.20095 qt
Imperial quarts and Quarts
Everything you need to know about converting quarts to Imperial quarts.
US vs Imperial Quarts: The Key Differences
The US quart and Imperial quart share a name but differ in size by about 20%. A US quart holds 946.353 mL (32 US fl oz), while an Imperial quart holds 1,136.52 mL (40 Imperial fl oz). The difference traces back to 1824 when Britain redefined its measurement system.
Before 1824, both countries used the same 'wine gallon' of 231 cubic inches. Britain's Weights and Measures Act of 1824 replaced it with the Imperial gallon (defined as 10 pounds of water at 62°F), creating the split. The US kept the original wine gallon, which is why US quarts are smaller.
When This Conversion Matters
Recipe adaptation is the most common use case. A British recipe calling for '2 quarts of stock' means 2 Imperial quarts (2,273 mL) — if you measure 2 US quarts (1,893 mL), you'll be short by 380 mL (about 1.6 US cups). The 20% difference can significantly affect soups, stews, and baked goods.
International trade between the US and UK, Canada, Australia, or other Commonwealth countries also requires this conversion. Fuel, beverages, chemicals, and other liquids may be quoted in either US or Imperial quarts depending on the market.
Quarts to Imperial quarts Formula
A US quart = 946.353 mL. An Imperial quart = 1,136.52 mL. Dividing: 946.353 ÷ 1,136.52 = 0.832674. So 1 US quart is about 83.27% of an Imperial quart — the Imperial quart is roughly 20% larger.
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Quarts → Imperial quarts
A US quart = 946.353 mL. An Imperial quart = 1,136.52 mL. Dividing: 946.353 ÷ 1,136.52 = 0.832674. So 1 US quart is about 83.27% of an Imperial quart — the Imperial quart is roughly 20% larger.
Imperial quarts → Quarts
To convert Imperial quarts back to US quarts, multiply by 1.20095. For example, 5 Imperial quarts × 1.20095 = 6.005 US quarts. Each Imperial quart is about 1.2 US quarts.
Quarts to Imperial quarts Conversion Table
Quick reference for converting quarts to Imperial quarts
| Quarts | Imperial quarts |
|---|---|
| 1 qt | 0.8327 imp qt |
| 2 qt | 1.6653 imp qt |
| 3 qt | 2.498 imp qt |
| 4 qt | 3.3307 imp qt |
| 5 qt | 4.1634 imp qt |
| 6 qt | 4.996 imp qt |
| 7 qt | 5.8287 imp qt |
| 8 qt | 6.6614 imp qt |
| 9 qt | 7.4941 imp qt |
| 10 qt | 8.3267 imp qt |
Frequently Asked Questions
Is a US quart the same as an Imperial quart?
No. A US quart (946.353 mL) is about 20% smaller than an Imperial quart (1,136.52 mL). 1 US quart = 0.8327 Imperial quarts. The difference dates back to Britain's 1824 Weights and Measures Act.
How many US quarts are in 1 Imperial quart?
1 Imperial quart equals 1.20095 US quarts. The Imperial quart is the larger unit — about 190 mL (6.4 US fl oz) more than a US quart.
Why are US and Imperial quarts different?
Before 1824, both countries used the same wine gallon. Britain redefined its gallon as the volume of 10 pounds of water at 62°F (4,546.09 mL). The US kept the original wine gallon (3,785.41 mL). This created the 20% size difference in all derived units including quarts and pints.
How do I convert an Imperial quart recipe to US quarts?
Multiply Imperial quarts by 1.20095 to get US quarts. For example, a recipe calling for 3 Imperial quarts needs 3 × 1.20095 = 3.603 US quarts, or about 3 quarts and 2.4 cups.
Which countries use Imperial quarts?
The UK, Canada (partially), and some Caribbean nations still use Imperial measurements in everyday life. Australia, New Zealand, and most other former British colonies have fully metricated. The US uses its own customary system, which is different from Imperial.
How many US gallons in an Imperial gallon?
1 Imperial gallon = 1.20095 US gallons. Since 1 gallon = 4 quarts: 4 × 1.20095 = 4.804 US quarts per Imperial gallon.
How do I convert US quarts to Imperial quarts?
Multiply US quarts by 0.832674. For example, 10 US quarts × 0.832674 = 8.327 Imperial quarts. You can also divide by 1.20095 for the same result.
Convert Quarts to Imperial quarts Instantly
Use this free quarts to Imperial quarts calculator for cooking, baking, science, and everyday conversions. Enter any quart value and get the Imperial quarts equivalent instantly.
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