Calculate quarts from box or cylinder dimensions, or convert known volumes to US liquid, imperial, or dry quarts, liters, and gallons for any container.
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Quart Volume Formula
The calculator uses three formulas depending on the mode you pick. Each one ends by dividing cubic inches by the cubic inches in your chosen quart type.
Box mode:
Cylinder mode:
Convert mode:
- L, W, H = length, width, height in inches
- D = diameter in inches
- V = input volume in your selected unit
- F = cubic inches per unit of V
- Q = cubic inches per quart (57.75 US liquid, 67.200625 US dry, 69.3548583234 imperial)
Rectangular-container mode multiplies three side lengths after converting each to inches. Cylindrical-container mode squares the radius and multiplies by height. Known-volume mode takes a known volume in any common unit and restates it as quarts. In every mode, the quart-type dropdown sets the divisor Q.
Reference Tables
Use these to sanity-check the calculator output and to pick the correct quart type.
| Quart type | Cubic inches | Liters | Used for |
|---|---|---|---|
| US liquid | 57.75 | 0.9464 | Cooking, beverages, fuel in US |
| US dry | 67.2006 | 1.1012 | Berries, grain, produce in US |
| Imperial | 69.3549 | 1.1365 | UK, Canada (legacy) |
| Container size | US liquid quarts |
|---|---|
| 1 cup | 0.25 |
| 1 pint | 0.5 |
| 1 liter | 1.0567 |
| 1 US gallon | 4 |
| 1 cubic foot | 29.922 |
| 5-gallon bucket | 20 |
Example Problems
Example 1: Rectangular planter. A planter is 25 in long, 10 in wide, and 12 in deep. Volume in cubic inches is 25 × 10 × 12 = 3,000. In US liquid quarts that is 3,000 / 57.75 = 51.95 qt.
Example 2: Cylindrical tank. A tank has an 8 in diameter and a 20 in height. Radius is 4 in, so volume is π × 16 × 20 = 1,005.31 in³. In US liquid quarts that is 1,005.31 / 57.75 = 17.41 qt.
FAQ
US liquid or US dry quart, which should you use? Use the liquid quart for any fluid, including water, oil, milk, and fuel. Use the dry quart only for loose dry goods sold by US dry measure, such as berries or grain.
Why is the imperial quart larger? The imperial system defines a gallon as about 4.546 liters, while a US gallon is about 3.785 liters. Each system divides its gallon into four quarts, so the imperial quart is roughly 20% larger than the US liquid quart.
Does the calculator account for wall thickness? No. Use measured inside dimensions for capacity. If starting from outside dimensions, subtract both opposing wall thicknesses from length, width or diameter. For height or cylinder length, subtract the applicable base, lid or end-wall thicknesses. Allow separately for headspace, rounded corners and internal fittings.
How do you convert quarts back to gallons? Divide US liquid quarts by 4 for US liquid gallons, or Imperial quarts by 4 for Imperial gallons. US dry quarts use a different definition and cannot be divided by 4 to obtain US liquid gallons. The result panel labels US liquid gallons explicitly.
