Quarts to Cubic Feet? Quick Converter & Formula

Updated 13 November 2026 · Standard formula, shown below

Cubic Feet 0.03 ft³

Quarts: 1 qt; You entered

This calculator converts a volume in quarts to cubic feet. You enter the number of quarts, and it returns the equivalent volume in cubic feet, using the standard US conversion factor. The result is displayed with two decimal places, and the formula and a worked example are provided below.

Formula

The conversion uses a fixed relationship between the US quart and the cubic foot:

1 US quart = 0.0334201389 cubic feet

Therefore, the formula is:

cubic feet = quarts × 0.0334201389

Or, equivalently:

cubic feet = quarts ÷ 29.9220779

In the calculator above, the expression q / 29.9220779 implements the second form. The number 29.9220779 is the exact number of US quarts in one cubic foot (since 1 ft³ = 7.48051948 US gallons and 1 gallon = 4 quarts, so 1 ft³ = 7.48051948 × 4 = 29.9220779 quarts).

Worked Example

Using the default value of 1 quart:

Start with the formula: cubic feet = quarts ÷ 29.9220779
Plug in 1 quart: cubic feet = 1 ÷ 29.9220779
Calculate: 1 ÷ 29.9220779 = 0.0334201389
Round to two decimals: 0.03 ft³

The calculator shows 0.03 ft³ for 1 quart, matching the manual calculation.

US Quart vs. Imperial Quart

There are two different “quart” units in the world, and confusing them leads to errors.

US quart (qt): Used in the United States for cooking and commerce. 1 US quart = 0.946352946 liters. This is the unit used in this calculator.
Imperial quart (UK): Used in the United Kingdom and some Commonwealth countries. 1 Imperial quart = 1.1365225 liters, which is about 20% larger than the US quart.

If you are converting an Imperial quart to cubic feet, the factor is different: 1 Imperial quart = 0.0401359 cubic feet (since 1 Imperial gallon = 0.1605436 ft³ and 1 Imperial gallon = 4 Imperial quarts). Always check which quart your source uses.

When to Use This Conversion

You might need this conversion in several real-world situations:

Estimating how much soil, mulch, or compost to buy for a garden bed (often sold in quarts, but you need cubic feet for volume calculations).
Converting a recipe’s liquid measurements when working with a container that measures in cubic feet (e.g., a large mixing tank).
Understanding the volume of a cooler, aquarium, or storage bin that is labeled in quarts but you want to compare with cubic feet dimensions.
Performing a science experiment or engineering calculation where the unit system requires cubic feet.

For example, a 32-quart cooler holds exactly 1.07 cubic feet (32 ÷ 29.9220779 ≈ 1.07). That tells you the cooler’s interior volume is roughly equivalent to a cube about 1 foot on each side.

Common Mistakes and Misconceptions

Here are the most frequent errors people make when converting quarts to cubic feet:

Using the wrong quart: As noted, US and Imperial quarts are not the same. If you use the Imperial quart, your result will be off by about 20%.
Mixing up gallons and quarts: A gallon is 4 quarts, but a cubic foot is 7.48 US gallons. Some people mistakenly divide by 4 or multiply by 4, which gives a wildly wrong answer.
Forgetting to round correctly: The calculator rounds to two decimals, but if you need a precise volume, keep more digits. For example, 1 quart is exactly 0.0334201389 ft³, not 0.03 ft³.
Assuming the conversion is linear in the wrong way: The conversion is linear, but the factor is not a nice round number. Always use the exact factor (29.9220779) rather than a rounded approximation like 30, unless you only need a rough estimate.

Limits of the Formula

The formula works for any volume, but it assumes you are measuring a liquid-like substance that fills the container completely. For granular materials like soil or gravel, the actual volume depends on compaction and particle size, so the conversion still gives the nominal volume but not the exact space occupied. Also, the conversion factor is exact for US quarts, but if you are using a different definition (e.g., dry quart), the factor changes.

The US dry quart is a different unit used for dry goods like berries or grains. 1 US dry quart = 1.1012209 liters, and 1 US dry quart = 0.0388893 ft³. This calculator uses the liquid quart, which is the most common in everyday use.

Frequently Asked Questions

How many quarts are in a cubic foot?

There are exactly 29.9220779 US liquid quarts in one cubic foot. This is derived from the fact that 1 cubic foot equals 7.48051948 US gallons, and each gallon has 4 quarts. So 7.48051948 × 4 = 29.9220779.

Is 1 quart equal to 1 liter?

No. 1 US quart is approximately 0.946 liters, which is slightly less than a liter. 1 Imperial quart is approximately 1.137 liters, which is more than a liter. The difference is about 5% for the US quart and 14% for the Imperial quart.

How do I convert cubic feet back to quarts?

Multiply the number of cubic feet by 29.9220779 to get US quarts. For example, 2 cubic feet × 29.9220779 = 59.84 quarts. This is the inverse of the formula used in this calculator.

Why is the conversion factor so odd (29.9220779)?

Because the units are defined independently. The cubic foot is based on the foot (12 inches), while the quart is based on the gallon, which was historically defined as the volume of a cylinder 6 inches in diameter and 6 inches high (231 cubic inches). That gives 1 gallon = 231 in³, and 1 cubic foot = 1728 in³, so 1 cubic foot = 1728/231 = 7.48051948 gallons. Multiply by 4 to get quarts, and you get the non-integer factor.

Can I use this calculator for dry quarts?

No, this calculator uses the US liquid quart. For dry quarts, use a different factor: 1 US dry quart = 0.0388893 ft³. If you enter a dry quart amount, the result will be about 14% too low.

What about Imperial quarts?

This calculator does not handle Imperial quarts. To convert Imperial quarts to cubic feet, multiply by 0.0401359. For example, 10 Imperial quarts = 10 × 0.0401359 = 0.4014 ft³. Always verify which quart system your measurement uses.

Formula used

in q | Quarts | qt | 1 | 0
out ft3 | Cubic Feet | ft³ | q / 29.9220779 | 2

Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.