Quarts to Cubic Feet Calculator

This calculator converts a volume in quarts to its equivalent in cubic feet. You enter the number of quarts, and it returns the volume in cubic feet (and also in cubic inches for reference). The conversion uses the standard US liquid quart, where 1 quart equals exactly 0.0334201388888889 cubic feet (or 57.75 cubic inches).

Formula

The conversion is a simple multiplication:

Cubic feet = Quarts × 0.0334201388888889

Where:

• Quarts (qt) – the volume you start with, in US liquid quarts.
• Cubic feet (ft³) – the resulting volume, a measure of space in three dimensions (length × width × height, each in feet).

The factor 0.0334201388888889 is exact: it comes from 1 US quart = 57.75 cubic inches, and 1 cubic foot = 1,728 cubic inches (12³). So 57.75 ÷ 1,728 = 0.0334201388888889.

Worked Example

Suppose you have 8 quarts of soil (the default in the calculator). Convert to cubic feet:

1. Multiply quarts by the conversion factor: 8 × 0.0334201388888889 = 0.267361111111111.
2. Round to 4 decimal places: 0.2674 ft³.

So 8 quarts is about 0.2674 cubic feet. For practical purposes, that’s roughly a quarter of a cubic foot. If you also want cubic inches: 8 × 57.75 = 462 in³.

Why Use Quarts and Cubic Feet?

Quarts are a common unit for smaller liquid volumes in the US – milk, oil, paint, and many household products. Cubic feet are used for larger volumes, especially in shipping, construction, refrigeration, and gardening (e.g., bags of soil or mulch). You might need to convert between them when:

• Estimating how much potting soil to buy – bags are often labeled in quarts, but raised-bed plans are in cubic feet.
• Comparing container sizes – a cooler or storage bin might list capacity in cubic feet, while a jug is in quarts.
• Converting recipes or industrial formulas that use different units.

Because quarts are small and cubic feet are large, the conversion factor is less than 1 – a quart is a tiny fraction of a cubic foot.

How to Read the Result

The output in cubic feet is a decimal. For example, 0.2674 ft³ is less than one cubic foot. To visualize, a cubic foot is about the size of a basketball (roughly 12 × 12 × 12 inches). A quart is about a quarter of a gallon, or two pints. So 8 quarts is about 0.27 of that basketball-sized cube.

If you need a whole number of cubic feet, you can round up or down, but for precise measurements (like mixing concrete or soil), keep the decimal. The calculator also gives cubic inches, which can be easier to imagine for small volumes.

Common Mistakes and Misconceptions

The biggest error is mixing up US liquid quarts with other “quart� units:

• US liquid quart – used for most liquids in the US, equals 57.75 in³ (0.03342 ft³). This is what the calculator uses.
• US dry quart – used for dry goods like berries, equals 67.2 in³ (0.03889 ft³). That’s about 16% larger.
• Imperial quart – used in the UK, equals 69.35 in³ (0.04014 ft³).

Another common mistake is confusing quarts with gallons (1 gallon = 4 quarts) or forgetting that cubic feet is a volume, not an area – you need three dimensions. Also, when converting from quarts to cubic feet, make sure you’re not accidentally using the dry quart when the product is labeled “dry quart� (e.g., some soil bags).

Rounding too early can cause errors in large projects. For instance, if you need 100 cubic feet of soil, using 0.033 instead of 0.03342 would give you 99.9 ft³ instead of 100.26 ft³ – a small difference, but it adds up.

Practical Examples

Let’s apply the conversion to real scenarios:

• Potting soil: A bag of potting soil often holds 8 quarts. That’s 0.2674 ft³. If you’re filling a planter box that is 2 ft × 1 ft × 1 ft (2 ft³), you’d need about 8 bags (2 ÷ 0.2674 ≈ 7.5).
• Aquarium volume: A 20-gallon aquarium holds 80 quarts of water. That’s 80 × 0.03342 = 2.6736 ft³. The tank’s dimensions in feet multiplied together should give roughly that volume.
• Shipping: If a box is 1.5 ft × 1 ft × 1 ft = 1.5 ft³, that’s equivalent to 1.5 ÷ 0.03342 ≈ 44.9 quarts of liquid.

These examples show how the conversion works both ways – you can divide cubic feet by 0.03342 to get quarts.

Limits of the Formula

The formula is exact for US liquid quarts, but it assumes you are measuring liquid volume at standard conditions. For dry materials like soil, the actual volume can vary due to compaction, moisture, and particle size – a quart of dry soil might not fill exactly 57.75 cubic inches because of air gaps. Also, the conversion does not account for temperature expansion of liquids, which is negligible for most everyday uses.

If you are working with imperial or dry quarts, you must use a different factor. The calculator only handles US liquid quarts, so double-check the label on your product.

Alternatives and Related Conversions

If you need other volume conversions, you can use similar factors:

• Quarts to gallons: divide by 4.
• Quarts to liters: 1 US quart = 0.946353 liters.
• Cubic feet to cubic yards: divide by 27 (since 1 yard = 3 feet).
• Cubic feet to gallons: 1 cubic foot = 7.48052 US gallons.

For metric users, 1 cubic foot is about 28.3168 liters, and 1 quart is about 0.946 liters. So 1 cubic foot is roughly 29.9 quarts.

Frequently Asked Questions

How many quarts are in a cubic foot?

There are approximately 29.92 US liquid quarts in a cubic foot. That’s because 1 cubic foot = 1,728 cubic inches, and 1 quart = 57.75 cubic inches, so 1,728 ÷ 57.75 ≈ 29.92.

Is a quart the same as a liter?

No. A US liquid quart is about 0.946 liters, so a liter is slightly larger (about 1.057 quarts). The imperial quart is about 1.137 liters.

Can I use this calculator for dry quarts?

No, this calculator uses the US liquid quart. If you have dry quarts, multiply by 0.03889 instead of 0.03342. Always check the label – many soil and mulch bags use dry quarts.

Why is the conversion factor so small?

Because a quart is a small unit compared to a cubic foot. A cubic foot is a cube 12 inches on each side, which holds about 29.9 quarts. So each quart is only about 3.34% of a cubic foot.

How do I convert cubic feet back to quarts?

Multiply the cubic feet by 29.9220779 (the reciprocal of 0.0334201389). For example, 2 cubic feet × 29.9220779 ≈ 59.84 quarts.

Does the calculator work for imperial quarts?

No. The imperial quart is larger (69.35 in³). To convert imperial quarts to cubic feet, multiply by 0.04014. This calculator only handles US liquid quarts.

Related

• 12 ml to ounces Calculator: Quick, Accurate Conversions
• 11mm to Inches Fraction Calculator
• 10mm to Inches Fraction Calculator

in q | Quarts (US liquid) | qt | 8 | 0
out ft3 | Cubic feet | ft³ | q * 0.0334201388888889 | 4
out in3 | Cubic inches | in³ | q * 57.75 | 2