Cubic Feet Calculator

What Is a Cubic Foot?

A cubic foot is a unit of volume equal to the space occupied by a cube with sides of exactly one foot (12 inches) in length, width, and height. It is part of the US customary and imperial measurement systems and is widely used in the United States for measuring storage space, appliance capacity, concrete volume, freight, and shipping. One cubic foot equals 1,728 cubic inches, approximately 7.48 US gallons, or 28.317 liters.

Volume measurements in cubic feet are essential for practical applications ranging from ordering the right amount of concrete for a driveway to estimating how many boxes fit in a moving truck. The cubic foot bridges everyday measurements and large-scale projects by providing a consistent unit that contractors, homeowners, and logistics professionals all recognize.

How the Cubic Feet Calculator Works

Calculating Volume from Dimensions

Enter your length, width, and height into the calculator on the left and select the unit your measurements are in. The calculator automatically converts all three dimensions to feet before multiplying them together. This means you can enter measurements in inches, yards, meters, or centimeters without doing any manual unit conversion.

Converting Between Volume Units

Once the cubic footage is calculated, the tool simultaneously converts the result to cubic yards, cubic meters, cubic inches, US gallons, liters, and cubic centimeters. These conversions are applied using fixed mathematical ratios and displayed as a results table inside the chat panel.

Understanding the Results

The result shows both the raw cubic feet figure and a full conversion table. This is useful when you need to order materials (often sold in cubic yards), fill containers (measured in gallons or liters), or communicate volume to international partners who use the metric system. After the instant result appears, you can continue chatting with the AI to ask about material quantities, costs, or application-specific advice.

Cubic Feet Formula

The formula for calculating cubic feet is straightforward when all measurements are already in feet:

When measurements are in a different unit, convert each dimension to feet first, then apply the formula. For a full reference of unit conversion factors across length, weight, and volume, see the unit conversion chart. Common conversion factors to feet:

• Inches to feet: divide by 12
• Yards to feet: multiply by 3
• Meters to feet: multiply by 3.28084
• Centimeters to feet: multiply by 0.0328084

Cubic Feet Conversion Table

How to Calculate Cubic Yards from Cubic Feet

Cubic yards are commonly used for ordering bulk materials such as concrete, soil, gravel, and mulch. Since there are 3 feet in a yard, and volume is a three-dimensional measure, there are 3 × 3 × 3 = 27 cubic feet in one cubic yard.

For example, a concrete pour measuring 10 × 10 × 0.5 feet equals 50 cubic feet, which is 50 ÷ 27 = 1.85 cubic yards. Most concrete suppliers sell by the cubic yard, so this conversion is critical for accurate ordering and cost estimation. Use our gravel calculator or asphalt calculator to go further with material planning.

Cubic Feet to Gallons

One cubic foot holds exactly 7.48052 US gallons of liquid. This conversion is useful for sizing aquariums, swimming pools, storage tanks, and irrigation systems. To convert cubic feet to gallons, multiply the cubic feet value by 7.48052. To go the other way, divide gallons by 7.48052.

Common uses include: a 55-gallon drum is approximately 7.35 cubic feet; a standard bathtub holds about 40–60 gallons (5.3–8.0 ft³); a 10,000-gallon swimming pool is approximately 1,337 cubic feet.

Practical Uses for Cubic Feet Calculations

Moving and Storage

Moving trucks and storage units are measured in cubic feet. A standard 10×10×8-foot storage unit holds 800 cubic feet. Moving truck sizes typically range from 150 cubic feet (cargo van) to over 1,700 cubic feet (26-foot truck). Knowing the cubic footage of your belongings helps you choose the right truck size and avoid costly oversizing or last-minute trips.

Concrete and Landscaping Materials

Contractors use cubic feet—and the corresponding cubic yards—to calculate how much concrete, gravel, topsoil, mulch, or sand to order. Overordering wastes money; underordering delays projects. For a garden bed 4 feet wide, 8 feet long, and 1 foot deep, you need 32 cubic feet or about 1.19 cubic yards of soil. Use the calculator to plan material purchases accurately. For large paving or landscaping projects, also check our gravel calculator.

Refrigerator and Appliance Capacity

Refrigerators, freezers, dishwashers, and ovens list their capacity in cubic feet. A standard full-size refrigerator is 18–26 cubic feet. A compact mini fridge is 1.7–4.5 cubic feet. When shopping for appliances, knowing the cubic footage relative to your available space helps avoid buying a unit that is too large or too small for your kitchen layout.

Shipping and Freight

Freight carriers often charge by cubic feet or dimensional weight when shipments are large but light. Calculating the cubic footage of a pallet or crate helps you estimate shipping costs and compare carriers accurately. Standard shipping pallets (48×40×48 inches loaded) hold approximately 53.3 cubic feet. Use this calculator to quickly assess dimensional weight pricing.

Cubic Feet Calculator Examples

Example 1 — Storage Unit 10×10×8 Feet

A standard 10×10×8-foot storage unit: V = 10 × 10 × 8 = 800 cubic feet. In cubic yards: 800 ÷ 27 = 29.6 yd³. In gallons: 800 × 7.48 = 5,984 gallons. This is the most common self-storage size and can hold the contents of a 2–3 bedroom apartment.

Example 2 — Garden Bed Soil in Cubic Yards

A raised garden bed measuring 4 feet wide, 8 feet long, and 12 inches (1 foot) deep: V = 4 × 8 × 1 = 32 cubic feet. Converting to cubic yards: 32 ÷ 27 = 1.19 yd³. When ordering topsoil, round up to 1.25 cubic yards to account for settling. Topsoil typically costs $15–$50 per cubic yard, so this bed would cost $20–$65 in soil.

Example 3 — Fish Tank in Gallons

A fish tank measuring 48 inches long × 13 inches wide × 21 inches tall: Convert to feet first — 4 × 1.083 × 1.75 = 7.58 cubic feet. In gallons: 7.58 × 7.48 = 56.7 gallons. This is close to a standard 55-gallon aquarium. Knowing the exact volume helps determine the correct filter size, heater capacity, and chemical dosing for water treatment.

Frequently Asked Questions