Cubic Feet Calculator · Volume & Unit Converter

Cubic Feet Calculator

Calculate cubic feet from dimensions and convert to any volume unit

Setup

Shape

Dimension units

Choose the shape and the unit your dimensions are in — the calculator converts everything to cubic feet and many other volume units.

Dimensions

Length

Width

Height

Box volume = Length × Width × Height

Quick examples

Volume Result

📦 Small volume

Volume

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Cubic feet — Other units —

Cubic feet

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Cubic inches

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Cubic yards

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Cubic meters

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Liters

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Gallons (US)

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Gallons (Imperial)

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Acre-feet

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Full breakdown — the volume in every unit

Unit	Value	Unit	Value

Your volume in common containers

Container	Volume (ft³)	How many fit	Percentage

All conversions use exact definitions: 1 ft³ = 1728 in³ = 0.037037 yd³ = 0.0283168 m³ = 28.3168 L = 7.48052 US gal.

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Creator & Maintainer

Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.

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A box marked 4 by 3 by 2 feet holds 24 cubic feet. That number decides how much soil fills a raised bed, how many cartons fit on a pallet, or whether a new fridge clears the doorway. This calculator handles seven shapes: rectangular box, cylinder, sphere, cone, capsule, rectangular pyramid, and tube. Each shape has its own formula, and every dimension converts to feet before the math runs. The result appears in cubic feet plus a full table of other units. It’s built for shipping, landscaping, construction, and anyone who needs volume fast.

How to Use the Cubic Feet Calculator

Pick a shape from the dropdown. Box, cylinder, sphere, cone, capsule, pyramid, or tube.
Choose the dimension unit. Feet, inches, yards, meters, centimeters, or millimeters.
Enter the dimensions the tool asks for. Boxes use length, width, and height. Cylinders use diameter and height.
Read the total volume in cubic feet in the hero panel.
Check the breakdown table for the same volume in liters, gallons, cubic meters, and more.
Scroll to the container table to see how many bathtubs or shipping containers your volume fills.

How the Cubic Feet Calculator Formula Works

Each shape has its own volume formula. Every dimension converts to feet first.

Formula: Box volume = Length × Width × Height
Formula: Pyramid volume = (1/3) × Length × Width × Height
Formula: Cylinder volume = π × (Diameter ÷ 2)² × Height
Formula: Cone volume = (1/3) × π × (Diameter ÷ 2)² × Height
Formula: Sphere volume = (4/3) × π × (Diameter ÷ 2)³
Formula: Capsule volume = π r² L + (4/3) π r³
Formula: Tube volume = π × (Diameter ÷ 2)² × Length

Dimension units convert to feet using exact factors. One inch is 1/12 foot. One yard is 3 feet. One meter is 3.280839895 feet. One centimeter is 1/30.48 foot. One millimeter is 1/304.8 foot. The tool applies the right factor to every dimension before calculating.

Volume units convert from cubic feet using exact definitions. One cubic foot equals 1,728 cubic inches, 1/27 cubic yard, 0.028316846592 cubic meters, 28.316846592 liters, and 7.48051948052 US gallons.

Validation blocks negative dimensions and zero volume. If any dimension is missing or negative, the result shows an error.

Worked Example

A shipping department packs cartons measuring 18 inches long, 14 inches wide, and 12 inches tall.

Convert inches to feet:
Length: 18 ÷ 12 = 1.5 ft
Width: 14 ÷ 12 = 1.1667 ft
Height: 12 ÷ 12 = 1.0 ft

Volume: 1.5 × 1.1667 × 1.0 = 1.75 ft³

Now convert to other units:
Cubic inches: 1.75 × 1,728 = 3,024 in³
Cubic yards: 1.75 ÷ 27 = 0.0648 yd³
Cubic meters: 1.75 × 0.028316846592 = 0.0496 m³
Liters: 1.75 × 28.316846592 = 49.55 L
US gallons: 1.75 × 7.48051948052 = 13.09 gal

The badge reads “Small volume” because 1.75 cubic feet falls under 10. The container table shows the carton fills about 0.15 of a standard bathtub, or 0.4% of a 20-foot shipping container.

Frequently Asked Questions

What is a cubic foot?

A cubic foot is the volume of a cube one foot long, one foot wide, and one foot tall. It equals 1,728 cubic inches, 7.48 US gallons, or 28.32 liters. Shipping, landscaping, and appliance sizing all use cubic feet.

How do you calculate cubic feet?

Multiply length by width by height, with all dimensions in feet. A 4 ft × 3 ft × 2 ft box holds 24 cubic feet. If your measurements are in inches, divide each by 12 before multiplying.

How many cubic feet are in a cubic yard?

Twenty-seven. A cubic yard is 3 ft × 3 ft × 3 ft, which equals 27 cubic feet. Concrete and mulch often sell by the cubic yard, so divide your cubic feet by 27 to order.

How many gallons are in a cubic foot?

One cubic foot equals 7.48051948052 US gallons. A 10-cubic-foot tank holds about 74.8 gallons. The calculator shows gallons alongside liters, cubic meters, and other units.

How do you calculate cylinder volume in cubic feet?

Square the radius, multiply by pi, then multiply by height. A cylinder 2 ft across and 4 ft tall has a radius of 1 ft. Volume = π × 1² × 4 = 12.57 cubic feet.

How do you convert inches to cubic feet?

Divide each dimension by 12 to get feet, then multiply length × width × height. A 24 in × 18 in × 12 in box becomes 2 ft × 1.5 ft × 1 ft = 3 cubic feet. Don’t divide the final volume by 12.

What is the volume of a sphere in cubic feet?

Use (4/3) × π × radius³. A sphere 2 ft in diameter has a 1 ft radius. Volume = 1.3333 × 3.14159 × 1 = 4.19 cubic feet. The calculator handles the cube of the radius.

Why is a cone’s volume one-third of a cylinder’s?

A cone with the same base and height as a cylinder holds exactly one-third the volume. That’s a geometric property, not a conversion. A 2 ft diameter, 4 ft tall cone holds 4.19 cubic feet, while the matching cylinder holds 12.57.

How do I calculate weight from cubic feet?

Multiply volume in cubic feet by material density in pounds per cubic foot. Water is 62.43 lb/ft³, concrete is 150 lb/ft³, dry sand is 100 lb/ft³, and mulch is 20 to 30 lb/ft³. The calculator accepts either lb/ft³ or kg/m³.

Can I use this calculator for shipping?

Yes. Enter carton dimensions, set the quantity, and read the total cubic feet. Shipping carriers often bill by cubic feet or dimensional weight. The container table shows how much of a standard shipping container your load fills.

Disclaimer

This calculator provides volume estimates based on the dimensions you enter. Real-world volume can differ if measurements are rounded, if the container is not a perfect shape, or if material settles or compacts. Density values vary by moisture content and supplier. Use the results as a planning guide, not as a guaranteed order quantity. For structural, engineering, or shipping decisions, verify with a professional or the carrier’s own calculator.

Cubic Feet Calculator

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