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Cubic Feet Calculator

Calculate cubic feet, cubic yards, cubic inches, quantity totals, and optional cost from rectangular dimensions.

  • cubic foot
  • cubic footage
  • volume calculator
  • box volume
  • shipping cube

Enter the rectangular length.

Enter the rectangular width.

Enter the height, depth, or thickness.

Choose the unit used for all three dimensions.

Optional number of identical boxes, spaces, or items.

Optional extra percentage for compaction, packing gaps, spills, or ordering margin.

Optional bag or container size in cubic feet for bag-count estimates.

Optional material density in pounds per cubic foot for rough weight estimates.

Optional price for a rough cost estimate.

Status: initial

Results

Awaiting calculation

Explore your result

Volume across ordering units

Explore the cubic feet calculator result visually while keeping this page's detailed guidance and examples.

Volume across ordering units
Cubic feet54 ft³
Cubic yards2 yd³
With waste59.4 ft³

Use this result well

  1. 1Verify the calculator inputs.
  2. 2Compare the key result relationships.
  3. 3Review the page guidance before acting.

Read every unit label before comparing converted volume values.

Calculator guide

Introduction

The Cubic Feet Calculator finds the volume of a rectangular box, room, shipment, container, or material area from length, width, and height.

What is a cubic foot?

A cubic foot is a unit of volume equal to a cube that is 1 foot long, 1 foot wide, and 1 foot high. Cubic feet are commonly used for rooms, boxes, containers, appliances, shipping, mulch, soil, gravel, and storage capacity.

Cubic feet formula

For a rectangular shape, cubic feet equals length in feet multiplied by width in feet multiplied by height in feet. If dimensions are entered in another unit, the calculator converts them to feet first.

Variable explanations

Understand what each input and result means before calculating.

Length

The longest side or front-to-back measurement.

Width

The side-to-side measurement.

Height or depth

The vertical, depth, or thickness measurement.

Unit

The measurement unit used for the entered dimensions.

Quantity

The number of identical boxes, spaces, or items.

Waste or overage

Optional percentage added for compaction, gaps, or margin.

Bag size

Optional bag or container volume in cubic feet for whole-bag estimates.

Density

Optional pounds per cubic foot used for rough weight and ton estimates.

Reviewed by the Calculator.org.in Editorial Team

Formula behavior, validation cases, explanatory examples, and cited sources are checked before publication. This review supports educational accuracy and is not a substitute for qualified professional advice.

Last reviewed: 2026-08-02

Review process

Formula guide

See the calculation logic, variable definitions, and practical meaning.

Cubic feet

Cubic Feet = Length(ft) x Width(ft) x Height(ft)

  • Length, width, and height must use feet before multiplying.

This is the standard rectangular volume formula.

Cubic yards

Cubic Yards = Cubic Feet / 27

  • One cubic yard equals 27 cubic feet.

This is useful for bulk materials such as soil, mulch, gravel, or concrete.

Cubic inches

Cubic Inches = Cubic Feet x 1,728

  • One cubic foot equals 1,728 cubic inches.

This helps compare measurements entered or reported in inches.

Liters and gallons

Liters = ft^3 x 28.3168; US gallons = ft^3 x 7.4805

  • These conversions are useful for containers and liquid capacity.

Volume can be converted into common liquid-capacity units.

Waste-adjusted volume

Adjusted Volume = cubic feet x (1 + waste %)

  • Waste accounts for compaction, gaps, or ordering margin.

This helps with real-world material estimating.

Estimated weight

Weight = adjusted cubic feet x density

  • Density is entered in pounds per cubic foot.

This is a rough estimate because material density changes with moisture and compaction.

Worked examples

Follow realistic inputs through the calculation step by step.

1

Worked example

Room volume

  1. 1Length is 10 ft.
  2. 2Width is 8 ft.
  3. 3Height is 9 ft.
  4. 4Volume is 720 cubic feet.
2

Worked example

Box in inches

  1. 1Enter 30 x 36 x 25 inches.
  2. 2Each dimension is converted to feet.
  3. 3Volume is 15.63 cubic feet.
3

Worked example

Material depth

  1. 1Enter length and width.
  2. 2Use height as depth or thickness.
  3. 3Convert total cubic feet to cubic yards.
4

Worked example

Bagged mulch or soil

  1. 1Enter area dimensions and depth.
  2. 2Add a waste or compaction allowance.
  3. 3Enter bag size in cubic feet.
  4. 4Review bags or containers needed.
5

Worked example

Container capacity

  1. 1Use inside dimensions for length, width, and height.
  2. 2Review cubic feet, liters, and US gallons.
  3. 3Use the conversion table to compare storage or liquid capacity.

Common mistakes

Avoid these common input and interpretation errors.

Mixing units

Use the selected unit consistently for all dimensions in this version.

Using exterior dimensions

For capacity, measure the inside dimensions of the container or space.

Ignoring waste

Materials may need extra allowance for compaction, cutting, or uneven surfaces.

Using cubic feet for irregular shapes

Irregular shapes may need a different formula or a specialized calculator.

Forgetting supplier units

Bulk material may be sold by cubic yard, bag, ton, or truckload rather than cubic foot.

Treating density as fixed

Material weight changes with moisture, compaction, and material mix.

Frequently asked questions

Quick answers to the questions users ask most often.

What does this Cubic Feet Calculator calculate?
It calculates rectangular volume in cubic feet, cubic yards, cubic inches, and optional estimated cost.
How do you calculate cubic feet?
Convert length, width, and height to feet, then multiply them together.
What is the cubic feet formula?
Cubic feet equals length in feet times width in feet times height in feet.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard.
How many cubic inches are in a cubic foot?
There are 1,728 cubic inches in one cubic foot.
Can I enter inches?
Yes. Choose inches as the unit and enter all dimensions in inches.
Can I enter meters or centimeters?
Yes. The calculator converts meters or centimeters to feet before calculating volume.
Can I calculate multiple boxes?
Yes. Enter the quantity of identical boxes or items.
Does this calculate weight?
No. Weight requires density and material-specific assumptions.
Does this calculate cylinder volume?
No. This first version is for rectangular shapes only.
Can I use this for mulch or soil?
Yes for rectangular areas, but add an allowance for compaction and supplier rounding.
Can I use this for shipping?
Yes for rectangular packages, but carriers may use their own dimensional weight rules.
Should I measure inside or outside dimensions?
Use inside dimensions for capacity and outside dimensions for physical package size.
Why does the calculator show cubic yards?
Bulk materials are often sold by cubic yard, so cubic yard conversion is useful.
Is this an exact material order?
No. It is a geometric estimate and should be checked against real-world material and supplier rules.
How many gallons are in a cubic foot?
One cubic foot is about 7.48 US gallons.
How many liters are in a cubic foot?
One cubic foot is about 28.32 liters.
Can this estimate bags of mulch or soil?
Yes. Enter the bag size in cubic feet and the calculator rounds up to whole bags.
Can this estimate weight?
Yes. Enter material density in pounds per cubic foot to estimate pounds and tons.

References

Sources used to support the calculator guidance.

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Version history

A transparent record of calculator content updates.

Updated 2026-08-02
  • 1.0.0 · 2026-07-05

    Initial cubic feet calculator release.

  • 1.1.0 · 2026-08-02

    Added waste-adjusted volume, bag estimates, density-based weight estimates, gallons, liters, cubic meters, conversion table, and planning checklist.