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Volume Calculator

Calculate box volume from length, width, and height inputs.

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 price for a rough cost estimate.

Status: initial

Results

Awaiting calculation

Calculator guide

Introduction

The Volume Calculator estimates rectangular-prism volume from length, width, and height.

Purpose

Use this calculator for storage, shipping, construction, and material estimates where a simple box volume is appropriate.

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

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.

Formula guide

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.

Worked examples

Room volume

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

Box in inches

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

Material depth

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

Common mistakes

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.

FAQs

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.

References

Related calculators

Last updated and version history

Last updated: 2026-07-10

  • 1.0.0 (2026-07-10): Initial volume calculator page using the verified cubic feet engine.