Cubic Feet Calculator (cu ft / ft³)
Calculate 3D volume in cubic feet from length, width, and height with multi-unit support.
Privacy First: 100% Client-Side Processing
Processed in your browser. Files are never uploaded.
How to Use the Cubic Feet Calculator
- 1Select your shape: Rectangular Prism (Box), Cylinder, or Sphere.
- 2Enter the dimensions (Length, Width, Height) and choose their respective units.
- 3The tool calculates the volume in cubic feet, cubic inches, and cubic meters.
- 4Copy your volume results or convert directly to cubic yards.
Formula & How It Works
Rectangular Prism Volume Formula
Volume of a rectangular space is length multiplied by width multiplied by height. When dimensions are entered in inches, divide the resulting cubic inches by 1,728.
Worked Examples
Raised Garden Bed
Input: 8 ft long × 4 ft wide × 1.5 ft deep
Explanation: 8 × 4 × 1.5 = 48 cubic feet.
Shipping Container in Inches
Input: 36 in × 24 in × 24 in
Explanation: (36 × 24 × 24) / 1,728 = 12 cu ft.
Frequently Asked Questions
How many cubic inches are in one cubic foot?▼
There are 1,728 cubic inches in one cubic foot (12 × 12 × 12).
How do I convert cubic feet to cubic yards?▼
Divide cubic feet by 27, because 1 cubic yard equals 27 cubic feet (3 × 3 × 3).
How many bags of soil (2 cu ft) do I need?▼
Divide your total required cubic feet by 2 to determine the number of 2-cubic-foot bags.
Can I enter decimal dimensions?▼
Yes, decimal values (e.g. 2.5 feet) are fully supported.
Related Online Tools
Explore complementary calculators and converters with instant client-side execution
Cubic Yard Calculator
Calculate cubic yards for concrete pours, topsoil, mulch, and site excavation.
Square Footage Calculator
Calculate square footage for rectangular, circular, or triangular spaces with waste percentage and material cost.
Gravel Calculator
Estimate gravel volume in cubic yards and weight in tons for driveways, landscaping, and foundation pads.
Board Foot Calculator
Calculate board feet (FBM) for hardwood and dimensional lumber with cost estimates.
Stair Calculator
Calculate number of risers, tread depth, stair stringer length, and incline angle conforming to building code.
Asphalt Calculator
Calculate asphalt tons and paving volume for driveways, roads, and resurfacing projects.
Explore Other Tool Categories
Browse our full collection of 50 free web utilities
Unit Converters
Exact metric & imperial conversions for weight, length, temperature & volume.
Math & Education
Percentage changes, fractions, square roots, geometry & statistics.
Date & Time
Calendar arithmetic, business day intervals, stopwatch & multi-counter.
Finance
Discount savings, markup, profit margins, CD returns & overtime pay.