How do I calculate cubic feet?
Multiply length by width by height when all dimensions are in feet.
Cubic Feet Calculator
Find rectangular volume from length, width, and height measured in feet.
Enter dimensions in feet
Use inside dimensions when calculating container capacity.
About this converter
How to use Cubic Feet Calculator, plus the formulas and logic behind the results.
Tool description
This calculator finds the volume of a rectangular box or room and reports the result in cubic feet, liters, and cubic meters.
How to use
- Measure the length in feet.
- Enter width and height in feet.
- Select Calculate.
- Review cubic feet and metric equivalents.
Formulas & reference
ft³ = length × width × heightliters = ft³ × 28.316846592m³ = ft³ × 0.028316846592
Quick reference
- ft³ = length × width × height
- liters = ft³ × 28.316846592
- m³ = ft³ × 0.028316846592
Calculation logic
The three dimensions are multiplied to get cubic feet, then standard volume factors produce liters and cubic meters.
Results use standard stated conversion factors and may be rounded for display.
Cubic Feet Calculator FAQ
Common questions about this conversion and how to interpret the result.
How many liters are in a cubic foot?
One cubic foot equals 28.316846592 liters.
Can I use decimal feet?
Yes, including measurements such as 2.5 feet.
Does this work for irregular shapes?
No. It assumes a rectangular prism.
Are dimensions squared or cubed?
Three linear dimensions multiply to produce cubic feet.
What measurements should I use for a container?
Use internal dimensions for capacity and external dimensions for occupied space.