Cubic Feet Calculator: Volume Formula & Conversions
Cubic feet measure how much space something occupies in three dimensions — a moving crate, a storage unit, a raised bed, or a fish tank. A free cubic feet calculator handles the multiplication and unit conversion so you trust the number before you buy materials or book freight.
This guide covers the core formula, common conversions, and practical examples. For flat surface area, start with our square footage guide; for gravel weight estimates, see the gravel calculator guide.
Calculate volume in seconds
Convert L × W × H into cubic feet, yards, gallons, and liters — free in your browser.
The Cubic Feet Formula
All three dimensions must use the same unit — ideally feet. A box 4 ft × 3 ft × 2 ft = 24 cubic feet. A raised bed 8 ft × 4 ft × 0.5 ft deep = 16 cubic feet of soil.
Convert Other Units to Feet First
- Inches → feet: Divide by 12
- Yards → feet: Multiply by 3
- Meters → feet: Multiply by 3.28084
- Centimeters → feet: Divide by 30.48
Or enter units directly in the ToolMars cubic feet calculator.
Useful Volume Conversions
1 cubic yard = 27 cubic feet
1 cubic foot ≈ 7.48052 US gallons
1 cubic foot ≈ 28.3168 liters
1 cubic foot ≈ 0.028317 cubic meters
Landscaping suppliers often sell by the cubic yard; aquariums and tanks use gallons or liters; international shipping uses cubic meters.
Real-world uses
- Estimating moving truck or storage unit capacity
- Ordering soil, mulch, or concrete by volume
- Checking package dimensions against carrier limits
- Pair with the Gravel Calculator for weight and tonnage estimates
Calculate volume in seconds
Convert L × W × H into cubic feet, yards, gallons, and liters — free in your browser.
Conclusion
Volume errors cost money — too little soil mid-project, too much freight on a shipment. Measure length, width, and height, convert to feet, and verify with the ToolMars Cubic Feet Calculator before you commit.
Frequently Asked Questions
How do you calculate cubic feet?
Length × width × height in feet = volume in ft³.
Gallons per cubic foot?
About 7.48052 US gallons.
Cubic feet in a cubic yard?
Exactly 27. Divide ft³ by 27 for cubic yards.
What is cubic feet used for?
Shipping, storage, landscaping materials, and liquid capacity.
Can I enter inches or meters?
Yes — the tool converts before calculating.
Cubic feet vs square feet?
Sq ft = flat area. Cubic ft = 3D volume with height included.
Soil or mulch in cubic feet?
L × W × depth in feet. Divide by 27 for cubic yards.