Free Cubic Feet Calculator
Enter the dimensions of a rectangular space (or box) to calculate volume in cubic feet, cubic meters, cubic inches, and gallons.
What Is a Cubic Foot?
A cubic foot (ft³) is a unit of volume. It describes how much space something takes up in three dimensions: length, width, and height. One cubic foot is the volume of a cube that is exactly 1 foot on each side.
You’ll use cubic feet for everyday tasks like:
- Estimating moving truck capacity
- Measuring storage units
- Calculating refrigerator or freezer space
- Ordering concrete, soil, mulch, or gravel
- Figuring shipping and freight volume
How to Calculate Cubic Feet
Cubic Feet = Length (ft) × Width (ft) × Height (ft)
If your measurements are not in feet, convert them first:
- Inches → Feet: divide by 12
- Yards → Feet: multiply by 3
- Meters → Feet: multiply by 3.28084
- Centimeters → Feet: divide by 30.48
Example
Suppose a box is 24 in × 18 in × 20 in:
- 24 in = 2 ft
- 18 in = 1.5 ft
- 20 in = 1.6667 ft
Volume = 2 × 1.5 × 1.6667 = 5.00 ft³
Common Conversions From Cubic Feet
| Unit | Equivalent to 1 ft³ |
|---|---|
| Cubic inches | 1,728 in³ |
| Cubic meters | 0.0283168 m³ |
| US gallons | 7.48052 gal |
| Liters | 28.3168 L |
Where This Calculator Helps Most
1) Moving and Storage
Quickly compare the total cubic feet of your boxes and furniture against truck or storage capacity.
2) Home Improvement
Use cubic feet to estimate fill material for garden beds, raised planters, trenches, or small concrete jobs.
3) Shipping and Logistics
Many carriers price large but lightweight packages by dimensional volume. Cubic feet gives you a clear baseline.
4) Appliances and Equipment
Fridges, freezers, air compressors, and some tanks are often listed in cubic feet to show internal capacity.
Tips for Accurate Results
- Measure all dimensions in the same unit before calculating.
- Round only at the final step to avoid compounding errors.
- Add an allowance (5–15%) when planning packing or loose fill materials.
- For irregular shapes, split into smaller rectangular sections and add them together.
Frequently Asked Questions
How do I calculate cubic feet from inches?
Convert each dimension from inches to feet by dividing by 12, then multiply length × width × height.
Is cubic feet the same as square feet?
No. Square feet measures area (2D), while cubic feet measures volume (3D).
Can I calculate multiple identical boxes at once?
Yes. Use the Quantity field in the calculator above to multiply total volume automatically.
What if I need cubic yards?
Divide cubic feet by 27. (Because 1 cubic yard = 27 cubic feet.)
Final Thought
A reliable cubic feet estimate saves time, money, and stress—whether you're moving, renovating, shipping, or buying materials. Use the calculator above anytime you need a fast and accurate volume result.