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Free cubic feet calculator. Calculate volume in cubic feet from length, width, and height. Supports multiple units including feet/inches, meters/centimeters, and more. Perfect for calculating container volumes, soil, sand, gravel, and material quantities. Real-time calculations with instant results.
Last updated: January 23, 2026
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💡 Volume Calculation
Enter length, width, and height in any unit. The calculator will convert to cubic feet. Formula: Volume = Length × Width × Height
Volume in Cubic Feet
30 ft³
Formula: 5.0000 ft × 3.0000 ft × 2.0000 ft = 30 ft³
Cubic Inches
51,840 in³
Cubic Yards
1.1111 yd³
Cubic Meters
0.8495 m³
US Gallons
224.42 gal
Conversion Facts:
Units Supported
mm, cm, m, ft, in, yd, mi
Supports metric and imperial units, plus feet/inches and meters/centimeters formats
Speed
Instant calculations
See results immediately as you enter or change dimensions
Output Units
ft³, in³, yd³, m³, gal
Results shown in cubic feet, cubic inches, cubic yards, cubic meters, and gallons
Formula
Volume = L × W × H
Each calculation shows the formula used for transparency
Use cases
Soil, Sand, Gravel
Essential for calculating material quantities for construction and landscaping projects
Applications
Boxes, Containers, Rooms
Calculate volume of any rectangular container, box, or room
For a box 5 ft × 3 ft × 2 ft:
Dimensions
5 × 3 × 2 ft
Volume
30 ft³
Our cubic feet calculator calculates the volume of a rectangular container (cuboid) in cubic feet. The formula is simple: Volume = Length × Width × Height. The calculator supports multiple units and automatically converts all dimensions to feet before calculating, ensuring accurate results regardless of the input units.
Step 1: Enter Dimensions
Enter the length, width, and height of your container. You can use different units for each dimension - the calculator will handle conversions automatically.
Step 2: Select Units
Choose the unit for each dimension from the dropdown. Options include millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, feet/inches, and meters/centimeters.
Step 3: View Results
Results appear instantly in cubic feet, with conversions to cubic inches, cubic yards, cubic meters, liters, and US gallons. The calculation formula is also displayed.
Calculating cubic feet is straightforward: multiply the length, width, and height together. One cubic foot is a volume that fills a 1 ft × 1 ft × 1 ft cubic container.
Volume (ft³) = Length (ft) × Width (ft) × Height (ft)If all your dimensions are in feet, simply multiply them together to get cubic feet.
Calculate the volume of a box that is 5 feet long, 3 feet wide, and 2 feet high:
Volume = 5 ft × 3 ft × 2 ftVolume = 30 ft³So the box has a volume of 30 cubic feet.
When dimensions are in inches, you have two options: convert dimensions first, or convert the final volume. Both methods give the same result.
Convert each dimension from inches to feet (divide by 12), then multiply:
30 in ÷ 12 = 2.5 ft36 in ÷ 12 = 3 ft25 in ÷ 12 = 2.083 ftVolume = 2.5 × 3 × 2.083 = 15.625 ft³Multiply all dimensions in inches, then divide by 1,728 (12³):
30 in × 36 in × 25 in = 27,000 in³27,000 in³ ÷ 1,728 = 15.625 ft³Both methods give the same result: 15.625 cubic feet.
Calculating cubic feet of soil is useful for landscaping and gardening projects. The process involves determining the area and desired depth.
Step 1: Determine Area
Area = Length × Width
Example: 10 ft × 3 ft = 30 ft²
Step 2: Decide on Depth
Choose the desired thickness of soil (e.g., 0.5 ft)
Step 3: Calculate Volume
Volume = Area × Depth
Example: 30 ft² × 0.5 ft = 15 ft³
Step 4: Convert if Needed
To convert to cubic yards: 15 ft³ ÷ 27 = 0.556 yd³
Here are the conversion factors for common units to feet:
| Unit | To Feet | Example |
|---|---|---|
| Inches | ÷ 12 | 36 in = 3 ft |
| Yards | × 3 | 2 yd = 6 ft |
| Centimeters | ÷ 30.48 | 152.4 cm = 5 ft |
| Meters | × 3.28084 | 1 m = 3.28 ft |
| Millimeters | ÷ 304.8 | 304.8 mm = 1 ft |
Here are the conversion factors from cubic feet to other volume units:
This calculator is essential for various real-world applications:
Calculate material quantities for concrete, soil, sand, gravel, and other construction materials. Essential for estimating project costs and ordering materials.
Determine how much soil, mulch, or gravel you need for garden beds, pathways, or landscaping projects. Calculate volumes for raised beds and planters.
Calculate container volumes for shipping, storage planning, and space optimization. Determine how much can fit in boxes, containers, or storage units.
Calculate room volumes for HVAC sizing, paint estimates, and furniture placement. Determine storage capacity for closets, cabinets, and shelving units.
Need other conversion tools? Check out our area converter and length converter.
Get Custom Calculator for Your PlatformResult: 30 in × 36 in × 25 in = 15.625 ft³
This is a typical oven size. The volume is 15.625 cubic feet.
Result: 5 ft × 5 ft × 5 ft = 125 ft³
This is a perfect cube with each side measuring 5 feet.
Result: 10 yd × 3 yd × 0.5 yd = 405 ft³ (15 yd³)
This represents the volume of soil needed for a landscaping project.
Volume =
1 ft³
Volume =
24 ft³
Volume =
1 ft³
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