Cubic Feet Calculator - Calculate Volume in Cubic Feet (ft³)
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 Result
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:
- • 1 cubic foot = 1,728 cubic inches (12³)
- • 1 cubic foot = 0.037037 cubic yards (1/27)
- • 1 cubic foot = 0.0283168 cubic meters
- • 1 cubic foot = 7.48052 US gallons
- • Formula: Volume = Length × Width × Height
- • All dimensions are converted to feet before calculation
Cubic Feet Calculator Features
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
Quick Example Result
For a box 5 ft × 3 ft × 2 ft:
Dimensions
5 × 3 × 2 ft
Volume
30 ft³
How Our Cubic Feet Calculator Works
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.
How to Use the Calculator
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.
How to Calculate Cubic Feet
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.
Formula
Volume (ft³) = Length (ft) × Width (ft) × Height (ft)If all your dimensions are in feet, simply multiply them together to get cubic feet.
Example: Calculate Volume of a Box
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.
How to Calculate Cubic Feet from Inches
When dimensions are in inches, you have two options: convert dimensions first, or convert the final volume. Both methods give the same result.
Method 1: Convert Dimensions First
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 ft³Method 2: Convert Volume After
Multiply 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
Calculating cubic feet of soil is useful for landscaping and gardening projects. The process involves determining the area and desired depth.
Step-by-Step Process
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
Unit Conversion Reference
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 |
Common Volume Conversions
Here are the conversion factors from cubic feet to other volume units:
Cubic Feet Conversions
- • 1 ft³ = 1,728 in³ (12³)
- • 1 ft³ = 0.037037 yd³ (1/27)
- • 1 ft³ = 0.0283168 m³
- • 1 ft³ = 28.3168 L
- • 1 ft³ = 7.48052 US gal
Reverse Conversions
- • 1 in³ = 0.0005787 ft³
- • 1 yd³ = 27 ft³
- • 1 m³ = 35.3147 ft³
- • 1 L = 0.0353147 ft³
- • 1 US gal = 0.133681 ft³
Practical Applications
This calculator is essential for various real-world applications:
Construction & Building
Calculate material quantities for concrete, soil, sand, gravel, and other construction materials. Essential for estimating project costs and ordering materials.
Landscaping & Gardening
Determine how much soil, mulch, or gravel you need for garden beds, pathways, or landscaping projects. Calculate volumes for raised beds and planters.
Shipping & Storage
Calculate container volumes for shipping, storage planning, and space optimization. Determine how much can fit in boxes, containers, or storage units.
Home Improvement
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 PlatformCubic Feet Calculator Examples
Input:
- Length: 30 in
- Width: 36 in
- Height: 25 in
Calculation:
- Convert to feet: 30 ÷ 12 = 2.5 ft
- Convert to feet: 36 ÷ 12 = 3 ft
- Convert to feet: 25 ÷ 12 = 2.083 ft
- Volume = 2.5 × 3 × 2.083
- Volume = 15.625 ft³
Result: 30 in × 36 in × 25 in = 15.625 ft³
This is a typical oven size. The volume is 15.625 cubic feet.
Input:
- Length: 5 ft
- Width: 5 ft
- Height: 5 ft
Calculation:
- Volume = Length × Width × Height
- Volume = 5 × 5 × 5
- Volume = 125 ft³
Result: 5 ft × 5 ft × 5 ft = 125 ft³
This is a perfect cube with each side measuring 5 feet.
Input:
- Length: 10 yd
- Width: 3 yd
- Height: 0.5 yd
Calculation:
- Convert to feet: 10 × 3 = 30 ft
- Convert to feet: 3 × 3 = 9 ft
- Convert to feet: 0.5 × 3 = 1.5 ft
- Volume = 30 × 9 × 1.5
- Volume = 405 ft³
Result: 10 yd × 3 yd × 0.5 yd = 405 ft³ (15 yd³)
This represents the volume of soil needed for a landscaping project.
1ft × 1ft × 1ft
Volume =
1 ft³
2ft × 3ft × 4ft
Volume =
24 ft³
12in × 12in × 12in
Volume =
1 ft³
Frequently Asked Questions
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