Cubic Feet Calculator
Calculate cubic feet volume instantly with our free calculator. Compute volume for boxes, cylinders, cones, and spheres in cubic feet. Perfect for shipping, moving, storage, construction, and appliance sizing. Convert between cu ft, cubic yards, gallons, liters and more. Key formulas: Box = L × W × H | Cylinder = π × r² × h | 1 cu yd = 27 cu ft.
Quick Cubic Feet Formulas
Master these essential formulas to calculate cubic feet volume for any shape:
Cylinder: Volume = π × radius² × height
Cone: Volume = ⅓ × π × radius² × height
Sphere: Volume = ⁴⁄₃ × π × radius³
💡 Common Sizes
💡 Common Cylinders
💡 Common Cones
💡 Common Spheres
📋 Cubic Feet Conversion Tables
Quick reference tables for converting cubic feet to other volume units:
Cubic Feet to Other Units
| Cubic Feet | Cubic Inches | Cubic Yards | Gallons (US) | Liters | Cubic Meters |
|---|---|---|---|---|---|
| 1 cu ft | 1,728 | 0.037 | 7.48 | 28.32 | 0.0283 |
| 5 cu ft | 8,640 | 0.185 | 37.40 | 141.58 | 0.142 |
| 10 cu ft | 17,280 | 0.370 | 74.81 | 283.17 | 0.283 |
| 25 cu ft | 43,200 | 0.926 | 187.01 | 707.92 | 0.708 |
| 50 cu ft | 86,400 | 1.852 | 374.03 | 1,415.84 | 1.416 |
| 100 cu ft | 172,800 | 3.704 | 748.05 | 2,831.68 | 2.832 |
| 500 cu ft | 864,000 | 18.52 | 3,740.26 | 14,158.42 | 14.16 |
| 1,000 cu ft | 1,728,000 | 37.04 | 7,480.52 | 28,316.85 | 28.32 |
Common Storage Unit Sizes
| Storage Size | Dimensions (ft) | Cubic Feet | Cubic Yards | Best For |
|---|---|---|---|---|
| 5×5 | 5 × 5 × 8 | 200 | 7.4 | Small items, boxes |
| 5×10 | 5 × 10 × 8 | 400 | 14.8 | Studio apartment |
| 10×10 | 10 × 10 × 8 | 800 | 29.6 | 1-bedroom apt |
| 10×15 | 10 × 15 × 8 | 1,200 | 44.4 | 2-bedroom apt |
| 10×20 | 10 × 20 × 8 | 1,600 | 59.3 | 3-bedroom home |
| 10×30 | 10 × 30 × 8 | 2,400 | 88.9 | 4+ bedroom home |
📐 Common Cubic Feet Calculations
Moving Box Sizes
- Small (16×12×12") = 1.33 cu ft
- Medium (18×18×16") = 3.0 cu ft
- Large (24×18×18") = 4.5 cu ft
- Extra Large (24×20×20") = 5.56 cu ft
- Wardrobe (24×24×40") = 13.33 cu ft
Appliance Capacities
- Mini Fridge: 1.5-4.5 cu ft
- Top Freezer: 14-24 cu ft
- Side-by-Side: 20-28 cu ft
- French Door: 22-32 cu ft
- Chest Freezer: 5-25 cu ft
Moving Truck Sizes
- Cargo Van: 150-250 cu ft
- 10' Truck: 368-402 cu ft
- 15' Truck: 764-850 cu ft
- 20' Truck: 1,000-1,200 cu ft
- 26' Truck: 1,400-1,700 cu ft
Cubic Feet Volume Formulas & Conversions
Essential formulas for calculating volume in cubic feet:
• Box/Rectangle: Volume = L × W × H
• Cylinder: Volume = π × r² × h
• Cone: Volume = ⅓ × π × r² × h
• Sphere: Volume = ⁴⁄₃ × π × r³
Unit Conversions:
• Cubic Inches to Cubic Feet: divide by 1,728
• Cubic Yards to Cubic Feet: multiply by 27
• Cubic Meters to Cubic Feet: multiply by 35.3147
• Cubic Feet to Gallons (US): multiply by 7.48052
• Cubic Feet to Liters: multiply by 28.3168
Quick Math:
• 1 cubic yard = 27 cubic feet = 46,656 cubic inches
• 1 cubic meter = 35.31 cubic feet = 264.17 gallons
Pro Tip: Always convert all measurements to the same unit before calculating!
🔍 Frequently Asked Cubic Feet Questions
How do I calculate cubic feet?
Multiply length × width × height when all measurements are in feet. For inches, multiply L × W × H then divide by 1,728. For yards, multiply L × W × H then multiply by 27. Example: A 10×8×6 foot room = 480 cubic feet.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in 1 cubic yard. This is because 1 yard = 3 feet, so 3 × 3 × 3 = 27. To convert cubic feet to cubic yards, divide by 27. To convert cubic yards to cubic feet, multiply by 27.
How do I convert cubic inches to cubic feet?
Divide cubic inches by 1,728 to get cubic feet. This works because 1 foot = 12 inches, so 12 × 12 × 12 = 1,728 cubic inches per cubic foot. Example: 3,456 cu in ÷ 1,728 = 2 cu ft.
How many gallons are in a cubic foot?
1 cubic foot = 7.48052 US gallons (or approximately 7.5 gallons). To convert cubic feet to gallons, multiply by 7.48. To convert gallons to cubic feet, divide by 7.48.
How do I find the cubic feet of my refrigerator?
Measure interior length, width, and height in inches, multiply them together, then divide by 1,728. Example: 28" × 24" × 60" = 40,320 cu in ÷ 1,728 = 23.3 cubic feet. Note: Shelves reduce usable space.
What is the cubic footage of a 10×10 storage unit?
A 10×10 storage unit with 8-foot ceiling = 800 cubic feet. Calculate: 10 × 10 × 8 = 800 cu ft. This equals about 29.6 cubic yards or enough space for a 1-bedroom apartment's contents.
How do I calculate cubic feet for shipping?
Measure the box's length, width, and height in inches, multiply all three, then divide by 1,728. Shipping companies often calculate by dimensional weight: (L × W × H) ÷ 139 for domestic or ÷ 166 for international.
How many cubic feet is a standard moving box?
Moving boxes range from 1.5 to 6+ cubic feet: Small (1.5 cu ft), Medium (3.0 cu ft), Large (4.5 cu ft), Extra Large (5.5 cu ft), and Wardrobe boxes (13+ cu ft). Book boxes are about 1.5 cu ft.
How do I convert cubic feet to liters?
Multiply cubic feet by 28.3168 to get liters. Example: 5 cu ft × 28.3168 = 141.58 liters. To convert liters to cubic feet, divide by 28.3168.
How do I calculate cubic feet from square feet?
Multiply square feet by height in feet to get cubic feet. Square feet measures area (2D), while cubic feet measures volume (3D). Example: 100 sq ft × 8 ft ceiling = 800 cu ft.
How much mulch do I need in cubic feet?
Calculate: (Area in sq ft × Depth in inches) ÷ 12 = cubic feet needed. For 100 sq ft with 3" depth: (100 × 3) ÷ 12 = 25 cu ft. Add 10% extra for settling and irregularities.
What's the difference between CFM and cubic feet?
CFM = Cubic Feet per Minute, measuring airflow rate. Cubic feet measures static volume. A fan rated at 100 CFM moves 100 cubic feet of air every minute. Used for HVAC, ventilation, and air compressor ratings.
👥 Who Uses Cubic Feet Calculators?
Shipping & Logistics
Calculate freight volume, determine shipping costs, optimize container packing, and estimate dimensional weight for packages.
Moving & Storage
Estimate moving truck size, calculate storage unit capacity, plan packing, and determine how much space your belongings require.
Construction & Landscaping
Calculate concrete volume, estimate mulch and soil needs, measure excavation amounts, and plan material orders.
Home Improvement
Determine room volume for HVAC sizing, calculate insulation needs, estimate paint coverage, and plan renovation projects.
Appliance Shopping
Compare refrigerator capacities, evaluate freezer sizes, choose the right washer/dryer, and understand storage specifications.
Tanks & Aquariums
Calculate water tank capacity, determine aquarium volume, estimate pool water needs, and size water storage systems.
❓ Cubic Feet Calculator FAQ
A cubic foot (cu ft or ft³) is a unit of volume equal to a cube measuring 1 foot on each side. It's commonly used in the US and UK for measuring storage space, shipping volume, appliance capacity, and construction materials. One cubic foot equals 1,728 cubic inches, 7.48 gallons, or 28.32 liters.
Our calculator uses exact mathematical formulas and provides results accurate to multiple decimal places. The accuracy depends on your input measurements—always measure carefully and use the same unit for all dimensions. For irregular shapes, break them into regular shapes and add the volumes.
Break irregular shapes into regular shapes, calculate each separately, then add the volumes together. For an L-shaped room, divide it into two rectangles. For complex containers, use the water displacement method: fill with water, then measure the water volume.
Shipping companies use cubic feet to calculate dimensional weight (DIM weight), which determines shipping costs for lightweight but large packages. The formula is typically (L × W × H in inches) ÷ 139 for domestic shipping. You're charged for the greater of actual weight or dimensional weight.
For slabs: Length (ft) × Width (ft) × Thickness (ft). Remember to convert inches to feet for thickness (divide by 12). Example: 10' × 10' × 0.33' (4 inches) = 33 cu ft. Concrete is often sold by cubic yard, so divide by 27. Add 5-10% extra for waste.
Board feet is used specifically for lumber: 1 board foot = 12" × 12" × 1" thick = 144 cubic inches. Cubic feet measures any volume. To convert board feet to cubic feet, divide by 12. A 2×4×8 board is 5.33 board feet or about 0.44 cubic feet.
1 cubic foot of water weighs approximately 62.4 pounds (28.3 kg) at room temperature. This is useful for calculating tank loads, pool weight, and water storage requirements. Sea water is slightly heavier at about 64 pounds per cubic foot due to salt content.
Multiply cubic feet by 0.0283168 to get cubic meters. Alternatively, divide cubic feet by 35.3147. Example: 100 cu ft × 0.0283168 = 2.83 cubic meters. This is useful for international shipping and scientific calculations.
This calculator uses standard geometric formulas for volume calculation. All conversions are based on internationally recognized standards: 1 cubic foot = 1,728 cubic inches (exact), 1 cubic yard = 27 cubic feet (exact), 1 cubic foot ≈ 7.48052 US gallons.
Last verified and updated: February 15, 2026
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