Cubic Feet Calculator: Free Online Volume Calculator
Use our free cubic feet calculator to determine the volume of any space or object in cubic feet. Whether you are planning a concrete pour, estimating gravel for a landscaping project, or calculating the capacity of a storage container, this tool converts length, width, and height measurements into cubic feet instantly. Supports input in feet, inches, and mixed units.
How to use this calculator.
- Enter your dimensions. Input the length, width, and height of the space or object you want to measure.
- Choose your unit for each dimension. Select feet, inches, or a combination. The calculator handles mixed units automatically.
- Click calculate. The result displays the total volume in cubic feet instantly.
- Review equivalent units. Results also show the equivalent in cubic yards and cubic meters for easy reference.
How do you calculate cubic feet volume?
To calculate volume in cubic feet, multiply the length by the width by the height. If any dimensions are in inches, divide by 12 to convert to feet first.
Volume (cu ft) = Length (ft) × Width (ft) × Height (ft)
Cubic Feet to Cubic Yards: cu yd = cu ft ÷ 27
Cubic Feet to Cubic Meters: cu m = cu ft × 0.0283168
Where:
- Length: The longest horizontal dimension, in feet or inches.
- Width: The shorter horizontal dimension, in feet or inches.
- Height: The vertical dimension (or depth for fill calculations), in feet or inches.
Example calculation.
Let us calculate the volume of a raised garden bed.
Scenario: You are building a garden bed that is 8 feet long, 4 feet wide, and 18 inches deep.
- Convert depth to feet: 18 inches ÷ 12 = 1.5 ft
- Calculate volume: 8 ft × 4 ft × 1.5 ft = 48 cu ft
- Convert to cubic yards (optional): 48 ÷ 27 = 1.78 cu yd
Result: The garden bed holds 48 cubic feetof soil, equivalent to approximately 1.78 cubic yards.
Tips from the field.
- Cubic feet is the go-to unit for appliance capacities.Refrigerators, freezers, and ovens are rated in cubic feet. A standard refrigerator is 18–25 cubic feet.
- Shipping and moving companies charge by cubic feet.Knowing the cubic footage of your belongings helps estimate moving truck size and cost.
- One cubic foot of water weighs 62.4 pounds. This is a useful reference for estimating water tank weights and structural loads on floors and decks.
Disclaimer: This calculator provides estimates for planning purposes only. Always measure carefully and add a waste factor of 5–10% for construction materials. PavementCalculator.com assumes no liability for material overages or shortages.
Cost, price, and density figures on this page reflect approximate U.S. averages as of August 2026 and vary by region, supplier, and material availability.
Frequently asked questions.
How do you calculate cubic feet?
Multiply length × width × height (all in feet). For example, a box that is 10 ft long, 10 ft wide, and 10 ft high has a volume of 1,000 cubic feet. Our calculator above does this automatically and also converts to cubic yards, cubic meters, and gallons.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard (3 ft × 3 ft × 3 ft = 27 cu ft). To convert cubic feet to cubic yards, divide by 27. Our calculator shows both measurements side by side.
How many gallons are in a cubic foot?
One cubic foot equals approximately 7.48 US liquid gallons. This is useful for calculating water volume in tanks, pools, or containers.
What is the difference between cubic feet and square feet?
Square feet measure area (two-dimensional: length × width), while cubic feet measure volume (three-dimensional: length × width × height). For example, a room with a 10 ft × 10 ft floor has 100 sq ft, but if the ceiling is 8 ft high, it has 800 cubic feet of volume.
How do I calculate cubic feet from inches?
Convert your inch measurements to feet first by dividing by 12, then multiply length × width × height. For example, 120 inches × 120 inches × 120 inches = (120/12) × (120/12) × (120/12) = 10 × 10 × 10 = 1,000 cubic feet. Alternatively, calculate cubic inches first (1,728,000) and divide by 1,728.