Cubic Feet Calculator
Calculate volume in cubic feet for any shape — rooms, boxes, tanks, mulch beds, and more. Get instant conversions to cubic yards, gallons, and bag counts.
Last updated: March 2, 2026
Enter Your Measurements
ft
ft
Mulch: 2–4 in · Gravel: 4–6 in · Concrete: 4 in
ft
Results
Total Volume
80
cubic feet
Volume Conversions
Cubic Yards2.96 cu yd
Cubic Meters2.27 m³
Cubic Inches138,240 cu in
Liquid Equivalents
US Gallons598.4 gal
Liters2,265.3 L
Material Estimates
Mulch/Topsoil (2 cu ft bags)~40 bags
Gravel/Sand (est.)~4.15 tons
Calculation Steps
- Length: 10 ft = 10.000 ft
- Width: 8 ft = 8.000 ft
- Depth: 1 ft = 1.000 ft
- Volume = 10.000 × 8.000 × 1.000 = 80.000 cu ft
How to Use This Calculator
1
Pick a Shape
Choose rectangle, circle, cylinder, or triangle to match your space.
2
Select Unit
Enter measurements in feet, inches, yards, meters, or centimeters.
3
Enter Dimensions
Type in length, width, and depth. Results update instantly.
4
Read Results
Get cubic feet, cubic yards, gallons, liters, and bag counts in one view.
How We Calculate
Rectangle / Box
Volume = Length × Width × Depth Example: 10 ft × 8 ft × 1 ft = 80 cu ft
Circle / Cylinder
Volume = π × (Diameter ÷ 2)² × Height Example: 4 ft diameter × 6 ft tall = 75.4 cu ft
Triangle
Volume = (Base × Height ÷ 2) × Depth Example: 10 ft base × 8 ft height × 1 ft = 40 cu ft
Key Conversions
- • 1 cu ft = 1,728 cu in
- • 1 cu ft = 0.037 cu yd
- • 1 cu ft = 7.48 US gallons
- • 1 cu ft = 28.32 liters
- • 27 cu ft = 1 cu yd
Volume formulas based on standard geometric principles. Conversion factors per NIST Weights & Measures.