Cubic Feet Calculator — Volume in Cubic Feet, Yards & Meters

Cubic feet (cu ft or ft³) measures three-dimensional volume — how much space something occupies or how much material you need to fill a space. It's used for shipping containers, room volume, concrete orders, mulch, soil, gravel, and storage capacity.

The CalcHub Cubic Feet Calculator computes volume for any rectangular, cylindrical, or irregular shape.

Basic Formula

Cubic Feet = Length (ft) × Width (ft) × Height (ft)

Length	Width	Height	Cubic Feet
4 ft	3 ft	2 ft	24 cu ft
6 ft	4 ft	3 ft	72 cu ft
10 ft	8 ft	5 ft	400 cu ft
12 ft	10 ft	8 ft	960 cu ft
20 ft	15 ft	10 ft	3,000 cu ft

Unit Conversions

From	To	Multiply by
1 cubic foot	cubic inches	1,728
1 cubic foot	cubic meters	0.02832
1 cubic foot	liters	28.317
1 cubic foot	gallons (US)	7.481
1 cubic yard	cubic feet	27
1 cubic meter	cubic feet	35.315

Key: 1 cubic yard = 27 cubic feet (3×3×3). This is the most important conversion for construction materials.

Shipping Container Volumes

Container Type	Internal Volume (cu ft)	Approx (cu m)
20' standard	1,172 cu ft	33.2 m³
40' standard	2,390 cu ft	67.7 m³
40' high cube	2,694 cu ft	76.3 m³
Moving box (small)	1.5 cu ft	0.04 m³
Moving box (medium)	3.0 cu ft	0.08 m³
Moving box (large)	4.5–6.0 cu ft	0.13–0.17 m³

Construction Materials

Concrete

Concrete is ordered by cubic yards (US) or cubic meters (India/metric):

Slab Dimensions	Thickness	Cubic Feet	Cubic Yards	Cubic Meters
10×10 ft	4" (0.33 ft)	33	1.22	0.93
20×10 ft	4"	67	2.48	1.89
20×20 ft	6" (0.5 ft)	200	7.41	5.66
30×30 ft	4"	300	11.11	8.50

Always order 10% extra for waste, uneven ground, and spillage.

Mulch / Soil / Gravel

These materials are sold by cubic yard:

Area (sq ft)	2" Deep	3" Deep	4" Deep	6" Deep
100	0.62 yd³	0.93 yd³	1.23 yd³	1.85 yd³
200	1.23 yd³	1.85 yd³	2.47 yd³	3.70 yd³
500	3.09 yd³	4.63 yd³	6.17 yd³	9.26 yd³
1,000	6.17 yd³	9.26 yd³	12.35 yd³	18.52 yd³

Formula: Cubic yards = (Area in sq ft × Depth in inches) / 324

Room Volume (HVAC)

Room volume determines AC and heater sizing:

Room (sq ft)	8 ft ceiling	9 ft ceiling	10 ft ceiling
120	960 cu ft	1,080 cu ft	1,200 cu ft
200	1,600 cu ft	1,800 cu ft	2,000 cu ft
300	2,400 cu ft	2,700 cu ft	3,000 cu ft
500	4,000 cu ft	4,500 cu ft	5,000 cu ft

Measuring in Inches? Convert First

If your measurements are in inches: divide each by 12 to get feet, then multiply.

Example: Box is 24" × 18" × 12" = 2 ft × 1.5 ft × 1 ft = 3 cubic feet

Or: (24 × 18 × 12) / 1,728 = 5,184 / 1,728 = 3 cubic feet

How to Use the Calculator

1. Open the CalcHub Cubic Feet Calculator
2. Enter length, width, and height (in feet, inches, or meters)
3. See: volume in cubic feet, cubic yards, cubic meters, liters, and gallons

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How many cubic feet is a refrigerator?

Mini fridge: 3–5 cu ft. Standard: 18–22 cu ft. French door: 22–28 cu ft. Side-by-side: 20–26 cu ft. This is internal usable volume.

What's the difference between cubic feet and board feet?

Cubic feet measures 3D volume. Board feet measures lumber volume: 1 board foot = 1 ft × 1 ft × 1 inch (144 cubic inches or 1/12 cubic foot). Board feet is used exclusively for lumber pricing.

How do I calculate cubic feet for an irregular shape?

Fill the space with water (if possible) and measure the water volume. Otherwise, approximate by breaking the shape into rectangles and triangles, calculate each, and sum them.

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Related Calculators

• Volume Calculator — any 3D shape
• Concrete Calculator — concrete needed in cu yd
• Gravel Calculator — material volume and weight
• Area Calculator — 2D area calculations