Cubic Feet Calculator

Calculating Volume in Cubic Feet

A cubic foot is the volume of a cube measuring one foot on each side, equal to 1,728 cubic inches or approximately 7.48 gallons. This calculator converts length, width, and height measurements into cubic feet, making it essential for determining storage capacity, shipping container volumes, and material quantities. Whether you are estimating how much mulch fills a garden bed, sizing a storage unit, or calculating airflow in HVAC systems, cubic feet is the standard volume unit used across construction, logistics, and real estate in the United States.

To calculate cubic feet, simply multiply length x width x height when all measurements are in feet. If your measurements are in inches, divide each by 12 before multiplying. For irregular shapes, break the space into rectangular sections, calculate each separately, and add the results. Cylinders use the formula pi x radius squared x height. Common reference points: a standard refrigerator is about 20 cubic feet, a pickup truck bed holds roughly 50 to 80 cubic feet, and a 10x10x8 storage unit provides 800 cubic feet of space.

Cubic feet measurements are critical in several industries. In shipping, freight is often priced by dimensional weight, which converts cubic feet to pounds using a divisor (typically 139 for domestic air freight). In HVAC, room volume in cubic feet determines the air handler capacity needed -- a standard rule is 1 CFM (cubic foot per minute) per square foot of floor space. In real estate, cubic footage helps evaluate rooms with vaulted ceilings or unusual shapes where square footage alone does not convey the true sense of space. For aquariums, multiply cubic feet by 7.48 to get the water volume in gallons.