Cubic Feet Calculator

A cubic foot is a unit of volume equal to the space inside a cube measuring one foot on every side. It contains 1,728 cubic inches and equals exactly 0.028316846592 cubic meters, or 28.316846592 liters. Cubic feet are widely used for rooms, refrigerators, freezers, storage units, shipping cartons, soil, natural gas, and construction materials in countries that use customary measurements. This cubic feet calculator converts among common metric and customary volume units. It uses cubic feet as an internal reference, then applies standard conversion factors to reach the selected destination. One cubic yard contains exactly 27 cubic feet. One cubic foot contains exactly 1,728 cubic inches. Based on the exact international foot, one cubic meter contains approximately 35.31466672 cubic feet. A cubic foot also contains approximately 7.48051948 US liquid gallons. Volume conversion is different from converting a single length. Since volume has three dimensions, a linear conversion factor must be cubed. One foot is 0.3048 meter, but one cubic foot is not 0.3048 cubic meter. The correct volume factor is 0.3048 multiplied by itself three times, which gives 0.028316846592 cubic meter. This distinction prevents a common and very large conversion error. To calculate the volume of a rectangular box before converting, multiply its interior length, width, and height using the same length unit. Measurements in feet produce cubic feet directly. Measurements in inches produce cubic inches, which can be converted here. For cylinders, spheres, cones, or irregular containers, first use the appropriate geometric formula or measured capacity, then convert the resulting volume unit. Practical measurements may require allowances that a pure unit conversion cannot provide. Shipping carriers can use dimensional weight rather than physical volume. Soil, concrete, and gravel estimates often include extra material for compaction, settling, spillage, or an uneven site. Refrigerator capacity may describe total interior volume rather than usable shelf space. Tank capacity can differ because of wall thickness, fittings, or an unfilled safety margin. Apply those project-specific adjustments separately. The calculator accepts decimal values and displays enough precision for everyday planning and engineering estimates. Conversion factors are deterministic, but the final accuracy can never exceed the accuracy of the original measurement. Measure dimensions consistently, avoid mixing interior and exterior dimensions, and keep extra digits until the final step. Round only according to the needs of your project, supplier, drawing, or report.