What Is Cubic Feet in Moving?

A cubic foot is just a unit of volume. Picture a cube one foot tall, one foot wide, one foot deep. When a mover prices your shipment in cubic feet, they're estimating how many of those cubes your boxes, furniture, and crates will fill once everything is stacked on the truck. A queen mattress runs about 25–30 cu ft. A standard 3-seat sofa is 50–70 cu ft. A medium moving box is roughly 3 cu ft.

A weight-based estimate has a built-in check: any carrier can drive across a certified CAT scale, weigh the truck loaded and empty, and the difference is your real weight. Cubic feet has no equivalent. The "measurement" happens when the foreman eyeballs the truck at pickup, and there's no way for you to recount it after they drive away. That ambiguity is exactly why low-cost brokers — not asset-owning carriers — push cubic-foot quotes the hardest.

It almost always plays out the same way: a phone or web rep estimates your move at 600 cu ft. You sign a "binding" estimate based on that number. On move day the crew loads the truck, then claims you actually filled 950 cu ft and hands you a revised bill that's 50% higher — with your household goods already on their truck. Because you didn't get a visual survey and you have no way to verify the count, you pay or you lose your stuff. This is the single most common interstate moving complaint filed with the FMCSA.

If a company insists on cubic-foot pricing, demand three things: (1) a video or in-home survey before the quote is binding, (2) a written cap that the number cannot exceed without your written consent, and (3) the carrier's US DOT and MC numbers so you can verify on the FMCSA SAFER database that they're the company actually driving the truck — not a broker reselling the job. If they refuse any of these, walk.

The accepted industry conversion is 7 lb per cubic foot, which means a 5,000-lb shipment is roughly 715 cubic feet. The conversion gets noisy at the extremes — densely packed book boxes might run 25–35 lb per cu ft, while pillows and bedding might run 1–2 lb per cu ft. For most household moves the 7-lb rule is close enough to compare a weight-based binding estimate against a cubic-foot quote and spot a lowball.

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