No standard exists, and retailers' bands drift upward. Consumer Reports gives one firm number, for a king-size comforter, and I'd let your biggest wash and your doorway decide.
November 2, 2026
Three retailers and brands land near 5 cubic feet per adult, and Liebherr says half that or less. I'd use the common figure as a start, then let the doorway overrule it.
November 2, 2026
Abt counts one serving per quart, while NBC Select's experts feed about five from a 6-quart pot. I'd start from household size, then go up a size for meal prep or anything that needs pressure.
November 2, 2026
I found no standards body that publishes vacuum sizes by floor area, and the guides that try disagree. I'd decide by carpet share and stairs first, then floor area.
November 2, 2026