How the estimate works
Tell the estimator how many bedrooms you have, how many people live there, how full the home is, and which extra rooms you need to pack. It returns a box count broken down by box type, a recommended rental-truck size based on the total load volume, and a rough budget for boxes, tape, and paper, all in a single pass. The counts lean slightly high on purpose, because running out of boxes mid-pack costs more time than a few spares cost in cash.
Truck size is worked out from a volume estimate that includes a furniture allowance, not from bedroom count alone, because two same-sized homes can differ hugely once you add a full garage or basement. If the recommendation sits near the top of a size, book the next size up: a slightly large truck is far cheaper than a second trip.