Should space cost per unit rise when utilization falls?

No. Rent is paid on the whole footprint either way, so the per-unit load is set by output, not utilization. Lower utilization raises only the unused share, which this page reports separately.

What counts as unused floor?

Any part of the entered area not used for production at the measured time: aisles wider than needed, blocked corners, obsolete fixtures or an empty staging zone.

How do I use the per-occupied-hour figure?

It turns the annual space cost into a run-hour load. Compare it with the cell's hourly output value or with a lease option when deciding whether to run the area longer.

Why allocate space cost per unit at all?

It puts a floor cost beside labor, material and machine cost when you price a part, so layout decisions carry a number. It is an allocation, not a cash flow.

Costing calculator

Floor Space Cost Calculator

Price the floor a cell or line occupies, per year, per unit and per occupied hour. Utilization shifts only the unused share, because the whole footprint is paid for either way.

What this calculator does

Annual and per-unit space cost from occupied area, facility rate, output and usage data, with the cost of unused space.

Formula used

Annual space cost = occupied floor space × facility cost per square foot per year
Space cost per unit = annual space cost ÷ annual output
Cost of unused space = annual space cost × (1 − space utilization ÷ 100)
Cost per occupied hour = annual space cost ÷ annual occupied hours

Inputs explained

Occupied Floor Space: Floor area this cell or line occupies, from the layout.
Facility Cost: Annual rent, utilities, tax and insurance per square foot.
Annual Output: Good units made in the area over a year.
Space Utilization: Share of the area used for production, from a walkthrough.
Annual Occupied Hours: Hours the area is staffed or running each year.

How to use the result

Best suited to comparing layouts on cost per unit, pricing the floor a cell frees, reviewing an idle storage area.
A straight allocation spreads cost evenly per unit, so high-volume parts carry the same share as low-volume ones. Shared aisles, offices and storage outside the entered area are not included. Utilization comes from a walkthrough or layout, so it reflects the day it was measured.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

Should space cost per unit rise when utilization falls? No. Rent is paid on the whole footprint either way, so the per-unit load is set by output, not utilization. Lower utilization raises only the unused share, which this page reports separately.
What counts as unused floor? Any part of the entered area not used for production at the measured time: aisles wider than needed, blocked corners, obsolete fixtures or an empty staging zone.
How do I use the per-occupied-hour figure? It turns the annual space cost into a run-hour load. Compare it with the cell's hourly output value or with a lease option when deciding whether to run the area longer.
Why allocate space cost per unit at all? It puts a floor cost beside labor, material and machine cost when you price a part, so layout decisions carry a number. It is an allocation, not a cash flow.

Last reviewed 2026-10-01.