Methodology
How StowGauge estimates storage space
The estimate is a transparent comparison model, not a measured inventory, provider quote, or fit guarantee. This page records the current coefficients, formula, and validation status.
Current revision
Model revision: SG-CALC-2026-08-15
Last reviewed: August 15, 2026
The model is in an early evidence-building stage. Validation against representative completed rentals is still pending. The coefficients below are planning assumptions and will be revised only when observed outcomes justify a change.
The formula
Required volume = (home baseline + boxes + large items) x 1.12 x optional 1.18 aisle factor.
The result is rounded to the nearest cubic foot and matched to the smallest common unit capacity that covers it. When the estimate exceeds 2,400 cubic feet, StowGauge shows the largest common size and flags the overage instead of claiming that it fits.
Current coefficients
| Input | Planning value | How it is used |
|---|---|---|
| Room base volumes | Studio 120; 1 bed 260; 2 bed 475; 3 bed 700; 4+ bed 950 cu ft | Starting household volume before furnishing level. |
| Furnishing level | Minimal 70%; typical 90%; full 112% | Multiplies the room baseline. |
| Sealed moving box | 3 cu ft each | Added to the adjusted home volume. |
| Large items | Sofa 55; mattress 35; appliance 28; dining set 45 cu ft | Added per item as coarse planning allowances. |
| Packing allowance | 12% | Allows for imperfect stacking and protective material. |
| Access aisle | 18%, optional | Adds working space when items need to remain reachable. |
Unit capacity assumptions
Common unit capacities use nominal floor area multiplied by an 8-foot planning height: 5 x 5 is 200 cu ft, 5 x 10 is 400, 10 x 10 is 800, 10 x 15 is 1,200, 10 x 20 is 1,600, and 10 x 30 is 2,400. A provider's usable interior can differ because of ceiling height, columns, door placement, or other obstructions.
Physical-fit check
The optional measurement check compares the entered rectangular item dimensions with the nominal unit footprint, an entered or default 8-foot planning height, and the entered door opening. It checks simple straight orientations. It does not model turns, hallways, elevators, stairs, vehicle clearance, flexible items, disassembly, or safe handling.
What the result can and cannot support
- Use it to narrow the common sizes worth comparing and to identify measurements that still need confirmation.
- Do not treat it as proof that every item fits, a promise of availability, or a substitute for the facility's dimensions and rental terms.
- Recheck the inventory when the result has a tight capacity margin or the load includes unusually shaped, fragile, or non-stackable items.
Questions about this methodology can be sent to [email protected].