Storage planning tool
Storage unit size calculator
Build a structured inventory, set a conservative usable stack height and access aisle share, then compare the estimate with nominal floor sizes before checking a real facility.
Plan nominal storage area
Estimate occupied floor area from measured inventory, a conservative stack height, and an access aisle share.
Set a conservative usable height; this does not assess stacking safety.
Share of total floor area reserved for access. Tested range: 0-50%.
Inventory
Required planning area
23.25 sq ft
Occupied estimate: 18.60 sq ft
Calculated required area is within this nominal boundary; this is not a fit guarantee.
Occupied estimate23.25 sq ft
With aisle share50 sq ft
Nominal boundary
Storage area estimate calculated
Required planning area: 23.25 sq ft. Smallest listed candidate: 5 × 10 nominal unit.
Required planning area: 23.25 sq ft
Volume-and-footprint screening only, not a packing or facility decision.
Input recap
- Rows
- 2
- Usable stack height
- 5.00 ft
- Access aisle share
- 20%
- Entry units
- Imperial
Assumptions
- Volume divided by usable stack height is a planning abstraction, not a packing algorithm or a placement plan.
- Items use full rectangular envelopes; no compression, nesting, shape, weight, stackability, or packing efficiency is inferred.
- Usable stack height is a user-set conservative input, not a stacking-safety statement.
- Unit labels and floor dimensions are nominal provider sizes; actual interior dimensions and availability vary by facility.
- Item assumptions and storage-unit sizes use dataset version 2026-07-10.2.
Inventory composition
Each row uses its complete rectangular envelope.
| Item | Envelope | Qty | Volume | Basis |
|---|---|---|---|---|
| U-Haul medium moving box | 18.125 × 18 × 16 in | 10 | 30.21 cu ft | official product dimensionsCalculated as a rectangular envelope from current U-Haul product dimensions. |
| Three-seat sofa envelope | 84 × 38 × 34 in | 1 | 62.81 cu ft | editorial assumptionEditorial rectangular planning envelope; measure the actual sofa. It is not a manufacturer or industry standard. |
Calculation
93.01 cu ft ÷ 5.00 ft = 18.60 sq ft; 18.60 sq ft ÷ (1 - 20%) = 23.25 sq ft
Occupied floor area = total item volume ÷ usable stack height. Required area = occupied area ÷ (1 - aisle share).
Candidate comparison
| Nominal unit | Area | Area comparison | Footprint screen |
|---|---|---|---|
| 5 × 5 nominal unit | 25 sq ft | 1.75 sq ft remaining | 1 item footprint warning |
| 5 × 10 nominal unit | 50 sq ft | 26.75 sq ft remaining | No footprint conflict found |
| 5 × 15 nominal unit | 75 sq ft | 51.75 sq ft remaining | No footprint conflict found |
| 10 × 10 nominal unit | 100 sq ft | 76.75 sq ft remaining | No footprint conflict found |
| 10 × 15 nominal unit | 150 sq ft | 126.75 sq ft remaining | No footprint conflict found |
| 10 × 20 nominal unit | 200 sq ft | 176.75 sq ft remaining | No footprint conflict found |
| 10 × 25 nominal unit | 250 sq ft | 226.75 sq ft remaining | No footprint conflict found |
| 10 × 30 nominal unit | 300 sq ft | 276.75 sq ft remaining | No footprint conflict found |
Smallest listed candidate satisfying both checks: 5 × 10 nominal unit. Verify the actual unit before renting.
Oversized footprint review: Item 2 exceeds one or more smaller nominal units.
Limits to verify
Verify the actual unit interior, door opening, columns, ceiling, fire rules, stacking and weight rules, access aisle, and availability with the facility.
This planner does not infer door clearance, loading path, access, stacking safety, climate features, security, or facility availability.
Oversized-item checks compare only each rectangular L × W footprint with nominal floor dimensions in two planar orientations.
Check the actual unit interior, door opening, columns, ceiling, fire rules, stacking and weight rules, access aisle, and availability with the facility. This is not a packing algorithm.
Sources and dataset
Nominal floor labels come from the current U-Haul size guide. Each facility offers a different size mix; availability and actual interior dimensions vary.
Predefined furniture rows are editorial envelopes. Measure every actual item.
Source check: July 10, 2026.
Dataset version: 2026-07-10.2
- U-Haul storage unit size guide — nominal 5 × 5 through 10 × 30 labels.
- U-Haul small moving box — current product dimensions.
Nominal size reference
Storage unit size chart
Compare the eight nominal floor sizes used by this calculator. The provider groups these labels as small, medium, or large, but the label alone does not describe the usable interior.
| Nominal size | Floor area | Provider size group |
|---|---|---|
| 5 × 5 ft | 25 sq ft | Small |
| 5 × 10 ft | 50 sq ft | Small |
| 5 × 15 ft | 75 sq ft | Medium |
| 10 × 10 ft | 100 sq ft | Medium |
| 10 × 15 ft | 150 sq ft | Medium |
| 10 × 20 ft | 200 sq ft | Large |
| 10 × 25 ft | 250 sq ft | Large |
| 10 × 30 ft | 300 sq ft | Large |
Before renting, verify the actual interior dimensions, door opening, columns, facility rules, and availability. Nominal labels and offered sizes vary by location.
Provider grouping checked 2026-07-10. See Sources and dataset for the recorded guide and dataset details.
Guides for this calculation
Check the measurements, assumptions, and worked examples in the related guides. Return to Storage planning for the full decision sequence, or review the tool methodology for formulas and limits.