Live planning model
Turn an inventory into usable truck capacity
Count packed boxes by measured size, add furniture and irregular items, then protect the estimate with an explicit loading allowance. Trips are rounded up because a fractional last trip still requires a vehicle movement.
| Inventory or capacity line | Count or factor | Unit volume or basis | Computed cubic feet |
|---|
Current calculation process
Formula, default substitution, intermediate quantities, and check
V_adjusted = [sum(count_i x volume_i) + furniture] x (1 + allowance); trips = ceil(V_adjusted / truckCapacity)
All volume is in cubic feet. Counts must be whole and non-negative, the loading allowance may be 0% to 50%, and truck capacity must be positive.
Five-step inventory method
Measure before reserving a truck
- Count packed boxes by actual outside dimensions or a reliable occupied-volume specification.
- Estimate furniture and irregular-item envelope volume, including disassembly choices and protective wrapping.
- Add a loading allowance for voids, blankets, wheel wells, and geometry that prevents perfect stacking.
- Enter usable cargo volume for the specific truck configuration; do not substitute payload pounds.
- Review the whole-trip ceiling and unused capacity, then retain the inventory and current report.
Five volume concepts
Why cubic feet and weight answer different questions
Exterior volume
A box occupies its outside length x width x height even when internal packing leaves voids.
Furniture envelope
Sofas and chairs consume bounding space that may exceed material volume because other items cannot fill every cavity safely.
Loading allowance
An explicit percentage prevents hidden optimism but should reflect the packing method rather than a universal rule.
Ceiling rule
Trips use ceil, because 1.01 truckloads require two vehicle loads unless inventory is reduced.
Utilization basis
Utilization divides adjusted shipment volume by capacity purchased across all whole trips.
Symbols and default substitution
Trace occupied volume
| Symbol | Meaning | Default | Unit |
|---|---|---|---|
| n_i | Box count by size | 24, 18, 10 | boxes |
| v_i | Occupied volume per box | 1.5, 3, 4.5 | cu ft/box |
| F | Furniture/irregular volume | 520 | cu ft |
| a | Packing allowance | 12% | decimal |
| C | Usable capacity per trip | 850 | cu ft |
| N | Trips | solved with ceil | whole trips |
Default substitution: base = 24 x 1.5 + 18 x 3 + 10 x 4.5 + 520; adjusted = base x 1.12; trips = ceil(adjusted / 850). The final capacity check proves the selected whole-trip count covers the adjusted volume.
Three operational lenses
Use the result to improve the load
Inventory reduction
If adjusted volume barely crosses a trip boundary, identify low-value bulky items whose disposal or donation could remove an entire trip.
Vehicle selection
Compare published usable cargo dimensions, wheel-well intrusion, door opening, and whether the inventory can be loaded in the assumed orientation.
Weight cross-check
A volume fit can still exceed payload or axle limits. Obtain a separate weight estimate before travel.
Two load cases
Normal and boundary behavior
Mixed apartment inventory
The default inventory combines three box classes with surveyed furniture, then applies a 12% geometry allowance. The household uses unused capacity to decide whether a smaller truck is credible.
Empty inventory
Zero box counts and zero furniture volume produce zero adjusted volume and zero trips. Capacity remains positive so the model is valid without inventing a trip.
Terms
Load-planning vocabulary
- Cubic foot
- A volume one foot long, wide, and high.
- Envelope volume
- Bounding space occupied by an irregular item.
- Usable capacity
- Cargo space realistically available after vehicle intrusions.
- Packing allowance
- Additional modeled volume for imperfect loading.
- Utilization
- Adjusted volume divided by purchased whole-trip capacity.
- Payload
- Permitted cargo weight, a separate constraint from volume.
Truck-usage questions
Frequently asked questions
How do I find box volume?
Multiply exterior length, width, and height in inches, then divide by 1,728 to convert cubic inches to cubic feet.
Why add an allowance after measuring furniture?
The allowance represents loading voids, blankets, wheel wells, and geometry that measured item volumes do not capture.
Is truck volume the same as payload?
No. Volume measures space; payload measures weight. A shipment must satisfy both constraints.
Why are trips rounded up?
A partial final load still requires another vehicle load. The model therefore uses the mathematical ceiling.
Can utilization exceed 100%?
Not after trips are rounded up. If one trip is insufficient, the denominator expands to the capacity of the next whole trip.
Should I include dismantled furniture at assembled size?
Use the space it will occupy during transport. If it will be disassembled and nested, document and measure that loading configuration.
Limits and evidence
Volume fit does not authorize a load
- The model does not check payload, axle, towing, licensing, or road limits.
- Furniture volume and loading allowance depend on disassembly, protection, and loader skill.
- Published cargo volume may not be fully usable for the entered item shapes.
- Fragile, hazardous, temperature-sensitive, and prohibited goods need separate handling decisions.
Evidence record: retain item counts, dimensions, photos, disassembly plan, truck specification, payload check, and exported ledger. This is a volume-planning estimate, not a loading or vehicle-safety certification.
Sources and related work
Pair inventory evidence with mover requirements
- FMCSA: Your Rights and Responsibilities When You Move — inventory, estimates, and shipment records.
- FMCSA: Steps to select a mover — mover and estimate due diligence.