Container Load Calculator
Estimate how many pallets fit on the container floor for 20ft, 40ft, and 40HC containers. This is a fast, conservative estimator that rounds down and explains the assumptions.
Inputs
Results
What this calculator is
The Packlyt Container Load Calculator estimates how many pallets can fit on the floor of common ISO shipping containers (20ft, 40ft, and 40HC). It’s designed for B2B planning workflows where you need a quick, transparent estimate for capacity, quoting, or routing decisions.
This estimator focuses on floor layout only. It does not model stacking, payload weight limits, pallet overhang, or handling constraints beyond simple clearances and gaps.
How it works (plain language + formulas)
We treat the container floor as a rectangle and “tile” it with pallets using a simple grid. We apply your wall clearance to reduce the usable space, then place pallets with an optional gap between pallets. If rotation is enabled, we try both orientations and pick the one with more pallets.
Key formulas
Units are inches. “Gap” is only between pallets (not required at the walls), which is why we add one gap back to the numerator.
Usable dimensions
usableLen = containerLen − 2×clearance
usableWid = containerWid − 2×clearance
Pitch (pallet size plus gap between adjacent pallets)
pitchLen = palletLen + gap
pitchWid = palletWid + gap
Count along each axis
nLen = floor((usableLen + gap) / pitchLen)
nWid = floor((usableWid + gap) / pitchWid)
total = nLen × nWid
Input definitions
- Container type: Selects internal floor dimensions for 20ft, 40ft, or 40HC.
- Pallet length / width (in): Your pallet footprint. (Common US pallet: 48 × 40 in.)
- Wall clearance (in): A safety buffer from container walls on all sides (length and width).
- Gap between pallets (in): Spacing between adjacent pallets for handling tolerance, dunnage, or airflow.
- Allow rotation: If enabled, we evaluate both pallet orientations (length-wise vs width-wise).
Output definitions
- Estimated pallets on floor: The maximum pallets that fit in a simple grid layout, rounded down.
- Selected orientation: Which pallet side is aligned with container length/width for the best fit.
- Container internal floor used: The exact internal dimensions used by this calculator (shown in inches).
- Usable floor after clearance: Internal dimensions minus wall clearance on both sides.
- Pallet grid (L × W): Count along container length × count along container width, plus leftover space.
Common B2B use cases
- Quoting and planning: Estimate containers required for a shipment based on pallet counts.
- Lane selection: Compare 20ft vs 40ft when optimizing cost per pallet.
- Operations handoff: Share a link with exact assumptions (clearance/gap/rotation) for alignment.
- Packaging + palletization decisions: Evaluate how pallet footprint changes container utilization.
Limitations and assumptions
- Conservative floor-fit: Uses a simple rectangular grid, no advanced packing, staggering, or interlocking patterns.
- Rounding down: Always rounds down to avoid overestimating capacity.
- Floor only: Does not model stacking, height, weight limits, axle/payload constraints, or center-of-gravity rules.
- Interior dimensions vary: Container manufacturers and fleets can differ. Use the displayed dimensions as the estimator’s baseline.
- No pallet overhang: Assumes pallet footprint must fit within usable floor (after clearance).
For methodology details and dimensional sources, see Methodology.
Disclaimer
This tool provides planning estimates only. Actual loadability depends on pallet type, overhang allowances, product stability, handling equipment, container condition, dunnage, blocking/bracing, and carrier requirements. Always verify with your operations team or logistics provider before execution.
Related calculators
Keep your workflow consistent: every calculator links back to the category hub and Methodology.
FAQ
Does 40HC fit more pallets than a standard 40ft?
On the floor, typically no—40ft and 40HC usually share the same internal length and width. 40HC is taller, so it may support more product volume if your load can be stacked safely.
Why do you add “+ gap” in the formula?
Gaps occur between pallets. For N pallets in a row, there are N−1 gaps. Using (usable + gap) / (pallet + gap) is a standard way to count items with internal spacing without requiring a wall gap.
What’s a good wall clearance to use?
Many teams start with 1–2 inches for a conservative buffer, but the right value depends on pallet quality, loading method, and dunnage/liner requirements.
Can this handle mixed pallet sizes?
This version assumes one pallet size per estimate. For mixed footprints, you’ll typically plan in patterns or simulate layouts separately.