DimPack3D is a free online 3D packaging calculator designed for e-commerce sellers, Amazon FBA sellers, and freight forwarders. It helps you calculate optimal product-to-carton packing, container loading, CBM (cubic meters), and Amazon FBA size tiers with interactive 3D visualization.

How do I calculate CBM (Cubic Meters)?

To calculate CBM, enter your carton dimensions (length, width, height) in centimeters. DimPack3D automatically converts to cubic meters using the formula: CBM = (Length × Width × Height) / 1,000,000. The calculator also shows total CBM for multiple cartons in your shipment.

What are Amazon FBA size tiers?

Amazon FBA size tiers determine fulfillment fees based on product dimensions and weight. Tiers include Small Standard, Large Standard, Large Bulky, and Extra-Large. DimPack3D uses the 2025 Amazon FBA standards to classify your products and estimate fees.

How many boxes can fit in a 40-foot container?

The number of boxes depends on your carton dimensions. A 40GP container has internal dimensions of approximately 1203 × 235 × 239 cm (67.5 CBM). DimPack3D's container loading calculator optimizes placement and shows exactly how many cartons fit with 3D visualization.

Is DimPack3D free to use?

Yes, DimPack3D is completely free with no registration required. All features including 3D visualization, packing calculator, container loading, and FBA size tier calculations are available at no cost. Your data is saved locally in your browser.

What is dimensional weight and how is it calculated?

Dimensional weight (DIM weight) is a pricing technique for freight that considers package size. It's calculated by multiplying Length × Width × Height and dividing by a DIM factor (typically 5000 for air freight, 6000 for sea freight). Carriers charge the greater of actual weight or dimensional weight.

What is a good container utilization rate?

A good container utilization rate is 80-90%. While 100% might seem ideal, leaving 10-15% space allows for easier loading/unloading and reduces cargo damage risk. Professional loaders typically target 85% as the sweet spot.

How do I calculate container loading efficiency?

Container loading efficiency = (Total cargo CBM ÷ Container capacity CBM) × 100%. For example, 25 CBM cargo in a 33 CBM 20GP container = 75.8% utilization. Consider both volume and weight limits.

What is the best stacking pattern for containers?

The best stacking pattern depends on carton dimensions. Common patterns include: Block stacking (same-size cartons), Brick pattern (offset layers for stability), and Column stacking (heavy items on bottom). Always place heavier cartons at the bottom and near the container doors.

How do I prevent cargo damage during shipping?

Prevent cargo damage by: 1) Distributing weight evenly, 2) Using dunnage and void fillers, 3) Securing cargo with straps or nets, 4) Not exceeding stacking limits, 5) Leaving ventilation gaps if needed, 6) Using moisture absorbers for long voyages.

Container Loading Optimization: Maximize Space Utilization

1Container Specifications

Type	Internal Dims	Capacity	Max Load
20GP	5.9m × 2.35m × 2.39m	33.2 CBM	28,000 kg
40GP	12.03m × 2.35m × 2.39m	67.7 CBM	26,000 kg
40HQ	12.03m × 2.35m × 2.69m	76.3 CBM	26,000 kg

Container Selection Tip

40HQ is 30cm taller than 40GP, providing ~9 CBM extra space. If cargo height exceeds 2.2m or you need extra room, 40HQ is usually the better choice.

2Loading Patterns

Block Stacking

Best for uniform carton sizes. Stack directly layer by layer to maximize vertical space.

85-90% utilization possible

Brick Pattern

Offset each layer for increased stability. Ideal for long-distance or sea shipping.

Best stability

// Optimal Loading Order

1. Heavy items → Bottom, near doors

2. Medium weight → Middle layers

3. Light items → Top, load last

3Weight Distribution

Proper weight distribution is critical for safe transportation. Unbalanced loads can cause container tilting, cargo damage, or accidents.

Critical Rules

• Center of gravity should be at container center
• Front-to-back weight ratio should not exceed 60:40
• Left and right sides should be balanced

4Optimization Strategies

1Standardize Carton Sizes

Use 2-3 standard carton sizes for easier loading planning and reduced gaps.

2Calculate Before Loading

Use a loading calculator to plan ahead, avoiding time-wasting adjustments on-site.

3Use Void Fillers

Use air bags, foam, or cardboard to fill gaps and prevent cargo movement during transit.

4Target 85% Utilization

85% is the ideal balance - maximizing space while leaving room for safe handling.

5Common Mistakes

✗Exceeding carton stacking limits
✗Placing heavy items on top
✗Ignoring container weight limits
✗Not securing cargo properly
✗Sacrificing safety for 100% utilization

6Use Our Calculator

Use our free container loading calculator. Enter carton dimensions to automatically calculate optimal loading plans and space utilization.

Try Container Calculator Now

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