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.

How do I calculate dimensional weight?

Dimensional weight formula: (Length × Width × Height) ÷ DIM factor. For air freight, use DIM factor 6000 (cm) or 166 (inches). For sea freight, use 1000 (cm). Example: A 50×40×30cm package = 60,000 ÷ 6000 = 10 kg dimensional weight.

What DIM factor should I use?

DIM factors vary by carrier and shipping method: Air freight typically uses 6000 (cm³/kg) or 166 (in³/lb), FedEx/UPS domestic use 139, sea freight uses 1000. Always confirm with your carrier as factors may vary.

How can I reduce dimensional weight charges?

Reduce dimensional weight by: 1) Using right-sized packaging without excess space, 2) Reducing packaging material thickness, 3) Using vacuum packaging for soft goods, 4) Considering product bundling, 5) Choosing appropriate shipping method based on density.

Dimensional Weight Calculator Guide: DIM Weight Formula Explained

1What is Dimensional Weight?

Dimensional weight (also called DIM weight or volumetric weight) is a pricing method used by carriers that considers both actual weight and the space a package occupies.

Billing Principle

Shipping cost = Actual weight vs Dimensional weight, whichever is greater. This means light but bulky packages may cost more than heavy but compact ones.

2The Formula

// Dimensional Weight Formula

DIM Weight = (L × W × H) ÷ DIM Factor

// Billable Weight

Billable = MAX(Actual Weight, DIM Weight)

Unit Notice

Ensure dimensions and DIM factor use the same unit system. Use 6000 for cm, 166 for inches.

3DIM Factor Reference

Shipping Method/Carrier	DIM Factor (cm)	DIM Factor (in)
International Air	6000	366
FedEx / UPS / DHL	5000	139
Amazon FBA (Standard)	—	139
Amazon FBA (Oversize)	—	166
Sea Freight	1000	—

Pro Tip

Higher DIM factor = lower dimensional weight. Sea freight DIM factor is 6x air freight, making it more economical for bulky, lightweight cargo.

4Calculation Examples

Example: Electronics Package

Package size: 50cm × 40cm × 30cm

Actual weight: 5 kg

Volume: 50 × 40 × 30 = 60,000 cm³
Air DIM weight: 60,000 ÷ 6000 = 10 kg
Sea DIM weight: 60,000 ÷ 1000 = 60 kg

Result: Air freight billable weight is 10 kg (DIM weight > actual). Sea freight billable weight is 60 kg. If actual weight exceeds DIM weight, actual weight is used.

5Optimization Strategies

Right-Size Your Packaging

Avoid oversized boxes. Packaging should just fit the product and necessary protection - no excess void space.

Reduce Packaging Materials

Use thinner but equally protective materials. Bubble wrap saves more space than foam blocks.

Consider Vacuum Packaging

For soft goods like clothing and textiles, vacuum packaging dramatically reduces volume.

Choose the Right Shipping Method

Bulky, lightweight cargo favors sea freight; compact, heavy cargo is better for air freight.

6Use Our Calculator

Our calculator automatically computes both dimensional and actual weight to determine billable weight and estimate shipping costs.

Calculate DIM Weight Now

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