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No Responses September 1, 2025

How to Calculate CBM and Volumetric Weight for Courier Shipments

Meta Description:
Learn how to calculate CBM (Cubic Meter) and convert it into volumetric weight (kg) for courier shipments. Step-by-step guide with examples for accurate shipping charges.

📦 What is CBM in Shipping?

CBM (Cubic Meter) measures the volume of a package. It tells couriers and freight forwarders how much space your shipment will occupy. CBM is mostly used for sea freight or large cargo shipments.

CBM Formula:
CBM = Length (m) × Width (m) × Height (m)

Example:
A box measuring 2 m × 1 m × 0.5 m →
CBM = 2 × 1 × 0.5 = 1 CBM

⚖️ What is Volumetric Weight?

Volumetric weight (also called dimensional weight) is used by courier companies to charge for large but lightweight packages. Instead of charging by actual weight (kg), the cost is based on the space the package occupies.

🧮 Volumetric Weight Formula

For most international couriers:

Volumetric Weight (kg) = (Length × Width × Height) ÷ 5000

Where:

  • Length, Width, Height = in centimeters (cm)

  • 5000 = standard courier divisor to convert volume into kilograms
    (Some couriers use 4000–6000 depending on the service.)

📝 Step-by-Step Guide to Calculate Volumetric Weight

  1. Measure the Package
    Include packaging and measure Length, Width, Height in cm.

  2. Multiply Dimensions
    Volume (cm³) = Length × Width × Height

  3. Divide by 5000
    Volumetric Weight (kg) = Volume ÷ 5000

  4. Compare with Actual Weight

    • If Actual Weight > Volumetric Weight → chargeable weight = actual weight

    • If Actual Weight < Volumetric Weight → chargeable weight = volumetric weight

📊 Example

Package size: 120 cm × 80 cm × 60 cm

  1. Multiply dimensions: 120 × 80 × 60 = 576,000 cm³

  2. Divide by 5000: 576,000 ÷ 5000 = 115.2 kg → Volumetric Weight

  3. Actual weight = 100 kg → Chargeable Weight = 115.2 kg

✅ The courier will charge based on 115.2 kg, not 100 kg.

✅ Tips for Accurate CBM & Volumetric Weight

  • Always include packaging in measurements.

  • Round off decimals to two places.

  • For irregular-shaped items, approximate dimensions or use packing software.

  • Check with your courier company for the exact volumetric divisor.