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Mageplaza Advanced B2B Shipping

How to set shipping rate rules (DIM factor, fallback dimensions, surcharges)

These are global settings that affect the entire shipping system.

A. Set the DIM Factor

DIM Factor = the number used to calculate Dimensional Weight.

Formula: DW = (Length × Width × Height) / DIM

Steps

  1. Go to Settings → Shipping rate calculator
  2. Enter a number (e.g., 6000)
  3. Save
  4. If you already have carrier methods, choose whether to apply this new DIM globally

For example:

  • Box size: 40 x 30 x 30 cm
  • DW = 40 x 30 x 30 ÷ 6000 = 6kg
  • If the actual weight is 3kg → the carrier charges 6kg, not 3kg.

B. Set fallback dimensions

Fallback dimensions are used only when a product has no size/weight data.

Steps

  1. Go to Settings → Shipping rate calculator
  2. Turn ON Fallback dimensions
  3. Enter default Length, Width, Height, Weight
  4. Click Save

If a new product hasn’t been updated with size info:

  • → The app will use the fallback size (e.g., 20 × 20 × 10 cm)
  • → Shipping fee will still calculate correctly, avoiding errors at checkout.

C. Create and manage surcharge types

Surcharges help you add extra fees like:

  • Fuel charge
  • Oversize fee
  • Residential delivery fee

Steps

  1. Go to Settings → Shipping rate calculator
  2. Scroll to Surcharge settings
  3. Click Add surcharge
  4. Name the surcharge (e.g., “Fuel Fee”)
  5. Enter an amount
  6. Save

These surcharges can now be added to any Carrier Method.