How to Split Freight Costs Across Multiple Products (With Example)
Learn how to allocate freight cost by weight, value, or volume so each SKU has a more accurate landed cost.
How to Split Freight Costs Across Multiple Products (With Example)
When one shipment contains several products, freight cannot always be divided evenly. A heavy SKU may consume more freight than a light accessory. A bulky product may occupy more carton or container space. A high-value item may carry more insurance or duty impact.
Splitting freight correctly helps you calculate the real landed cost of each product. Without it, you may price some SKUs too low and others too high.
Why You Need to Split Freight Per SKU
Freight is often charged for the shipment as a whole. You might receive one invoice for ocean freight, air freight, courier shipping, or local delivery. But you sell products individually, so each SKU needs its fair share of that shipping cost.
If you ignore freight allocation, your margin report can be wrong. A small item can appear less profitable than it really is, while a heavy product can look profitable until shipping costs are included.
Freight splitting is especially important for importers, ecommerce sellers, and wholesalers who buy mixed cartons or containers.
It also improves reorder decisions. If one product only works because another product is absorbing too much of the shared freight, the next shipment can expose the mistake. A clear allocation method lets you compare products shipment after shipment.
3 Methods: By Weight, By Value, By Volume
There are three common ways to split freight.
By weight: allocate shipping cost based on each product's share of total shipment weight. This works well when freight is driven by kilograms or pounds.
By value: allocate cost based on each product's share of total product value. This can make sense for insurance, duty-like charges, or shipments where value matters more than physical size.
By volume: allocate cost based on carton space or cubic volume. This works well when bulky products take more container space even if they are not heavy.
The Freight Split Calculator lets you test allocation methods without rebuilding formulas manually.
Which Method Should You Use?
Use weight when freight is charged by actual or billable weight. Air freight and parcel shipping often make weight a practical choice.
Use volume when products vary heavily in size. A large but light product may take more space than a compact heavy product. If container space is the constraint, volume can be fairer.
Use value when allocating costs connected to declared value, insurance, or high-value handling. For a general landed cost estimate, some teams use value because it is easy to explain and audit.
The key is consistency. Pick a method that matches the cost driver and keep notes so the allocation can be reviewed later.
Step-by-Step Example with 3 Products
Assume total freight is $600 for three products:
- Product A: 100 units, total weight 60 kg
- Product B: 50 units, total weight 30 kg
- Product C: 200 units, total weight 10 kg
Total shipment weight is 100 kg. Product A gets 60% of freight, Product B gets 30%, and Product C gets 10%.
Product A freight share is $360. If it has 100 units, freight per unit is $3.60. Product B freight share is $180, or $3.60 per unit. Product C freight share is $60, or $0.30 per unit.
An equal split by units would allocate $1.71 per unit to every product, which would understate freight on Product A and overstate freight on Product C.
How Incorrect Freight Allocation Destroys Your Margin
Wrong freight allocation changes pricing decisions. If the heavy product does not receive enough freight cost, you may sell it at a price that looks profitable but is not. If the light product receives too much freight, you may price it too high and lose sales.
It also affects supplier comparison. A supplier with lower unit price but poor carton efficiency may cost more after shipping. Use the Supplier Comparison Matrix after allocating freight so your comparison uses realistic numbers.
Allocation also matters for discounts. If you run a promotion, you need to know whether the discounted selling price still covers each SKU's real landed cost. The cheapest item in the shipment may not be the safest item to discount.
Free Freight Split Calculator (CTA)
Use the Freight Split Calculator to allocate shipping cost by weight, value, or volume. Then check final selling price with the Profit Margin Calculator.