Air Freight Weight Calculator
Calculate chargeable weight for air freight shipments
How to Use This Tool
Start by selecting your unit system (Metric for cm/kg or Imperial for in/lb). Enter the actual weight of your shipment and the three dimensions of your package. Choose the divisor your carrier uses—common values are 6000 for standard metric and 166 for standard imperial, but always verify with your carrier. Click Calculate to see both volumetric and chargeable weights. Use the Copy button to copy the chargeable weight for invoices or shipping labels.
Formula and Logic
Volumetric Weight = (Length × Width × Height) ÷ Divisor
The divisor converts cubic volume into weight units. Carriers set these based on their density thresholds.
Chargeable Weight = MAX(Actual Weight, Volumetric Weight)
Air freight charges are always based on the higher of these two values.
Practical Notes
In business operations, understanding chargeable weight directly impacts your shipping margins. E-commerce sellers should factor this into product listings—items with high volumetric weight (like large, lightweight products) eat into profits. Negotiate carrier contracts based on your typical chargeable weight, not just actual weight. For international trade, Incoterms like EXW or FCA affect who pays freight, but the chargeable weight calculation remains the same. Always measure the outermost dimensions including packaging. Some carriers have minimum chargeable weights per shipment—factor this into your pricing strategy. For high-value or time-sensitive shipments, express services often use lower divisors (like 4000), making volumetric weight more impactful.
Why This Tool Is Useful
This calculator prevents billing surprises by accurately determining what you'll actually pay for air freight. It helps businesses optimize packaging—reducing dimensions even by a few centimeters can lower volumetric weight and save significant costs on high-volume shipments. Sales teams can provide accurate shipping quotes to customers, improving trust and conversion rates. Operations managers use it to evaluate packaging redesigns and carrier selection. For startups and small businesses, it's essential for unit economics calculations when setting product prices.
Frequently Asked Questions
Why does my volumetric weight exceed actual weight?
This happens when your package is large but lightweight (e.g., a box of foam). Carriers charge for space as well as weight, so they use volumetric weight to ensure fair compensation for the aircraft's cargo space. Redesign packaging to be more compact or use denser materials.
What divisor should I use?
Check your carrier's contract or rate sheet. Standard divisors are 6000 (cm) and 166 (in) for regular freight. Express services often use 4000 or 5000. Some carriers have different divisors for different routes or service levels. When in doubt, use 6000 for a conservative estimate.
Can I negotiate the divisor?
Generally no—divisors are set by carriers based on aircraft capacity and fuel costs. However, high-volume shippers can negotiate overall freight rates that effectively reduce the impact of volumetric weight. Focus on packaging optimization and carrier selection instead.
Additional Guidance
Always measure packages after packaging is complete—including any void fill, boxes, and outer wrapping. For irregular items, use the smallest rectangular prism that can contain the item. Remember that dimensional weight calculations can vary slightly between carriers; some use rounding rules (e.g., rounding up to the next 0.5kg). For cross-border e-commerce, factor in customs duties based on declared value, not weight. Keep records of your volumetric weight calculations for audit purposes. If shipping multiple items in one shipment, calculate total volumetric weight for the entire consolidated package, not individual items.