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First-leg freight calculator
Estimate first-leg freight from chargeable kg or CBM and a unit rate from your official quote.
Chargeable weight is the greater of actual and volumetric weight, with optional 0.5 kg rounding.
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Fill in the numbers and press Calculate, or load the example first.
International express and air freight are usually billed on chargeable weight: the greater of actual and volumetric weight, sometimes rounded up in 0.5 kg steps. Volumetric weight is L×W×H (cm) ÷ a divisor; 5000 is common for express and 6000 for air. Confirm with the official carrier rule. This page shares its formula with the volumetric-weight and throw-ratio calculators.
Volumetric weight = L × W × H (cm) ÷ the divisor. Raw chargeable weight = max(actual, volumetric). If a step such as 0.5 kg is entered, rounded chargeable weight is rounded up to that step. Multiply by the number of pieces for a total.
40×30×20 cm with a 5000 divisor is 4.8 kg, which is greater than the 3.2 kg actual weight. Rounded up in 0.5 kg steps it becomes 5.000 kg.
Yes. Leave the step blank and the page shows the unrounded greater value. Whether rounding applies follows the official carrier rule.
Choose the Amazon US 139 in³/lb preset and switch units to inches and pounds. That divisor follows the published US rule; for other marketplaces enter the official custom divisor.
Report formula, copy, or fee-rule issues. Do not send your prices or costs.
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