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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.
Throw ratio is volumetric weight divided by actual weight. See whether a shipment is charged on DIM weight.
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Throw ratio (sometimes called the DIM ratio) is volumetric weight divided by actual weight. A ratio above 1 means volumetric weight is higher and the carrier will usually bill on DIM weight. Volumetric weight is typically L×W×H (cm) ÷ a divisor; 5000 is common for express and 6000 for air. Amazon US often uses 139 in³/lb. Confirm with the official carrier or platform rule. This page shares its math with the volumetric-weight and chargeable-weight calculators.
Volumetric weight (kg) = length × width × height (cm) ÷ the divisor. Throw ratio = volumetric weight ÷ actual weight. When the ratio is greater than 1, chargeable weight is usually the volumetric weight, sometimes rounded in 0.5 kg steps.
Volumetric weight is higher than actual weight, so the shipment is usually billed as a volumetric (DIM) shipment. At or below 1, actual weight usually applies.
5000 is common for international express and 6000 for air freight, but the official carrier or platform rule prevails. Amazon US often uses 139 cubic inches per pound.
They share the same formula. This page highlights the ratio; the volumetric page highlights DIM weight itself; the chargeable-weight page highlights the greater-of-the-two figure and rounding.
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