This difference is a commonly forgotten factor when sending parcels through any courier service but holds particular relevance when sending parcels through the Post Office. The Post Office charges its customers by both cubic weight and dead weight (whichever is the greatest) and if you don’t get this right it is highly likely that your consignment will be delayed because it bears insufficient postage.
Luckily however the calculation is very simple even for those of us who have a selective memory of everything that we were taught about math in high school!
Dead weight is exactly as it sounds – it can be measured by placing the item on a scale.
Cubic weight is calculated by using the following formula:
Length Of The Object (m) x Height Of The Object (m) x Width Of The Object (m) x 250
So now for an example if we wanted to send a box that was 20cm x 20cm x 20cm and when we put the item on a scale it weighs 1kg – I don’t know what we would be sending in a box so big that only weighs 1kg but hey this is just an example!
Substituting the values into our formula we are left with:
0.2 x 0.2 x 0.2 x 250 = 2kg
Therefore for this parcel we should be paying for an item that weighs 2kg not 1kg and if we don’t we should be worried about the post office delaying the delivery because of the insufficient postage.
So there you have it, its as simple as that!
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