Work out what your courier will actually bill you for a parcel — before the invoice arrives.
Runs entirely in your browser. Nothing you enter is sent anywhere or stored.
Every consignment has two weights, and your courier bills the higher one.
The actual weight is what the parcel registers on the scale at the courier's hub — not the figure entered on your booking slip. The two often differ, and nothing notifies you when they do.
The volumetric weight converts the space the parcel occupies into a weight figure: length times width times height, divided by a divisor written into your contract. It exists because a van fills up by volume long before it fills up by mass.
Whichever is higher is your chargeable weight. That is the figure that meets your rate card.
This is why a large box of something light — cushions, packaging, garments — can cost the same to ship as something several times heavier in a smaller box. The parcel is being billed for the room it takes up.
Chargeable weight is not billed continuously. It is placed into a slab.
A base slab covers everything up to a first threshold. Above that, weight is charged in fixed increments, and any part of an increment is charged as a whole one. A consignment fractionally over a threshold is billed as though it sat at the top of the next band.
The calculator shows both the raw chargeable weight and the slab it rounds into, because the gap between them is where a surprising amount of monthly freight cost lives.
Your packaging is the lever, not your rate. Reducing box dimensions changes the billed figure directly, and it is usually faster than renegotiating a card.
Look at what pushed you there. Void fill, an oversized outer box or a heavy insert can move a consignment into the next slab for no benefit to anyone.
You have the beginning of a weight dispute. You will need your packed dimensions, the divisor from your contract, and the consignment number — and you will need to raise it inside the claim window in your agreement, which typically runs from the invoice date rather than from when you noticed.
It is in your signed rate card, not in the headline rate you were quoted. If you cannot find the document, ask your account manager for the slab table including the volumetric divisor and the treatment of fuel and GST. Those three things together are what makes an invoice checkable.
Divisors differ between couriers and between contracts, which is why this calculator asks for yours rather than assuming one.
A weight figure derived from a parcel's dimensions rather than its mass — length times width times height, divided by a divisor set in your courier contract. It exists because vehicles run out of space before they run out of payload.
The higher of actual and volumetric, then rounded up into the nearest slab above it.
The one in your own rate card. Divisors vary between couriers and between contracts, so there is no single correct value to assume.
Yes — the volumetric formula is the same across couriers. What differs is the divisor and the slab structure, which is why both are inputs rather than fixed values.
No. The calculation runs entirely in your browser and nothing is sent to a server.