Frequently Asked Questions About Canada Post Rates
How does Canada Post work out a parcel price?
In three steps, which Canada Post publishes itself. First, find the rate code for your parcel's origin and destination pair in the Canada rate code look-up table. Second, cross-reference the parcel's weight, or its volumetric equivalent if that is greater, against the price sheet for the service you want. Third, add the price of any options you need. Geography enters the price through the rate code rather than as a separate surcharge. Get an instant quote to skip all three steps.
What is the volumetric equivalent of actual weight?
It is Canada Post's term for dimensional weight, and it is charged whenever it exceeds the parcel's actual weight. Multiply length by width by height to get the cube, then divide by a density factor: 5,000 in cubic centimetres (139 in cubic inches) for Priority, Xpresspost, Expedited Parcel and all US and international services, or 6,000 (166 in cubic inches) for Regular Parcel. Canada Post is explicit that this is not a unit of measure, it is a pricing tool reflecting the space a parcel occupies in a truck or aircraft.
Why does Regular Parcel use a different density factor?
Canada Post applies 6,000 to Regular Parcel and 5,000 to everything else. Because you divide by the factor, a higher number produces a lower billable figure, so Regular Parcel is treated more generously on dimensions than the premium tiers. If you assumed the more expensive service would be the more forgiving one, it is the other way round. For a large but light parcel that difference can outweigh the gap in base rates.
Can I combine the weight of several parcels to get a better rate?
No. Canada Post states that its prices apply to each individual item separately and that weights of multiple pieces cannot be combined. That differs from carriers that rate a multi-piece shipment as a single consignment, so if you are sending several boxes at once it is worth pricing it both ways before you book.
How much will the fuel surcharge add to my Canada Post rate?
It changes every week, so there is no fixed figure to add. Canada Post adjusts fuel surcharges weekly and the domestic, US/international parcel, and packet rates all differ. The practical answer for pricing a shipment is not to add it by hand: quote the parcel and the applicable surcharge is already inside the rate. Our Canada Post Surcharges guide explains how the rate is set.
What size or weight makes a parcel cost more?
Three thresholds matter. Past 22.7 kg (50 lb) a parcel needs an Overweight Parcel sticker. A parcel counts as oversized, and picks up an additional handling surcharge, once any dimension exceeds 1 m or the second-longest side exceeds 76 cm. Past the hard ceilings, meaning any dimension over 2 m, length plus girth over 3 m, or weight over 30 kg, it is out of spec and carries a far steeper surcharge. Our Canada Post Surcharges guide lists what each one costs.
Are the prices in Canada Post's price sheets what I would pay?
Those are Canada Post's published commercial prices, which are list prices, and they change: the current commercial and small-business price sheets were both updated in September 2026. Options, the weekly fuel surcharge and any size penalties are added on top. For what a specific parcel actually costs, use Canada Post's Find a Rate tool, or compare live rates on Secureship to see Canada Post next to every other major carrier at group pricing.







