Two things move an international quote more than anything else: how much the box weighs, in real or dimensional terms, and how far it is going. A third lever, which service tier gets picked, trades speed for price on top of those two. What none of it includes is duty or tax — that gets calculated separately, by the destination country, once the box arrives.
In that order, three inputs build almost every international number.
“Dimensional weight is the amount of space a package occupies compared to its actual weight.” Formula: “Dimensional Weight = (L x W x H) ÷ Divisor.”UPS, Shipping Dimensions and Weight, ups.com, read 2026-09-02
UPS states this divisor-based calculation may apply "to all UPS domestic and international package services," with two published divisors depending on rate type. A large, light box — a lampshade, a stack of foam packaging, an empty-looking carton — can end up billed by the volume it occupies on a plane or in a container rather than by what a scale reads, once its dimensional figure comes out higher than its actual weight.
A 14 × 10 × 6 in, 4 lb box — a pair of jeans and a sweater, boxed — quoted from Berkeley Heights, NJ 07922 to each of the four countries SMKlog sells self-service. Each row is the cheapest line item from a carrier this page can name with confidence.
| Destination | Cheapest identified service | Price | Delivery days |
|---|---|---|---|
| Toronto, Canada | UPS Standard | $27.91 | 2 |
| London, United Kingdom | UPS Worldwide Economy DDU | $40.09 | 8 |
| Berlin, Germany | USPS First-Class Package International Service | $61.68 | — |
| Sydney, Australia | UPS Worldwide Economy DDU | $67.72 | 8 |
Same box, same weight, same date — more than double the price between the nearest destination and the farthest. Other carriers were quoted on every lane too and sometimes came close; this table isolates the cheapest service this page can name without guessing at an unlabeled rate.
| Weight | Cheapest identified service | Price |
|---|---|---|
| 4 lb | UPS Expedited | $62.57 |
| 10 lb | UPS Expedited | $89.40 |
Six extra pounds moved the price from $62.57 to $89.40 on the exact same lane and the exact same service. Destination sets the floor a box starts from; weight, whether actual or dimensional, moves it from there.
Neither figure is part of the checkout price for postage. Both are assessed by the destination country once the parcel arrives, against the value and classification declared on the customs form, not against the shipping charge.
The recipient, on the four lanes SMKlog sells self-service, the same way it works through most carrier checkouts by default.
A destination country's own duty rate and any personal-use exemption decide the size of that separate bill; our what to declare guide covers how the value on the form feeds it.
The calculator runs this same weight-then-destination-then-service calculation live against whatever box and route are entered, across the four countries sold self-service today — Canada, the UK, Germany and Australia — and shows the carrier and price it actually returns rather than an estimate built from a table. Every figure on this page came from that same checkout, captured on the date shown, and your own box will return its own number.
Rates change with fuel surcharges, peak-season pricing and account terms; treat the figures above as what these specific boxes cost on this specific date, and requote before relying on a number.
Two inputs decide most of it: the box's actual weight or its dimensional weight, whichever is greater, and the destination country. A third factor, which service tier is picked, adds or removes speed for a price difference on top of those two. Duty and tax are calculated separately by the destination country and are never part of the number a checkout shows for postage.
UPS's own definition: "Dimensional weight is the amount of space a package occupies compared to its actual weight," calculated as length times width times height divided by a divisor UPS states may apply "to all UPS domestic and international package services." A box that is large but light gets charged by its size rather than its scale weight once the dimensional figure comes out higher.
No. A 4 lb box quoted from Berkeley Heights, NJ on 2026-09-02 ran from $27.91 to Toronto up to $67.72 to Sydney on the cheapest identified carrier line for each lane — same box, same date, more than double the price driven entirely by destination.
Yes. The same box to Berlin, sent on UPS Expedited both times to hold the service constant, ran $62.57 at 4 lb and $89.40 at 10 lb, a jump that shows up on a single lane without changing the destination at all.
No. Duty and tax are assessed by the destination country once the shipment arrives there and are billed to the recipient separately from the checkout price for postage.