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Enter your parcel's weight and box dimensions, then choose the destination zone and delivery speed. The calculator works out the dimensional weight, takes the greater of actual and dimensional weight as the billable weight, and applies zone-based base fees and per-kilogram rates with a speed multiplier. The figures shown are estimates for planning and budgeting, not live carrier quotes; always confirm the final price with your carrier before booking.
Carriers charge for whichever is greater: what your parcel weighs on a scale, or the space it takes up in a van or aircraft. The space-based figure is called dimensional (or volumetric) weight. With dimensions in centimetres, the industry standard is: dimensional weight in kg = (length × width × height) / 5000. The divisor 5000 is the standard used by major international couriers for parcel freight; air freight often uses 6000 and US carriers use 139 when measuring in inches and pounds. Worked example: a 60 × 40 × 40 cm box that weighs 5 kg on a scale has a dimensional weight of (60 × 40 × 40) / 5000 = 19.2 kg. Because 19.2 is greater than 5, the carrier bills 19.2 kg. Light, bulky parcels are priced on the box, not the scale.
Weigh your parcel, or estimate it if it is not packed yet. Measure the outside of the packed box: the longest side is the length, then the width and the height, all in centimetres, including any protective packaging. Choose the destination zone: local for same-city deliveries, regional for nearby areas, national for domestic, and international for cross-border. Pick a delivery speed. The calculator shows the estimated cost and the billable weight side by side, so you can see whether size or weight is driving your price. If dimensional weight wins, a smaller box may cut the cost.
The divisor converts box volume into a billable weight, and a smaller divisor produces a larger billable weight for the same box. Parcel and express couriers (DHL, UPS, FedEx, most regional couriers) standardise on 5000 when dimensions are in centimetres. Air freight and some economy air services use 6000. The imperial equivalent used in the United States is 139 when dimensions are in inches and the result is in pounds. A 50 × 40 × 30 cm box illustrates the difference: at a divisor of 5000 it bills 12 kg, at 6000 it bills 10 kg. Always check your carrier's tariff for the divisor on your service before quoting a customer.
Four factors decide most of the price. Distance, grouped into zones, sets the base fee and per-kilogram rate: international lanes cost several times a local drop. Billable weight, the greater of actual and dimensional weight, scales the per-kilogram charge. Delivery speed multiplies the total, with express roughly 1.6 times standard and priority roughly 2.4 times in this estimator, which mirrors how carriers price urgency. Finally, surcharges stack on top: fuel surcharges that change with oil prices, residential or remote-area delivery fees, additional handling for oversized parcels, and duties and customs clearance fees on international shipments. If you regularly ship with one courier, keep its rate card handy so you can calculate its charges precisely before comparing with rival carriers.
Use the smallest box that fits the product safely; shrinking one side of a 60 × 40 × 40 cm box can drop the dimensional weight by a quarter. Replace bulky void fill with tighter packing and prefer flat mailers for thin items. Compare carriers rather than defaulting to the same one, because rate cards and divisors differ. Ship slower when time allows: standard service can cost less than half of priority. Consolidate multiple orders into one parcel where possible, and for international shipments keep declared values accurate so customs clearance does not add delays and fees. For ecommerce sellers, how much you pay often comes down to how much you can reduce the box size, and postage alone rarely tells the whole story.
Dimensional weight, also called volumetric or DIM weight, is a theoretical weight calculated from a parcel's volume rather than its scale weight. Carriers use it because a large, light box occupies the same cargo space as a heavy, compact one. The formula with centimetres is (length × width × height) / 5000, giving the result in kilograms.
Carriers start with the billable weight, the greater of the actual scale weight and the dimensional weight. They then apply their rate for the destination zone and the chosen service speed, and add any surcharges such as fuel, residential delivery, or customs fees. Our calculator follows the same steps with transparent, illustrative rates.
You pay for the greater of the two: the actual weight on a scale, or the dimensional weight from the box volume. A 2 kg pillow in a large box can bill at 14 kg or more, while a dense 25 kg package bills at 25 kg because the scale weight wins.
Both convert box volume into kilograms; a smaller divisor yields a larger billable weight for the same box. Most international parcel couriers use 5000, while air freight and some economy services use 6000. The imperial equivalent is 139 when dimensions are in inches and the result is in pounds. Check your carrier's rate card for the divisor that applies to your service.
Choose the slowest service you can tolerate, use the smallest box that fits the item safely, and compare at least two carriers. National postal services are often cheapest for light domestic parcels, while flat-rate boxes can be a good deal for heavy, compact items. Consolidating several orders into one parcel also cuts the per-order cost.
No. The estimate covers the carrier charge based on weight, dimensions, zone and speed. Shipping insurance (often priced on declared value) and international customs duties and taxes are not included, so add them separately when budgeting.
It is a planning estimate, not a carrier quote. Real carrier pricing adds fuel surcharges, remote-area fees, rounding rules, negotiated discounts, and peak-season adjustments. The result should be close enough for budgeting and comparison, but always confirm the final price with the carrier before you book.
Speed multiplies the whole charge. Express services cost significantly more than standard, and priority or overnight the most of all. In this estimator, express is 1.6 times the standard price and priority is 2.4 times, which mirrors the typical spread on published carrier rate cards.