3D Printing Shipping Cost Formula
Learn how a 3D printed order's estimated shipping cost is calculated from packed weight, parcel dimensions, carrier rates and fees.
This formula estimates the delivery charge for a packed 3D print. It matters because light but bulky prints can be billed using dimensional weight rather than the weight measured on a scale.
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Estimated Shipping Cost
Where:
Calculate the parcel's dimensional weight, compare it with the packed weight, and use the larger figure as the billable weight. Multiply that weight by the carrier rate, then add fixed and handling charges.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| packedWeight - Packed weight | Weight of the sealed shipment, including the 3D print, box, padding, tape, inserts and labels. | kg |
| packageLength - Package length | External length of the finished parcel. | cm |
| packageWidth - Package width | External width of the finished parcel. | cm |
| packageHeight - Package height | External height of the finished parcel. | cm |
| dimensionalDivisor - Dimensional weight divisor | Carrier-specified volume per kilogram used to convert parcel volume into dimensional weight. | cm³ per kg |
| shippingRate - Carrier rate | Variable carrier charge for each billable kilogram. | currency |
| baseCharge - Base shipping charge | Fixed carrier, booking or shipment service charge. | currency |
| handlingFee - Packing and handling fee | Charge added for packing materials, labour or order processing. | currency |
Step-by-Step Calculation
Measure the finished parcel
Use the outside dimensions of the box after the print and protective material have been packed.
packageLength * packageWidth * packageHeight
Calculate package volume
Multiplying external length, width and height gives parcel volume in cubic centimetres.
packageVolume = packageLength * packageWidth * packageHeight
Find dimensional weight
Divide parcel volume by the dimensional divisor published for the selected carrier service.
dimensionalWeight = packageVolume / dimensionalDivisor
Select the chargeable weight
The calculation uses whichever is greater: the actual sealed-parcel weight or its size-based dimensional weight.
chargeableWeight = max(packedWeight, dimensionalWeight)
Calculate the variable weight charge
Multiply the billable weight by the carrier's entered rate per kilogram.
weightCharge = chargeableWeight * shippingRate
Add fixed charges
Add the base shipping charge and packing or handling fee to the variable weight charge.
estimatedShippingCost = baseCharge + handlingFee + weightCharge
Example: Shipping a protected PLA print
Calculate volume
25 × 20 × 15
7,500 cm³
Calculate dimensional weight
7,500 ÷ 5,000
1.50 kg
Choose chargeable weight
max(0.50, 1.50)
1.50 kg
Calculate weight-based charge
1.50 × 12.00
18.00
Add fixed charges
18.00 + 4.00 + 2.00
24.00
Final Result
Estimated shipping cost: 24.00. The carrier billing weight is 1.50 kg, even though the sealed parcel weighs 0.50 kg.
Assumptions
- ✓The carrier charges using the greater of actual packed weight and dimensional weight.
- ✓The entered rate applies evenly to every billable kilogram without rate tiers, minimum charges or rounding increments.
- ✓The dimensional divisor is appropriate for the chosen carrier and service.
- ✓The base charge and handling fee represent all fixed charges the user intends to include.
Limitations
- !Actual carrier quotes may use weight rounding, zone pricing, rate bands or parcel-size limits not reflected in this estimate.
- !Fuel, remote-area, peak-period, residential, signature and oversize surcharges may change the final cost.
- !Taxes, customs duties, brokerage charges and import fees are excluded unless included manually in an entered charge.
- !Measurements or weight taken before final packing can produce a lower estimate than the dispatched parcel.
Common Mistakes to Avoid
Entering the print's weight instead of the total sealed parcel weight.
Measuring the item rather than the outside of the final shipping box.
Using a dimensional divisor from a different carrier or service.
Forgetting that a large box can create a higher dimensional weight than the scale weight.
Treating the estimate as a final carrier quote without checking rounding rules and surcharges.
Related Formulas
Frequently Asked Questions
How do I calculate shipping for a 3D printed item?
Measure and weigh the fully packed parcel, calculate dimensional weight from its external dimensions, use the higher weight, multiply it by the carrier rate, and add fixed and handling charges.
What is the formula for dimensional weight in centimetres?
Dimensional weight equals package length multiplied by width and height, divided by the carrier's dimensional divisor: (L × W × H) ÷ divisor.
Why does a lightweight 3D print have a high shipping estimate?
A fragile or irregular print may require a large box and padding. If its dimensional weight is greater than its packed weight, the size of the parcel drives the estimate.
Does the shipping formula round chargeable weight?
This formula uses the precise calculated chargeable weight. Individual carriers may round weight up to a stated increment, which can increase the final quote.
Should packaging materials be included in packed weight?
Yes. Include the print, protective material, box, tape, inserts, labels and any other items shipped in the parcel.
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