Shipping Cost Estimator
Estimate shipping costs including dimensional weight
Carrier rate (enter your actual negotiated/published rate)
Dimensional weight (box size)
139 is common for domestic US, 5000 for metric; carriers vary, so check yours
Dimensional weight
3.11 lb
Billable weight (greater of actual vs. dim, rounded up)
4 lb
Your total shipping cost
$8.50
Suggested charge to customer
$8.50
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About Shipping Cost Estimator
Estimates shipping costs including dimensional weight — the box-size-based charge that catches many sellers off guard, since carriers charge based on whichever is greater: actual weight or dimensional weight. Works in pounds/inches or kilograms/centimetres.
Enter your carrier rate, package weight and dimensions. The billable weight is rounded up to the next whole pound or kilo (as carriers do), and the total shipping cost and a suggested customer charge are calculated.
A large, lightweight box can cost more to ship than a small, heavy one because of dimensional weight — using appropriately-sized packaging is a real, ongoing cost lever for anyone shipping regularly. Check your carrier's divisor: 139 (in³/lb) is common in the US, 5000 (cm³/kg) elsewhere.
Watch: Shipping Cost Estimator in Action
- Why did my shipping cost more than expected for a light package?
- A large, lightweight box can cost more to ship than a small, heavy one because of dimensional weight — carriers charge based on whichever is greater, actual weight or dimensional (box-size-based) weight.
- What is dimensional weight and how is it calculated?
- Dimensional weight is a size-based weight that carriers compare with the actual weight, and they bill whichever is greater. It is length times width times height divided by a divisor. In pounds and inches the common divisor is 139, and in kilograms and centimetres it is 5000. The estimator shows both weights and the one that is billed.
- Which dimensional weight divisor should I use?
- Use the divisor in your carrier's rate guide. The tool starts with 139 for pounds and inches and 5000 for kilograms and centimetres, and you can change it, because carriers and service levels differ.
- Does the estimate include fuel, residential or insurance charges?
- No. It calculates from the weight, the dimensions and the rate you enter, so surcharges and insurance your carrier adds are not included. Use it to compare box sizes, then confirm the final price with your carrier.
- How do I lower shipping cost on a light but bulky package?
- Try a smaller box. Because the billable weight is the greater of actual and dimensional weight, a box with empty space can cost more than a smaller one holding the same item. Enter two box sizes and compare the totals.
How to use Shipping Cost Estimator
A shipping cost estimator works out what a parcel will cost to send once the carrier's size-based charge is included. Carriers bill the greater of the package's actual weight and its dimensional weight, which is length times width times height divided by a divisor. Online sellers and small shops use it to test box sizes before they print labels. Enter the weight, the dimensions and your carrier's rate, and it shows the billable weight and the total. Profit Margin Calculator shows what that shipping cost does to your margin.
Enter your shipping carrier's rate structure, your package's actual weight, and its dimensions (length, width, height). The tool calculates dimensional weight — a standard industry formula that carriers use to charge based on how much space a package takes up in a truck or plane, not just how heavy it is — and compares it against the actual weight you entered. Whichever is greater between actual and dimensional weight is what carriers bill against, and that's the number the tool uses for the final cost estimate, matching how real carrier billing works.
When to use it
Useful before finalizing packaging for a shipment, particularly for anyone selling physical products online who ships regularly — checking whether a larger box is going to trigger a dimensional-weight charge before you commit to that packaging, rather than being surprised by the actual invoiced cost after the fact. It's also useful for comparing packaging options for the same item (a slightly smaller, more snugly-fitted box versus a larger one with more padding) to see the real cost difference dimensional weight creates between the two options.
When not to use it
This estimates cost based on the dimensional-weight formula and a rate you provide — it doesn't look up real-time, carrier-specific rates for your account or account for extra fees like residential delivery surcharges, fuel surcharges, or insurance, which can meaningfully affect the final actual invoiced cost. For a precise, final shipping quote, your carrier's own account-specific rate calculator or shipping software will reflect your actual negotiated rates and applicable surcharges more accurately than this general estimator.
Tips for best results
If you ship the same type of item repeatedly, it's worth testing a couple of different box sizes through this calculator once to find the size that minimizes dimensional-weight charges for that specific item — a box just barely larger than the product, rather than a generic one-size-fits-all box with extra void space, is one of the most direct ways to reduce shipping cost on lightweight-but-bulky items specifically.
Limitations
The dimensional-weight formula and divisor used follow common industry standards, but different carriers occasionally use slightly different divisors or rounding rules for their own billing — for the most accurate estimate specific to your carrier, confirm the exact divisor your carrier uses if precision matters for your decision.
Privacy
All calculation happens directly in your browser from the numbers you enter — no shipment details, rates, or package dimensions are sent to or stored on any server.
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