Shipping Cost Calculator
Free Shipping cost Calculator for shipping. Enter your stats to get performance metrics and improvement targets. Free to use with no signup required.
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer
Shipping Cost Calculator
Calculator
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Formula: DIM Weight = L×W×H / 139 (USPS/UPS/FedEx) | Billable = max(Actual, DIM)
Worked example — Billed at 25.9 lbs
Formula
DIM Weight = L×W×H / 139 (USPS/UPS/FedEx) | Billable = max(Actual, DIM)
Carriers charge by whichever is greater: actual weight or dimensional weight. DIM divisor: 139 for domestic, 166 for international.
Worked Examples
Example 1: Light large box
Problem:2 lbs, 20×15×12 inches
Solution:DIM = 20×15×12/139 = 25.9 lbs → billed at 25.9
Result:Billed at 25.9 lbs
Example 2: Heavy compact box (actual weight wins)
Problem:35 lbs, 14×12×10 inches
Solution:DIM = 14×12×10/139 = 12.1 lbs. Actual (35 lbs) exceeds DIM, so billable = max(35, 12.1)
Result:Billed at 35 lbs (actual weight governs)
Frequently Asked Questions
How can I reduce shipping costs when DIM weight is higher than actual weight?
Use the smallest box that safely fits your product, eliminate unnecessary void fill, consider flexible poly mailers for soft goods, and consolidate multiple items into one shipment. Some carriers offer flat-rate boxes where DIM weight is irrelevant — useful for dense, heavy items in small packages. Custom or right-sized packaging can dramatically reduce billable weight.
Should I use the domestic (139) or international (166) DIM divisor?
Use 139 for shipments within the United States via UPS, FedEx, or USPS Priority Mail — this is the standard domestic divisor as of the carriers' current rate guides. Use 166 for international shipments and for USPS First-Class Package International Service, since the international standard treats a cubic inch of space as less costly per pound, producing a lower DIM weight for the same box. Always confirm the specific carrier and service tier's current divisor before shipping high-volume or oversized freight, since carriers periodically revise these figures.
Why did my invoice charge more than Shipping Cost Calculator's billable weight suggests?
Beyond dimensional weight, carriers layer on additional per-package surcharges that Shipping Cost Calculator does not model directly: residential delivery fees, fuel surcharges (a percentage added on top of the base rate that fluctuates with oil prices), signature confirmation, and additional handling fees for packages that are oddly shaped, poorly packaged, or exceed size thresholds (over 96 inches in length, for instance). The billable weight from Shipping Cost Calculator is the starting point carriers use to look up the base rate on their published rate chart — the final invoice total adds these surcharges on top.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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