Every carrier uses a "DIM divisor" to calculate dimensional weight. UPS and FedEx use 139. Most 3PLs use 166. ShippingCow uses 225 — the highest in the industry — which means your billable weight is 38–39% lower. Enter your package dimensions below and see the difference in real dollars.
Length × Width × Height gives you cubic inches. The carrier divides that number by their DIM divisor to get dimensional weight.
If your DIM weight is higher than your actual weight, you pay DIM weight rates. This is how carriers extract extra money from bulky packages.
A higher divisor = lower DIM weight = lower billable weight = you pay less. Our DIM 225 is 62% higher than the UPS/FedEx standard of 139.
Example: A 24×18×16 box that weighs 55 lbs. UPS/FedEx DIM: 49.8 lbs → billable: 55 lbs. ShippingCow DIM: 30.7 lbs → billable: 55 lbs. At 80+ lbs the savings are dramatic — try a heavy package in the calculator above.
Submit your top SKU dimensions and we'll build a custom savings model — no commitment, 24-hour turnaround.