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DimCheck

Package Comparison

Compare up to three scenarios — your current box, a smaller one, and a different carrier — across every metric that drives the bill.

Scenario A

in
in
in
lb

Scenario B

in
in
in
lb

Scenario C

in
in
in
lb

What this means

Small differences in dimensions compound through rounding: one fraction of an inch can change a rounded side, the volume, the DIM weight, and a surcharge status. Comparing scenarios side by side shows exactly which change produces which effect.

Potential action

Use the box size optimizer to generate candidate dimensions, then paste the best candidate in as Scenario B here to document the before/after for your team.

Frequently asked questions

Which carriers does the comparison cover?

All four — FedEx, UPS (Daily and Retail separately), USPS, and DHL Express — plus the generic industry-standard divisor. Each scenario runs through the same carrier rules as the per-carrier calculators: rounding per carrier, the correct divisor for the rate table, USPS's one-cubic-foot threshold and 70 lb cap, and surcharge status checks. That is why the same box can show different numbers in different scenarios — and that difference is the point of the tool.

How is DIM penalty calculated?

DIM penalty measures how much the box inflates the bill relative to the package's own weight: the excess of DIM weight over the rounded actual weight, expressed as a percentage of actual weight. A 24 × 18 × 12 in box weighing 8 lb has 38 lb of DIM weight, so the penalty is (38 − 8) ÷ 8 = 375%. DimCheck labels the result No DIM exposure when DIM does not exceed actual weight, Low below 25%, Moderate from 25% up to 100%, and High at 100% or above — so three scenarios are easy to scan for which one is box-driven and which is weight-driven.