Package analyzer
Measure once and get the whole picture: volume, girth, length plus girth, the weight you will actually be billed on, and whether each carrier will take it. Everything the other tools answer separately, in one pass.
What the analyzer works out
- Geometry — longest side, girth, length plus girth, and volume in three units. None of this depends on a carrier rule, so all of it is exact.
- Billable weight — the dimensional weight for the service, and whether that or the actual weight is the one you pay on.
- Air weight — our shorthand for billable minus actual: the pounds you are charged for that are not there. It is our phrase, not a carrier's.
- Acceptance — whether the package is inside every size and weight limit we hold a rule for, and which measurements we could not check.
What it will not tell you
A price. Billable weight is one input to a rate; zone, service level, fuel, and surcharges are the rest, and we have no rating integration. Anything quoting you a postage figure from dimensions alone is guessing at the other half.
Worked example
A 20 × 14 × 12 in box weighing 5 lb, on USPS.
- Volume 3,360 cu in; longest side 20 in; girth 52 in; length plus girth 72 in.
- Dimensional weight is 3,360 ÷ 139 = 24.17 lb, rounded up to 25 lb.
- 25 lb beats the 5 lb it weighs, so billable weight is 25 lb.
- Air weight is 20 lb — four fifths of what you are paying for is empty space.
- At 72 in length plus girth it is comfortably inside every limit we hold.
Edge cases worth knowing
- Measure the outside for carriers. The box-fit tool wants inside measurements; this one wants what the carrier will measure.
- Accepted does not mean cheap. A package can be inside every limit and still be billed at five times its weight.
- FedEx gives no billable weight. We hold no verified divisor for it, so the comparison shows acceptance but not weight.
- A big air weight is an opportunity. It is the one number here that a smaller box directly reduces.
Common questions
- What is "air weight"?
- Our shorthand for billable weight minus actual weight — the pounds you pay for that are not in the box. Carriers do not use the term; we label it as ours wherever it appears.
- Why does this not show a shipping price?
- Because we have no rating integration, and a price built from dimensions alone would be a guess. Billable weight is the part we can compute honestly.
- Which service should I pick?
- Start with "every carrier" to see billable weight and acceptance side by side, then switch to one service for the full breakdown.
- Does this replace the other tools?
- It covers the same ground faster. The individual tools go deeper on their own question, and they share the same code, so the answers always agree.