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Logistics

Parcel DIM-Weight Calculator

Price a parcel by its cube: billable weight at the published divisor against a negotiated one and a smaller box, with the surcharges no carton change removes kept in their own line.

Runs in your browser Audited by Gini Loh
Instrument panel Deterministic · nothing leaves the page
Volume and divisors4
parcels

139 is the published daily rate at UPS and FedEx. USPS bills at 166.

A larger divisor bills fewer pounds for the same box.

$

The incremental rate on the excess pounds, not the whole freight bill.

Surcharges5
$

Decimal: 0.70 is 70% of parcels.

$
$
Right-sizing1
in

A ceiling, assuming the contents still fit.

Recoverable a year$894kdivisor plus a smaller box
Excess billed pounds238.5ka month, across the carton mix
Structural a year$931kresidential and delivery area

Recoverable by contract and carton

$893,520 a year comes back from the divisor and a smaller box, against $1,946,160 billed on cube alone.

Master carton B is the worst offender: 31 lb of air per parcel, billed at 50 lb against a scale weight of 19 lb. A divisor move to 166 alone returns $501,840.

Billable weight by cartondivisor 139 → 166, 2" smaller
Master carton A · scale weight10 lb
Master carton A · billed today22 lb
12 lb of the charge is cube, 70" of girth
Master carton A · after the fix16 lb
Master carton B · scale weight19 lb
Master carton B · billed today50 lb
31 lb of the charge is cube, 92" of girth
Master carton B · after the fix37 lb
Master carton C · scale weight4 lb
Master carton C · billed today7 lb
3 lb of the charge is cube, 48" of girth
Master carton C · after the fix5 lb
Scale weightBilled todayAfter the fix
Billable weight by carton
CartonScale weightBilled todayAfter the fix
Master carton A10 lb22 lb16 lb
Master carton B19 lb50 lb37 lb
Master carton C4 lb7 lb5 lb
What comes back, and what does noteffective 2026-01-01
Divisor renegotiation$502k
$2.79 a parcel against $0.38 from a 4% base discount
Divisor and right-sizing$894k
Billed on cube$1.9m
a carrier rule, not an error
Structural surcharges$931k
no carton or divisor change removes these
  • Excess billed pounds are the carrier's rule, not a billing error. $1,946,160 a year of it is priced at today's box, and only the divisor and right-sizing lines are recoverable.
  • Residential and delivery-area surcharges ($77,595 a month) are structural. No carton or contract term in this model removes them.
  • The right-sizing saving assumes 2" can come out of the box and the contents still fit. It is a ceiling, not a specification.

When three box averages is not enough

This estimate prices three cartons. ParcelProof reads the carrier's invoice and shipment file line by line, recomputes every rule-triggered charge and names the ones with no basis.

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Operator notes

How to run it

    ['\t\t\t\t
  1. 1. Enter monthly parcels and the divisor you are billed on: 139 is the published daily rate.
    2. ', '\t\t\t\t
  2. 2. Set the divisor in the contract you are negotiating and the incremental rate per billed pound.
    3. ', '\t\t\t\t
  3. 3. Add the residential and delivery-area surcharges — they price the structural block.
    4. ', '\t\t\t\t
  4. 4. Set the height a better carton would remove, then read the recoverable figure and the structural one separately.
    5. ', '\t\t\t\t
  5. 5. Take the divisor lever to the carrier and the carton change to your packaging supplier. They are different negotiations.
    6. ']

Model logic

Billable weight = max(scale weight, ⌈L × W × H ÷ divisor⌉), each dimension rounded up. The saving is the billed weight today minus the billed weight at the negotiated divisor and the smaller box, priced at the incremental rate per pound.

FAQ

Is excess billed weight a billing error?

No. Carriers are entitled to bill dimensional weight. The saving comes from a smaller box or a better divisor, which is why the recoverable figure never includes the whole excess-weight cost.

Why are residential and delivery-area fees separate?

Because no carton, divisor or negotiation in this model removes them. Adding them to the recoverable total would make the estimate look better and be wrong.

When does a parcel become a large package?

At 165 inches of length plus girth, or 96 inches of length. The 130-inch threshold is Additional Handling, a much smaller charge, and the page flags them separately.

Why does 139 become 166?

The divisor is a contract term. A larger divisor divides the same cube into fewer billed pounds, so the same box bills lighter. Published rates are the starting point, not the floor.

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