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Girth and length + girth calculator

Calculate parcel girth and combined length plus girth, and check it against the 108 and 130 inch limits USPS, UPS and FedEx apply before charging oversize.

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Parcel dimensions

Enter the three sides in any order — the longest is always treated as the length, which is how carriers measure.

Length, width and height

Against carrier limits

  • USPS — most servicesWithin 108"
  • USPS Ground AdvantageWithin 130"
  • UPS & FedExWithin 165"
Length + girth
90 in

Girth alone: 60 in

Longest side
30 in
In inches
90 in
Step-by-step breakdown of the calculation
StepWorkingResult
Longest side (treated as length)Carriers always measure the longest side as the length, whatever order you enter.30 in
GirthGirth is the distance around the parcel at its thickest point.60 in
Length + girth90 in

Questions people ask about this

How do you calculate girth?

Girth is twice the width plus twice the height, using the two shorter sides. Combined length and girth adds the longest side to that. For a 30 by 20 by 10 inch box: girth is 2 × (20 + 10) = 60 inches, and length plus girth is 30 + 60 = 90 inches.

Which side counts as the length?

Always the longest one, no matter which box you typed it into. Carriers measure the parcel, not your data entry, so this calculator sorts the dimensions for you.

What is the USPS size limit?

108 inches combined length and girth for most services, and 130 inches for USPS Ground Advantage. Between 108 and 130 inches a Ground Advantage parcel is accepted but priced as oversize. Above 130 inches it is not mailable.

Related calculators

Dimensional weightBillable weight in pounds using each carrier's current divisor, side by side.Size limitsPass, surcharge or refuse, across every carrier at once.Volumetric weightMetric volumetric weight with the divisor your carrier actually uses.Chargeable weightThe greater of actual and volumetric, with the carrier's rounding applied.

Where these numbers come from

Rates and rules change, and a calculator running on stale data is worse than no calculator. Every figure below carries the date we last checked it and a confidence level, so you can judge how much weight to put on it.

Source Publisher Effective Confidence
Parcel size, weight and fee standards Combined length and girth: 108 inches maximum for most services, 130 inches for USPS Ground Advantage. Between 108 and 130 inches the parcel is priced as oversize. USPS — Primary source

Page last reviewed . Spotted something out of date? Tell us — corrections are published with the date they were made.