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Package Girth Calculator

Calculate parcel girth (2 × (width + height)) and length + girth, used for carrier size limits. Metric or imperial. Runs in your browser.

Girth
36cm
Length + girth
66cm

Carriers cap parcels by length + girth, using the longest side as “length”. Exact limits vary by carrier and service.

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A free package girth calculator that runs entirely in your browser. Girth is the distance around the thickest part of a parcel (2 × (width + height)) and carriers often cap parcels by length + girth, which is length + 2 × (width + height), using the longest side as the length. Enter the length, width, and height in centimetres or inches to get both the girth and the length + girth total. This is a general calculator to help you check a parcel against a size limit; it does not embed any specific carrier’s limit, because those vary by carrier and service and can change. Nothing you enter is uploaded or stored.

01

How to use this tool

  1. 01Choose your unitsPick centimetres or inches to match the limit you are checking against.
  2. 02Enter the dimensionsEnter the longest side as the length, then the width and height. Choosing the longest side as length matches how most carriers measure length + girth.
  3. 03Read girth and length + girthThe tool shows the girth (2 × (width + height)) and the length + girth total to compare with your carrier’s limit.
03

Examples

  • A 30 × 10 × 8 boxGirth = 2 × (10 + 8) = 36. Length + girth = 30 + 36 = 66.
  • A cubeA 12 × 12 × 12 box: girth = 2 × (12 + 12) = 48, and length + girth = 12 + 48 = 60.
  • Choosing the lengthIf sides are 20, 35, and 15, use 35 as the length: girth = 2 × (20 + 15) = 70, length + girth = 35 + 70 = 105.

  • Why length + girth matters

    Carriers use length + girth to limit how large a parcel can be for a given service, since a long or bulky parcel is harder to handle. Staying under the published limit avoids surcharges or a parcel being rejected or reclassified as freight.

  • Sources and limitations

    This tool is an educational estimate and is not affiliated with any carrier. The formulas (girth = 2 × (width + height); length + girth = length + 2 × (width + height)) are standard, but each carrier and service sets its own size limits and rules for choosing the "length" side, and these can change. Check your carrier’s current documentation for the exact limit.

05

Frequently asked questions

What is package girth?

Girth is the distance around the parcel at its thickest point: 2 × (width + height). It measures how bulky the parcel is around its cross-section.

How do I calculate length + girth?

Length + girth = length + 2 × (width + height), using the longest side as the length. Carriers commonly use this total for parcel size limits.

Which side is the length?

Use the single longest side as the length, then the remaining two sides as width and height. That is how most carriers compute length + girth.

What is a typical size limit?

Limits vary by carrier and service, so this tool does not assume one. Check your carrier’s current documentation and compare it with the length + girth this tool shows.

Does girth use inches or centimetres?

Either, match the units of the limit you are checking. The tool supports both centimetres and inches.

Is my data stored?

No. Everything runs in your browser. Nothing you enter is uploaded, saved, or shared.

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