Enter the two smallest dimensions of the length, width, and height into the calculator to determine the girth of a package or parcel.

Girth Formula

The following formula is used to calculate the girth of a shipping parcel.

G = (D1 + D2) * 2
  • Where G is the girth
  • D1 is the smallest dimension of the package
  • D2 is the second smallest dimension of the package

To calculate the girth, add the smallest dimension and the second smallest dimension together, then multiply by 2.

The units for all 3 are typically expressed in inches, but they can be any units as long as they are consistent.

Girth Definition

What is girth?

Girth is a term used in shipping and receiving to describe 2 times the sum of the smallest dimensions of a package. For example, if the length and width are the smallest dimensions, they would be used in the calculation.

Example Problem

How to calculate girth?

  1. First, measure the length, width, and height of the package.

    For this example, these measured to be 20 inches, 10 inches, and 5 inches respectively.

  2. Next, choose the two smallest dimensions.

    In this case, the width and height are the smallest dimensions at 10 in and 5 in.

  3. Finally, calculate the girth.

    Using the formula above, the girth is calculated to be:
    G = (D1 + D2) * 2
    G = (10 + 5) * 2
    G = 30


Why is calculating the girth of a package important for shipping?
Calculating the girth of a package is crucial for shipping because it helps determine if the package meets the carrier’s size restrictions and affects the shipping cost. Carriers often have maximum girth limits for standard shipping options, and exceeding these limits can result in additional charges.

Can the girth formula be used for packages of any shape?
Yes, the girth formula can be applied to packages of any shape, as long as you can accurately measure the length, width, and height of the package. However, for irregularly shaped packages, determining the smallest and second smallest dimensions might require more careful measurement and consideration.

How do different carriers use the girth measurement in determining shipping costs?
Different carriers use the girth measurement along with the weight of the package to calculate shipping costs. Some carriers may have a dimensional weight pricing model, where the package’s size can affect the cost as much as its actual weight, especially for large but lightweight packages. Knowing the girth helps in estimating these costs more accurately.