Package Girth Calculator
Carriers cap parcel size by length plus girth, not just length. Enter the box dimensions and a carrier limit to see the girth, the length-plus-girth measurement and whether the parcel is within the limit.
How to calculate package girth
- Enter the longest side as the length, in inches.
- Enter the width and height in inches.
- Set your carrier length-plus-girth limit, commonly 165 in.
- Read the girth, length plus girth and whether it fits.
Examples
Standard box within the limit
30 x 20 x 15 in, limit 165 in
Girth 70 in, length plus girth 100 in, within limit
Oversize box over the limit
50 x 30 x 30 in, limit 165 in
Girth 120 in, length plus girth 170 in, over the limit
Frequently asked questions
How is girth calculated?
Girth is the distance around the two smaller sides of a parcel, calculated as 2 times width plus height. Length plus girth then adds the longest side. Carriers use length plus girth, not length alone, to decide whether a parcel is oversize.
Which side is the length?
Carriers use the single longest dimension as the length and measure girth around the other two sides. For an accurate check, enter your longest dimension in the length field so the girth is measured around the two shorter sides.
What is a typical length-plus-girth limit?
Many US ground services allow up to 165 inches of length plus girth, with a separate length cap and surcharges for large packages. Limits vary by carrier and service, so check your rate card and enter the value it lists.
What happens if a parcel is over the limit?
Parcels over the length-plus-girth limit are usually refused or charged large oversize and additional handling fees. Reducing the box size or splitting the contents into smaller cartons often avoids those surcharges.
Is my data stored?
No. The calculation runs entirely in your browser. Nothing you type is sent to a server or saved, so your dimensions stay private on your device.
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