Package Girth Calculator
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Girth = 2 × (width + height). Carriers often cap length + girth to define an "oversize" or "large package" surcharge.
Package dimensions
Length + girth
56 in
Girth: 36 in
- Girth
- 36 in
- Length + girth
- 56 in
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What girth means for shipping
Girth is the distance around the two shorter sides of a package — calculated as 2 × (width + height), assuming length is the longest side. Carriers use "length + girth" as a single combined number to flag oversized packages that need special handling, regardless of actual weight.
Major US carriers commonly apply additional fees or size restrictions once length + girth exceeds 130 inches, and refuse shipment altogether beyond about 165 inches (limits vary by carrier and service level, and change over time) — always verify current thresholds with your specific carrier before shipping an unusually large box.
Example: a box measuring 20 × 10 × 8 in has a girth of 36 in (2 × (10 + 8)), for a length + girth total of 56 in (20 + 36) — comfortably under typical oversize thresholds.
Common questions
Which dimension counts as "length" for girth?
The longest side of the package is treated as length. The other two sides (width and height) are used to calculate girth: 2 × (width + height).
What happens if my package exceeds the oversize limit?
Carriers typically apply an additional oversize or "large package" surcharge, and some refuse shipment entirely above a maximum length + girth threshold. Check your specific carrier's current published limits.