Girth Calculator
Work out girth and length plus girth from your box size, and check it against UPS, FedEx, USPS and DHL parcel size limits.
Length is the single longest side. Girth wraps the other two: 2 × (side2 + side3).
| Carrier limit (L + girth) | Max | Status |
|---|---|---|
| UPS Ground | 165" | Within |
| FedEx Ground | 165" | Within |
| USPS Ground Advantage / Priority | 130" | Within |
| DHL Express | 118" | Within |
What girth means
Carriers limit parcel size using two numbers: the length (the single longest side) and the girth (the distance around the box at its thickest point). Girth wraps the two shorter sides:
girth = 2 × (side2 + side3)
length + girth = longest side + girth
Most size limits are written as a maximum length plus girth, so that is the figure this calculator highlights.
Worked example
For a 30 × 20 × 15 in box:
- Longest side (length): 30 in
- Girth: 2 × (20 + 15) = 70 in
- Length + girth: 30 + 70 = 100 in
At 100 in, that box is within the UPS, FedEx and USPS limits below, so it ships as a standard parcel rather than an oversize one.
Carrier size limits (length + girth)
| Carrier | Max length | Max length + girth |
|---|---|---|
| UPS Ground | 108 in | 165 in |
| FedEx Ground | 108 in | 165 in |
| USPS Ground Advantage / Priority | 108 in | 130 in |
| DHL Express | 47 in | 118 in |
Going over a limit usually pushes a package into an oversize or additional-handling tier, or it may be refused. Confirm the current limit with your carrier, since they revise these periodically.
To estimate the billed weight of the same box, use the dimensional weight calculator; for the raw cubic volume, use the box volume calculator.