What this calculator solves
Use Length + Girth when a carrier, marketplace, storage rule, or internal handling standard expresses size as the longest side plus the distance around the other two sides. It answers a perimeter-limit question, not a volume or dimensional-weight question. The calculator sorts the three entered sides so the longest becomes length automatically.
How to choose the inputs
Measure the completed external package, not the empty carton’s nominal size. Record the widest point of flexible, bowed, cylindrical, or irregular packaging and keep all three sides in one unit. If a published rule defines length differently, follow that rule rather than the automatic longest-side convention.
| Input | How to prepare it |
|---|---|
| Side 1 | Measure side 1 on the finished item or container surface named here; keep it in the selected unit and include normal production variation. |
| Side 2 | Measure side 2 on the finished item or container surface named here; keep it in the selected unit and include normal production variation. |
| Side 3 | Measure side 3 on the finished item or container surface named here; keep it in the selected unit and include normal production variation. |
How the calculation works
- Validate the Length + Girth Calculator manifest: confirm that side 1, side 2, side 3 describe the same Length + Girth Calculator pack, batch, or planning period.
- Calculate length + girth: apply Length + girth = longest side + 2 × (second side + shortest side) without rounding intermediate values for Length + Girth Calculator.
- Review the length + girth breakdown: use the primary result for the stated decision and the secondary values to identify the input or constraint driving this Length + Girth Calculator result.
Worked example
For a 30 × 18 × 12 in carton, the longest side is 30 in and girth is 60 in. Length plus girth is 90 in.
Next action: After: compare the total with the governing limit and use Box Size if a smaller packed profile is needed.
How to interpret the result
A result far below a stated limit leaves measurement tolerance; a result close to the limit needs a second measurement after final closure and labeling. If the value is too high, identify whether the longest side or the two-side girth drives the total before changing the pack. Reducing either short side affects girth twice.
Common mistakes
- Entering internal fit dimensions.
- Assuming the first field must already be the longest side.
- Ignoring bulges, handles, tubes, or protective corners.
- Comparing centimeters with a limit published in inches.
Assumptions and limitations
This rectangular calculation does not interpret a specific carrier’s oversize rule, rounding, irregular-shape method, or excluded-package policy. Confirm the definition and threshold in the current official source.
Related workflow
- Before: finish and externally measure the package.
- After: compare the total with the governing limit and use Box Size if a smaller packed profile is needed.