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Parcel Length & Girth Calculator

Enter the outside measurements of a packed rectangular box. We select the longest side and calculate its length plus girth.

Parcel Length & Girth Calculator

Measure the finished rectangular box outside its packaging. Enter the three measurements in any order.

A rectangular box with three outside measurements, labeled 1, 2 and 3. The drawing is not to scale.132

1: Side A · 2: Side B · 3: Side C — Drawing not to scale

Greater than zero; maximum 300 cm.

Greater than zero; maximum 300 cm.

Greater than zero; maximum 300 cm.

Use a dot or comma for decimals (up to 6 places). A comma is a decimal separator: 1,000 means 1, not one thousand.

Compare with your limit

Enable only for a combined length-plus-girth limit. A longest-side limit, airline three-side sum, volume or weight limit is a different check. Opening this section does not enable comparison; closing it does not disable it.

Greater than zero; maximum 1500 cm.

Length + girth

Enter all three outside measurements to calculate length plus girth.

Rectangular-box calculation only. A numerical comparison does not guarantee shipping acceptance. Check separate dimensions, weight, packaging, contents, service, destination and measuring rules with your carrier.

Calculations run locally. Inputs stay in page memory; the surrounding site may make normal requests and use consent-aware integrations.

How to calculate parcel length plus girth

  1. Choose centimeters or inches and enter the three outside measurements in any order.
  2. Read the combined size. Expand the calculation to see the longest side, girth and equivalent result in the other unit.
  3. Optionally enable Compare with your limit and enter a combined length-plus-girth limit, then copy or print the current qualified summary.

What this calculator does

  • Automatically identifies the longest side, so measurement order does not matter.
  • Keeps the combined size prominent and explains girth in a readable calculation.
  • Converts centimeters and inches while preserving untouched physical measurements.
  • Optionally compares with one limit you enter and provides a clear copy or print summary.

When this helps

  • Calculate the combined size of a rectangular parcel before consulting shipping requirements.
  • Compare a measured box with an explicitly stated length-plus-girth limit, including a limit in the other unit.
  • Understand why a parcel's cross-sectional perimeter differs from the sum of three luggage dimensions.

Measuring a box and understanding the result

Measure the finished box outside its packaging. The longest dimension is length. For a rectangular cross-section, girth is twice the sum of the other two dimensions; combined size adds that girth to length.

Compare only with a requirement that actually uses length plus girth. A longest-side restriction, airline three-side sum, weight or dimensional-weight rule is a different calculation. A numerical comparison is not shipping acceptance or a price quote.

Display rounding is for readability, not a carrier's measuring policy. Untouched converted fields retain their original physical values; editing a converted field makes that newly entered measurement authoritative.

Worked examples, not carrier allowances

A 60 × 40 × 30 cm box has a 60 cm longest side and 140 cm girth. Its length plus girth is 200 cm, not the 130 cm sum of the three dimensions.

A 20 cm cube has 80 cm girth and 100 cm combined size. Compared with an invented 110 cm combined-size limit, it is 10 cm below that number. Other shipping conditions remain unchecked.

A 30 × 20 × 10 inch box has 60 inches of girth and 90 inches combined size, exactly 228.6 cm. An entered 228.6 cm limit gives equality with no numerical margin, not carrier approval.

What this result does not check

This method is for rectangular boxes. For cylinders, irregular packages or protruding contents, follow the chosen service's measurement instructions; a rectangular bounding-box calculation is not a certified girth measurement.

No carrier limit, fee, weight, dimensional weight, service eligibility, destination condition or packaging approval is inferred. Verify applicable measuring and rounding rules with your carrier.

Your calculation inputs

Measurements and limits stay in page memory; this calculator adds no upload, saved parcel or share link containing them. Copy and print happen only when requested.

The surrounding website can make normal requests and use its existing consent or analytics settings. Calculator input-locality is not a whole-site privacy certification.

Questions about parcel length and girth

Any of the three outside measurements. The calculator identifies the longest side automatically; equal longest sides do not require a tie-breaking choice.

Girth goes around the two dimensions perpendicular to the longest side: twice their sum for a rectangular box. Length plus girth adds the longest side once.

No. Airline three-side sums add each dimension once. This rectangular parcel method adds the longest side once and each other dimension twice. Check which measurement your requirement uses.

No. It compares only that combined-size number. Separate dimensions, weight, packaging, contents, service, destination and measurement rules can still matter. Closing the comparison section does not disable an enabled comparison.

No. This tool calculates lengths and an optional numerical comparison. It does not apply carrier tariffs, dimensional-weight divisors, weight rounding or surcharges.

Physical measurements are converted, not relabeled. Untouched rounded fields retain their original values; a real edit establishes a new measurement. A conversion that would erase a tiny positive value or exceed a bound is declined.

Not as a certified measurement. Its doubled-side formula describes a rectangular cross-section. Follow your carrier's instructions for other shapes and their widest points.

Sources and scope

USPS explains parcel measurement; DHL defines rectangular Gurtmaß and separate conditions. These are method examples, not default carrier limits. NIST supports the exact inch conversion.

Sources checked: 4 October 2026.

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