CartonMetricPlan a package
Right-size a carton

Box size comparison

A small change in each side can move a package across a rounded weight or size threshold. Compare the geometry before changing supplies.

Transparent formulaInputs stay on-deviceVerify before shipping
Box comparison

Test a tighter carton before changing supplies.

Compare the current package with a candidate box using the same actual weight and carrier rule.

01Finished package
Candidate box
0 saved on this device
02Planning result
Current box13 lb18 × 12 × 8 in
Candidate box7 lb16 × 10 × 6 in
Planning difference6 lb

Positive means the candidate produces a lower estimated billable weight. Confirm safe fit with a physical pack test.

UPS Daily 139Rule reviewed 30 Jul 2026
Primary source
Calculated on this device. Inputs are not sent to analytics.

Compare the complete package

Use packed outer dimensions, not the nominal internal dimensions printed in a box catalogue. Include bulges and the furthest points of irregular packaging.

Lower volume is not automatically better

A carton still needs enough room for protection and closure. This tool reports geometry; it does not model fragility, crush strength or void-fill performance.