When you enter a weight for your parcel (letters and packages weighing less than 150 pounds), be sure to include the weight of the box and all packing materials. Only an accurate weight will yield an accurate shipping charge. Always round up to the next nearest pound. For shipments of more than 150 pounds, however, a weight estimate is acceptable.
When you enter dimensions for your package, dimensions less than 1/2″ are rounded down to the nearest inch, dimensions greater than 1/2″ are rounded up to the nearest inch. Be sure to measure carefully, because inaccurate measurements will result in inaccurate rates.