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Postage for parcels addressed for delivery to Zones 5-8 and exceeding 1 cubic foot (1,728 cubic inches) is based on the actual weight or the dimensional weight, whichever is greater.
1) Determining Dimensional Weight for Rectangular Parcels
Follow these steps to determine the dimensional weight for a rectangular parcel:
- Measure the length, width, and height in inches. Round off each measurement to the nearest whole inch.
- Multiply the length by the width by the height.
- If the result exceeds 1,728 cubic inches, divide the result by 194 and round up to the next whole number to determine the dimensional weight in pounds.
- If the dimensional weight exceeds 70 pounds, the parcel pays the 70-pound rate.
2) Determining Dimensional Weight for Nonrectangular Parcels
Follow these steps to determine the dimensional weight for a nonrectangular parcel:
- Measure the length, width, and height in inches at their extreme dimensions. Round off each measurement to the nearest whole inch.
- Multiply the length by the width by the height.
- Multiply the result by an adjustment factor of 0.785.
- If the final result exceeds 1,728 cubic inches, divide the result by 194 and round up to the next whole number to determine the dimensional weight in pounds.
- If the dimensional weight exceeds 70 pounds, the parcel pays the 70-pound rate.
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