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Zones measure distance from this ZIP: zone 1 is nearby, zone 8 is the far side of the country. This looks up the official USPS zone chart for your ZIP and picks the furthest zone in the lower 48 (no AK, HI, territories or military). Last checked against the chart effective October 1, 2026.
UPS zones differ from USPS zones. Check yours on UPS's zone chart for your ZIP, under "Calculate time and cost" → zone charts.
eBay charges its final value fee on the sales tax as well, so a higher tax rate raises your fees. The US average combined rate is about 7–8%. UPS dimensional weight is L×W×H ÷ divisor (139 is standard).