Shipping Tools for Resellers
Optimize packaging, calculate rates, and avoid costly mistakes. Compare options, open the live tools, and use Underpriced to make faster sourcing and pricing decisions.
Tools in this category
Dimensional Weight Calculator 2026
Calculate dimensional (DIM) weight for USPS, UPS, and FedEx shipping. See which carrier charges less for bulky items based on package size.
USPS Media Mail Eligibility Checker
Quick Yes/No wizard to check if your item qualifies for cheap Media Mail shipping. Avoid costly mistakes. Use the free tool today.
Poly Mailer Size Guide
What size poly mailer for a hoodie? A dress? Find the right poly mailer size for common clothing items. Use the free tool today.
First Class vs Priority Mail Guide
Under 16oz? First Class. Over 16oz? Priority. Simple visual tool to pick the cheapest USPS option. Use the free tool today.
Canada Customs Duty Estimator 2026
Estimate landed cost for US→Canada shipments with category-based duty rates, province tax rates, carrier mode, USMCA toggle, FX conversion,
QR Code Address Label Generator
Convert a shipping address into a QR code. Perfect for printing labels at post office kiosks. Use the free tool today.
Shipping Tools guides
USPS Media Mail Eligibility Rules for Resellers (2026): What Qualifies, What Gets Rejected, and How to Avoid Postage Due
Complete USPS Media Mail guide for resellers in 2026. Learn exactly what qualifies, what triggers postage due, packaging rules, inspection risk, and workflow systems that prevent costly shipping mistakes.
Cheapest Shipping Options for Resellers: Complete Rate Comparison (2026)
Compare USPS, UPS, FedEx, and Pirate Ship rates for resellers in 2026. Real price examples by weight, cubic pricing hacks, free supplies, and how to cut shipping costs by 40%.
Mercari Shipping Guide for Resellers (2026): Labels, Weight Tiers, and Profit-Protecting Workflows
Complete Mercari shipping guide for resellers in 2026. Learn Mercari prepaid vs ship-on-your-own, weight tiers, dimensional risk, packaging systems, and profit-protecting shipping SOPs.