USPS Shipping Rate Estimator
Estimate postage costs for Ground Advantage, Priority Mail, and Priority Mail Express.
Shipping Estimate Summary
How USPS Shipping Rates Are Calculated
Calculating USPS shipping costs involves several key factors that determine the final price of your label. Unlike a flat-rate service, standard USPS pricing is dynamic and changes based on the package's physical characteristics and travel distance.
1. Shipping Zones (Distance)
The USPS divides the United States into nine "Zones." These zones are not fixed geographic locations but are relative to your origin zip code. Zone 1 is local (usually within 50 miles), while Zone 9 represents the furthest territories. The higher the zone number, the more expensive the postage will be.
2. Actual Weight vs. Dimensional Weight
For most services, the price is based on the actual weight of the package (rounded up to the next pound). However, for large, lightweight packages, USPS uses Dimensional Weight (DIM weight). This is calculated by multiplying Length x Width x Height and dividing by 166. USPS charges based on whichever number is higher: the physical weight or the DIM weight.
3. USPS Service Levels
- Ground Advantage: The most economical way to ship packages up to 70 lbs. It replaced First-Class Package Service and Retail Ground.
- Priority Mail: A faster service (1-3 business days) that includes $100 of insurance and tracking.
- Priority Mail Express: The fastest domestic service with guaranteed overnight delivery to most locations.
Example Calculation
Suppose you are shipping a 5lb package from New York (10001) to Los Angeles (90210):
- Distance: This qualifies as Zone 8.
- Ground Advantage Estimate: Approximately $18.50 – $22.00.
- Priority Mail Estimate: Approximately $24.00 – $28.00.
- Express Estimate: Often exceeds $65.00 depending on dimensions.
Pro Tip: Use Commercial Pricing
Retail rates (what you pay at the Post Office counter) are significantly higher than "Commercial Plus" pricing available through online shipping software. You can often save 15-40% by printing your USPS labels online rather than paying at the window.