USPS mail tools
Simple tools for tracking mail, validating addresses, estimating delivery times, and calculating postage.
USPS Package Tracking
Track any USPS package in real-time. Check delivery status for Priority Mail, Certified Mail, First-Class packages, and all USPS services.
USPS Delivery Time Estimator
Estimate how long mail takes between any two U.S. states for First-Class and Priority Mail.
USPS Address Validator
Verify and correct U.S. addresses against USPS address data. Get ZIP+4 codes and standardized formatting.
ZIP Code Validator & City/State Lookup
Check if a ZIP code is valid and see its primary city and state using USPS city/state data.
USPS-Style Address Standardizer
Format any address to USPS standards. Converts to all caps, applies abbreviations, and formats ZIP codes—all client-side.
USPS Tracking Status Explainer
Understand any USPS tracking status. Learn what each update means, common causes, and what to do next.
ZIP+4 Lookup Tool
Enter a full address to get the 9-digit ZIP+4 code and USPS-standardized format using USPS address data.
USPS Mailing Cost Calculator
Get real-time USPS postage rates for domestic and international mail. Compare prices across mail classes.
Certified Mail Fee Calculator
Calculate total USPS Certified Mail costs including postage, service fees, Return Receipt, and Restricted Delivery options.