Free USPS Mail Tools & Calculators
Plan your mailings with our free tools. Estimate delivery times between states, understand USPS service options, and make smarter mailing decisions.
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 the official USPS database. 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 official USPS 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. Powered by official USPS data.
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