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.

Verify and correct U.S. addresses against the official USPS database. Get ZIP+4 codes and standardized formatting.

Validate any U.S. address using the official USPS API. Returns standardized address, ZIP+4, and delivery information.

Check if a ZIP code is valid and see its primary city and state using official USPS data.

Format any address to USPS standards. Converts to all caps, applies abbreviations, and formats ZIP codes—all client-side.

Understand any USPS tracking status. Learn what each update means, common causes, and what to do next.

Enter a full address to get the 9-digit ZIP+4 code and USPS-standardized format. Powered by official USPS data.

Get real-time USPS postage rates for domestic and international mail. Compare prices across mail classes.

Calculate total USPS Certified Mail costs including postage, service fees, Return Receipt, and Restricted Delivery options.

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