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Live USPS Postage Estimates

USPS Mailing Cost Calculator

Calculate postage costs for domestic and international mail. Get real-time USPS rates for letters, flats, and packages.

Round up to the next ounce; USPS charges by rounded weight.

For a standard #10 envelope, choose 'Letter'.

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This is an independent estimation tool and is not affiliated with, endorsed by, or connected to the United States Postal Service (USPS). USPS® is a registered trademark of the United States Postal Service. All rate estimates are provided for informational purposes only. Always verify current rates at usps.com or at your local post office before mailing.

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