Curated OER
Calculating Postage
High schoolers explore the services available to them at their local post office. As a class, students discuss the function of each method of delivery. High schoolers choose a postal option appropriate to a scenario the instructor...
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Usps: Domestic Rate Calculator
Here is a chart compiled by the United States Postal Service that determines how much postage is required for a letter, large envelope, postcard, and etc. Many links. Link to International Rate Calculator.
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United States Postal Service
As an independent agency of the government, the United States Postal Service homepage offers information on zip codes, address change, stamps, online billing, and variety of other topics.