How Many Stamps Do I Need? The US Mail Postage Explained
https://www.postalytics.com/blog/how-many-stamps-do-i-need/
WEBJan 24, 2024 · As an example, for a 1 oz flat, you could use one Domestic Forever Stamp, 1×10-cents, and one postcard stamp, which would cost $1.08, or you could use 2 Domestic Forever Stamps and pay 8 cents too much. You need to weigh the convenience of Domestic Forever Stamps against the cost savings of using a combination of Forever Stamps, Postcard ...
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