Here's a breakdown for the United States Postal Service (USPS) since you haven't specified a country:
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Forever Stamp: This stamp is currently priced at $0.68 and is valid for mailing a standard one-ounce letter within the United States [1].
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Additional Weight: If your letter weighs more than one ounce, you'll need additional postage. The USPS website has a postage calculator tool to help you determine the exact cost based on weight and destination: [invalid URL removed]
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International Stamps: Prices for international postage vary depending on the destination country and mail type. You can find the USPS international rates here: [invalid URL removed]
If you're located in Egypt, you'll need to check with the Egyptian Postal Authority for their current stamp prices and mail rates. Their website might be in Arabic, but here's a link for your reference: [invalid URL removed]