How many ounces can one stamp mail

According to the United States Postal Service (USPS), the maximum weight and size for a standard letter or postcard is:

• Weight: 3.5 ounces (99 grams)
• Size: 5-1/2 inches (14 cm) long, 4-1/4 inches (11 cm) wide, and 0.007 inch (0.18 mm) thick

If your item weighs more than 3.5 ounces, you'll need to use a larger envelope or package, such as a flat rate envelope or a priority mail package. These options have different weight limits and prices.

Here are some examples of USPS mail classes and their corresponding weight limits:

• First-Class Mail Letters: 3.5 ounces (99 grams)
• First-Class Mail Flats: 13 ounces (368 grams)
• Priority Mail: 70 pounds (31.8 kg)
• Priority Mail Express: 70 pounds (31.8 kg)

Keep in mind that these are general guidelines, and specific requirements may vary depending on the type of mail, destination, and other factors. If you're unsure about the weight or size of your item, it's always a good idea to check with your local post office or the USPS website for more information.