Mail weight chart

Here is a general mail weight chart for the United States Postal Service (USPS):

Letters

• Postcard: up to 1 oz (0.5 oz average weight)
• Letter (1 oz): 1 oz
• Letter (2 oz): 2 oz
• Letter (3 oz): 3 oz
• Letter (3.5 oz): 3.5 oz (max weight for standard letter rates)

Large Envelopes (Flats)

• Flat (1 oz): 1 oz
• Flat (2 oz): 2 oz
• Flat (3 oz): 3 oz
• Flat (3.5 oz): 3.5 oz (max weight for standard flat rates)

Packages

• Small Package (1 oz): 1 oz
• Small Package (2 oz): 2 oz
• Small Package (3 oz): 3 oz
• Small Package (3.5 oz): 3.5 oz (max weight for standard package rates)
• Medium Package (1-2 lbs): 1-2 lbs
• Large Package (2-3 lbs): 2-3 lbs
• Extra Large Package (3-4 lbs): 3-4 lbs
• Extra Extra Large Package (4-5 lbs): 4-5 lbs

Specialty Mail

• Priority Mail Express: up to 70 lbs
• Priority Mail: up to 70 lbs
• First-Class Package Service: up to 70 lbs
• Parcel Post: up to 70 lbs

International Mail

• First-Class International: up to 1 lb
• Priority Mail International: up to 70 lbs
• Priority Mail Express International: up to 70 lbs

Please note that these are general guidelines and that specific weight limits may apply to certain types of mail or packages. It's always a good idea to check with the USPS or consult their website for the most up-to-date information on mail weight charts and rates.