You've passed the point of no return on this one, since at 1 pound (16 ounces), you're mailing a package rather than a first-class letter. It makes no difference if you try to submit it properly; you'll still wind up on the same table. So, at current pricing as of 4/20/2018, 14 stamps or 50 are required, with an everlasting stamp costing $0.50.
If you send 20 pounds (9 kg) or less via First Class Mail, which costs $5.95 for a standard-size envelope, then you can use the regular size stamp ($1.25). For anything over 20 pounds ($10), you have to buy a large stamp ($3.95).
The post office charges based on the weight of your package. If you exceed the maximum allowed weight, you will be charged extra. The rate varies depending on how far in excess of the maximum limit you go. There is also a charge for sending packages by priority mail ($12.95-$14.95).
In addition to these prices, there is a charge for each additional address on your label. This is called a "handling fee" and it's listed on your bill as "HANDLING CHARGE."
For example, if you send two boxes weighing a total of 30 pounds (13.6 kg), you would pay $35.90 for postage plus handling. Two ordinary-sized letters would cost $0.70 each.
The price of the First-Class Mail Forever stamp will continue at 55 cents, the price of the single-piece letter extra ounce will remain at 15 cents, postcards will remain at 35 cents, and 1 ounce flats will remain at $1.40.
These prices were established by the U.S. Postal Service in January 2005, just months after its merger with first-class mail carrier PPG Industries Inc. The prices have not changed since they were set.
Forever stamps are necessary because ordinary first-class mail is not delivered to all addresses within a year; it's estimated that only about 5% of letters are still in use after one year. The rest have been returned to the sender unopened or discarded by defaulting email accounts or postal bins across the country.
Returning letters and cards to their source is an expensive and time-consuming process for everyone involved. The USPS spends millions of dollars each year on processing and handling expired mail.
There are two types of Forever Stamps: regular and commemorative. The price of both types of stamps remains the same: 55 cents for first-class and $1 for international mail.
In February 2004, the USPS announced plans to launch a new type of stamp called a "forever" stamp.
The price of the First-Class Mail Forever stamp will rise from 50 cents to 55 cents. Priority mail costs will rise by 5.9 percent, raising the cost of a small package from $7.20 to $7.90. Large envelopes will increase from $19.80 to $21.60.
Stamps are needed for correspondence, packages, and merchandise. The postage meter can be used to produce letters up to 2" x 5", postcards, or stickers. It can also be used to print postage at point-of-sale locations such as grocery stores and drugstores. For maximum value, stick to the recommended dosage on the product label.
Stamp collecting is another hobby that has grown in popularity. There are two types of collectors: casual and serious. Casual collectors buy stamps that have subjects that interest them, such as animals, ships, landscapes, and people. They may collect stamps from only a few countries or may expand their collection to include stamps from around the world. Casual collectors don't try to sell their collections and usually keep them for pleasure rather than profit.
The other type of collector is the serious student of philately. These individuals gather stamps into sets, attempt to determine an order of precedence for different issues, and try to find rare stamps.
For a 1 oz letter, a regular rectangular letter-size envelope would require 1 forever stamp. Every additional ounce, up to 3 oz, would cost an additional 21 cents in mail. So it will be $0.49, $0.70, and finally $0.91. Any heavier, and the rate will become a huge flat envelope rate.
The postage for an average-sized postcard is also based on weight: $0.40 for each 0.5 oz of first class mail. So if you were sending one card per day, that would cost $20 per year.
In conclusion, one forever stamp is enough for a regular-sized letter or postcard.