If you are spending fifty cents on stamps to mail something that costs
five cents, some people would say "it's not worth the postage to
send it." If someone wrote something that another person didn't like,
the recipient might say "it's not worth the paper it's written on" (which
means the recipient thinks that what was written was worthless).
It is worth 15 cents.
US postage stamps do not expire -- they are always worth face value as postage.
That was issued in 1981 when postage went from 18 cents to 20 cents. It can still be used for 20 cents worth of postage.
It is worth the original cost of the stamp.
If it says US Addresses Only it is good for 32 cents worth of postage. The Make Up stamp is worth 3 cents.
.32 Cents
$0.20
Scott number US 2818 has a catalog value of $1.50 if it is mint and unused. Which means a dealer, if they are willing to buy a single copy, might give you 50 cents for it if he's felling generous. It can be used for 29 cents worth of postage.
Hank Aaron is still alive. Which means he cannot be on a US Postage Stamp.
The B stamp pictures a stylized eagle. It has a value of 18 cents. You can still use it for 18 cents worth of postage.
The ones with a flag are worth 2 cents. Additional postage must be added to make the current rate. They are good for US addresses only.
That depends on many factors. A stamp is worth its face value for use as postage. If you have something that is old and is rare, it could be worth some money. Today's First Class postage stamps are 44 cents.