What is the value of a US 2 dollar bill?

It's important to know the bill's date.

Circulated, current-issue $2 bills (dates 1976 and later, with green seals) are worth $2. If they are in crisp, uncirculated condition the retail value could be double that.

Older U.S. Notes with red seals can be worth more. Some typical retail values are:

1928: $3-10 circulated / up to $50 uncirculated

1928A: $5-10 circulated / $225 uncirculated

1928B: $20-85 circulated / $700 uncirculated

1928C: $2-10 circulated / $100 uncirculated

1928D: $2-8 circulated / $30 uncirculated

1928E: $2-12 circulated / $65 uncirculated

1928F,G: $2-8 circulated / $25 uncirculated

1953, 53A,B,C: $2-3 circulated / $8 uncirculated

1963, 63A: $2-5 circulated / $4 uncirculated

1976: $2-3 circulated / $3 uncirculated

Busting the myths:

US $2 bills have NEVER been discontinued or recalled and are STILL acceptable for use anywhere any other denomination is valid. They are still being printed (latest series dated 2008) although in much smaller quantities than other denominations.

Don't hoard two dollar bills--spend them. Modern ones will always be worth two dollars and you can get as many as you wish from a bank. If they are out, they can order more.

$2 "Silver Certificates"

There were no $2 silver certificates in any of the common series. From 1928 to 1963, $2 bills were issued only as United States Notes, distinguishable by their red seals. After that they've been issued as standard green-seal Federal Reserve Notes. All US bills have their type in a banner across the top of the bill's front.

This depends on the condition of the bill. In normal used condition, they are worth exactly $2.

$2 bills dated 1976 and newer are the ones worth face value only. The $3/$4 figure is reasonable for bills dating back to the 1950s. Anything older than that, please post a new question that has the bill's specific date and whether there is a little letter next to the date.