The standard dimensions for a twin-size blanket are approximately 66 inches wide by 90 inches long.
However, it's important to keep in mind that the actual dimensions can vary based on the manufacturer and design of the blanket. Some twin-size blankets may be slightly wider, narrower, a little longer, or shorter than the standard size.
It's always a good idea to check the specifications of a blanket before purchasing it to make sure it will fit your bed correctly.