Log on to the Washington Area Transit Authority website. On the homepage you will see a navigation bar at the top. Click on the fares and a drop-down menu will appear. Click on SmarTrip. A new page will appear.
Click on "Managing Your SmarTrip Account." Click on "Create a SmarTrip Account." If you already have a SmarTrip account, simply click "Log in to Your Account." To create an account you will need to supply your name, address, birthday, email address and phone number as well as the serial number on the back of the SmarTrip card. To log in, supply your user name and password.
Click on the balance to see the amount still assigned to the card. From this screen you can also access the history of the card's usage.