Checking the balance on your Oyster card is a quick and easy way to make sure you have enough money to travel on the London Underground, buses, and other Transport for London (TfL) services. You can check your balance in a number of ways, including online, via the TfL app, or at any Oyster card reader.
It is important to check your Oyster card balance regularly to avoid getting caught out with insufficient funds. If you do run out of money on your Oyster card, you will need to top up before you can continue traveling. You can top up your Oyster card online, via the TfL app, or at any Oyster ticket stop.