How long can you stay in the US from UK?

The United Kingdom is a member of the Visa Waiver Program. This means you do not need to apply for a separate tourist visa to enter the United States. Entry on the Visa Waiver Program grants you up to 90 days' stay in the US. When you enter, you will receive a little white form called an I-90 and the officer will stamp it with how long you can stay. Be sure to check it carefully because there is no guarantee the officer will give you 90 days' stay.