Thank you for your question.
May I know how long ago the offence was committed and what sentence was imposed?
I look forward to your response.
May I know how old you were at the time?
Regrettably since you were not under 18 at the time, you will need to apply for a visitor's visa for the US even though you are a British citizen. This is because the US has very strict immigration rules and any person who has been convicted in the past must obtain a visa (even if the conviction is considered spent in the UK). If you don't get a visa, there is a risk that you will be denied entry to the US and deported back to the UK.
This is confirmed on the website of the US embassy in London:http://london.usembassy.gov/add_req.html
I am assuming you will be travelling as a tourist. You would therefore need to apply for a B2 Visa, which you can apply for here:http://london.usembassy.gov/b2.html
You will also need to provide some additional information:http://london.usembassy.gov/add_crime.html
I hope this answers your question. Please don't forget to click accept. Thanks in advance.
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