How much percentile is required in JEE Main to appear for JEE advanced?

To be eligible to appear for JEE Advanced, you need to be among the top 2.5 lakh successful candidates in JEE Main. There is no specific percentile cutoff mentioned officially, as it depends on the overall performance of all candidates in JEE Main. However, based on previous years' trends, you can estimate the required percentile to be around 85-90 percentile to be safe.   

However, please note that this is just an estimate. The actual percentile required may vary depending on the difficulty level of the JEE Main exam and the overall performance of candidates. It's always best to aim for a higher percentile to increase your chances of qualifying for JEE Advanced.