The number of subscribers you need to make money on YouTube can vary depending on several factors, such as the type of ads that are shown on your videos, the number of views your videos receive, and the niche or topic of your channel. Generally speaking, you will need a minimum of 1,000 subscribers and 4,000 hours of watch time to be able to monetize your videos through the YouTube Partner Program. Once you meet these requirements, YouTube will place ads on your videos and you will earn a portion of the revenue from these ads. Keep in mind that the amount of money you can earn from ads will depend on factors such as the number of views your videos receive and the type of ads that are shown.