How many ad accounts can I have in Business Manager

There are limits to how many ad accounts you can use and how many people can use an ad account. You can manage up to 25 ad accounts. An ad account can have up to 25 associated admins, advertisers or analysts.

You need a Facebook profile to create a Business Manager account. You use your Facebook username and password to sign in to Business Manager. It's a more secure way to log in than with just an email address and password. You can only create two Business Manager accounts.

You can only own one ad account, and you can be admin of up to 25, but only five can be added to business manager.