Does the money that I owe in student loans factor into my credit score?

I am trying to manage my credit better and I have read on here that it's best to use less than 30% of your total credit allowance, or else your credit score might drop. When figuring out how much of my credit allowance I am using, do I factor in how much I owe on my student loans as well? What about a car loan that I am a secondary signer on? Does that go on my credit score as well? Thanks!