First:[/b] don't i use half of 4.184 because, i start in ice?
No you don't. Were you taught that, or did you read that somewhere?
Also, I really do not recommend using an online conversion tool unless you can convert the units by hand first. Almost all work in chemistry requires being able to convert units, or use dimensional analysis (which is what you can use to convert units). If you are not comfortable with those techniques it is going to make your life only harder later on (even later in the semester).