Counting calories

So I'm doing pretty well with exercising. I'm doing at least one 30 minute walk every day and trying to add another walk/video most days. The one thing I have no idea about is how to figure out how many calories are in something that is homemade. I made chicken soup yesterday, but I have no idea how many calories are in a serving. I know some of you are great at keeping track of all of your calories, so I'm looking for some help from you. Is there a website or some other source you use to figure that out? Thanks in advance for your help!

Have a great weekend!