Multiple Instances of Calculator

I have a question, even though it may appear to be somewhat random. I want to perform multiple calculations at once, something that I can't do with one instance of calculator open. I do not want to use the calculator widgets (as I don't always need to do these calculations). Is there a way to open multiple instances of calculator easily? Say open three calculator applications. Or is the only option with scripts (that's how I'm doing it now).