I agree. There used to be a really good backspace calculator on the inter-webs but as of the past few years I have not been able to find it however this one looks pretty good. Wheel Smith has a worksheet that I have used to order from them which also does the same thing. I'm not discrediting any of the suggestions given to you on your question but there is nothing quite as good as being able to compare all the possible options at your fingertips.
