It seems there is only one good ink coverage calculator on the internet which is Apfill Ink Coverage Calculator from www.avpsoft.com. If you are a professional printer then you need the pro version which calculates cmyk coverage. If you add the total percentage of cmyk, you get the total ink coverage in percentage with respect to the paper size. It is very easy and convenient. The pro version costs around 99 dollars. It is helpful when you have to give competitive rates without suffering loss.
Ink Coverage Calculator
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We have a product called PrintCALC that reports on the CMYK coverage of PDF.
Its available here: http://printcalc.net
Its a free service that replaces our paid-for PC desktop version.