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I don't really think it's possible to calculate. A multiplier for one keyword will be different to another. I don't the nk there is an average figure that anyone could calculate with any degree. Peter

Thank you Bradley. I've managed to reduce my menu today to just 1 sub category per main category and it's brought the links down a lot - I'm going to see what other links I can reduce as well. I've actually got a blog (rpamx.co.uk/blog) that I will be posting regular content onto to try and drive more traffic. The blog is wordpress, I hardly use the magento cms. If you have further experience to share with magento I'm sure it will be of benefit to us all. thankyou so much for replying.