Hi Luke
I wouldn't particularly worry about the actual keyword density of the page but more about whether your keyword optimized text actually looks natural and not stuffed with a set keyword. In regards to meta data this doesn't have an direct value in relation to your search engine ranking. I personally don't use meta tags as this tells my competition exactly what keywords I am going after. As far as meta description goes this is important because it influences what text is displayed against your page in the search engine results. Good meta descriptions can help influence whether people click through to your site from the SERPs. Hope this helps.
Keyword density is so old hat - if I were you I would stop measuring your pages by keyword density and make sure that you right decent content that contains your keyword. Also placing your keywords in important elements such as the title tags, H1 header, etc. In direct answer to your question if you insist on measuring keyword density meta data won't count as it is not a ranking factor - the days of meta crawlers are long gone!