It looks very much like every other "how much is my site worth" site out there. What makes yours different? Do you calculate the value differently or do you make all the same mistakes that the other sites make?
The look & feel your website is simple but good. You have also taken care about the OnPage SEO. Please add the "sitemap.xml" file and that can weaken your SEO.
Thanks for your suggestions. I have used algorithms to give results more accurately. Its not like other sites which give inaccurate results.
When you say more accurately, do you analyse recent sales and compare your value with what the site actually sold for? or do you have some other measure of accuracy?