siteprice.org is a detailed
domain worth calculator and domain appraisal tool.
Calculation a
domain worth is not an easy task and there is no way to estimate %100 correctly.
siteprice.org algorithm tries to calculate
worth of a domain with gathering,
collecting and analyzing data from several internet resources.
Domain worth calculation differes from website worth calculation if there is no website under the domain name.
So domain name worth calculation are mostly based on whois data(domain age), google pagerank, soical media visilibity and backlinks.
Check
website worth calculator topic for more information.