Simetric.co.
uk is a site that provides you with over 1000 factors on metric conversions. The site is organized in different categories such as related pages: info on SI units, SI unit descriptions, SI derived units, SI prefixes, Imperial / UK units, scientific notation; detail pages: feet to metres calculator, metres to feet calculator, british thermal units btu, density of bulk materials, density of liquids, specific gravity of water, density of metals, density of woods, kitchen metric, medical metric, parts per million-ppm, clothing metric, yarn metric, time, cc to hp, paper & envelopes, gross to nett price, nett to gross price, add on commission, sheet metal swg-mm, wire & rod swg-awg, electrical wire swg-awg, steam tables, watts, amps, volts, ohms, m threads & spanners, self tapping screws and m tap & pilot drill sizes. Also you can download a unit conversion tool. So if you want to get the best information on metric conversions then you should check out this site. 
