A conversion chart for the metric system can be found at ScienceMadeSimple.com. The website also offers a metric conversion calculator for many common units such as area, speed, distance, volume and weight.
ScienceMadeSimple.com provides both conversion charts for standard units (U.S. customary) to SI units (metric), and SI units to standard units. Each multiplier is listed to a three-digit approximation. Units and unit abbreviations are included on each chart.
The conversion calculator provided on the site allows the user to specify the units they are starting in and the units they are looking for. It offers a large number of unit options in several different conversion categories. The site also allows the user to select how many decimal places to return when it converts the measurement.