# Mass Conversion in Metric (SI) & US Customary (USC) Units

getcalc.com's Mass Units Converter is an online tool to execute measurement units conversions in Metric (SI) & US Customary (USC) number system. The metric (SI) units of kilograms, grams, milli-grams & metric tons and the US Customary units of pounds, ounce & stones used to measure the mass. By using this converter, any mass measurement unit can be converted with in the units of US customary or metric system, or from metric to US customary units and vice versa.