Tsarin CGS, ko tsarin centimita-gram-na biyu, tsarin raka'a ne da ake amfani da su a fannin kimiyyar lissafi da injiniyanci don auna adadin jiki kamar tsayi, taro, da lokaci. Yana dogara ne akan santimita (cm) tsawon, gram (g) don taro, da na biyu (s) don lokaci. A cikin wannan tsarin, ana auna ƙarfi a cikin dynes, ana auna makamashi a cikin ergs, kuma ana auna ƙarfin a cikin ergs a sakan daya. Tsarin CGS yanzu ya daina aiki kuma an maye gurbinsa da Tsarin Units na Duniya (SI), wanda ya dogara akan mita, kilogram, da na biyu.