Abstract: Supplementary cementitious materials (SCMs) have been widely used all over the world in concrete due to their economic and environmental benefits; hence, they have drawn much attention in recent years.Mineral admixtures such as fly ash, rice husk ash, silica fume etc are more commonly used SCMs. They help in obtaining both higher performance and economy. Metakaolin is also one of such non - conventional material which can be utilized beneficially in the construction industry. This paper presents the results of an experimental investigations carried out to find the suitability of metakaolin in production of concrete. In the present work, the results of a study carried out to investigate the effects of Metakaolin on strength of concrete are presented. The referral concrete M30 was made using 53 grade OPC and the other mixes were prepared by replacing part of OPC with Metakaolin. The replacement levels were 5%, 10%, 15% upto 20%(by weight) for Metakaolin. The various results which indicate the effect of replacement of cement by metakalion on concrete are presented in this paper to draw useful conclusions. The results were compared with reference mix. Test results indicate that use of replacement cement by metakalion in concrete has improved performance of concrete up to 15%.