The present study deals with the estimation of above ground biomass and carbon stock of forest sites of Prayagraj by using field measurement method (destructive and non-destructive). Above ground biomass and carbon stock of trees were estimated by non-destructive method and allometric equation whereas destructive method used for shrubs and herbs. In this study maximum total above ground biomass recorded for the site ALD-1 (Koraon range) (27.84 t ha-1) and minimum for the site ALD-4 (Manda range) (8.50 t ha-1) and carbon stock was also maximum at the site ALD-1(Koraon range) (13.08 t ha-1) and minimum at the site ALD-4 (Manda range) (3.99 t ha-1). Basal area and tree density were also maximum at the site ALD- 1(Koraon range) and minimum at the site ALD-4 (Manda range). Trees stored maximum biomass hence trees sequestered maximum carbon and herb and litter layer sequestered minimum amount of carbon. Some external and internal factors affect the wealth of forests which affects the biomass and carbon stock. Study of above ground biomass and carbon stock provide data for forests of Prayagraj which can be use for further study.