Different calcium sources influence the production performance of the broiler chicken. The study was conducted to use shell-based calcium carbonate as a feed additive in broiler ration to increase broiler production. A total of 99 unsexed Day Old Chick (DOC) broiler was divided into three dietary treatment (T) groups, 33 chicks per group or treatment. They are established as Control (Commercial broiler feed), T₁ (Commercial broiler feed and 1gm/bird/day seashell-based powder), and T₂ (Commercial broiler feed and 1gm/bird/day commercial calcium carbonate powder). The three groups of chicks were reared separately in the cage of an open-sided housing condition. Each group was fed ad libitum on feed and water. The weight was measured on the 1^st, 9^th, 15^th, 20^th, 24^th, 32^nd, and 35^th day of age of the birds. The final mean body weight (gm) of the broiler in the dietary control, T1 and T2 were 2156.0±197.9, 2302.9± 224.4, and 2195.24± 330.2 respectively. The T1 group of broilers had the highest body weight, while the control group had the lowest. However, the final live weight of the broiler-fed seashell-based diet (T1) was significantly higher (P<0.05) compared with the control group. The live weight of the T1 dietary group of birds on the 9^th day (P<0.05), 16^th (P<0.05), and 32^nd (P<0.001) was significantly higher than the control group. The body weight in the commercial calcium carbonate supplement group was apparently improved, compared to the control group throughout the experiment period, but statistically insignificant (P>0.05). It can be concluded that seashell powder 1gm/bird/day of feed was better concerning the growth performance, and profitability of broiler production. Seashell-based calcium carbonate was a potential calcium source for poultry as a feed additive.