Profitable animal production depends on so many factors and feeding is most important among them as feeding cost is responsible for 60% cost of animal production. Feeding of animal economically requires proper feed formulation according to animal requirement considering their age, sex and stage of production. In conventional animal production system, farmers are not conscious enough about their animal requirement, available feed sources and their nutritive values as information regarding these issues are scattered. So, approach has been taken to give a complete package to the farmers as well as stakeholder to feed their animals in proper way. Considering these facts the present study has been designed to fulfill the following objectives: 1) Develop a complete software package for feeding buffaloes that is more farmers and extension worker friendly. 2) Help the farmers and extension worker to formulate a ration by using minimum feed ingredients more accurately and conveniently. 3) Give an idea to the farmer and extension worker for year round fodder production planning and budgeting. 4) Calculate cattle weight instantly. 5) Digitalize livestock sector to fulfill vision 2021. Feed master is an android application that can easily be installed in android device which can formulate ration instantly according to thumb rule. Formulation of ration and feeding to animal is done on the basis of DMI of animal considering their body weight. Studies indicated that daily DMI of buffalo for maintenance was 1.6-2.4% and it was 2.2-2.6% of BW in heifers, 2.5-3.0% of BW in fattening buffaloes, 2.2% of BW in breeding males, 1.99% of BW in castrated indigenous young males. In pregnant buffaloes DMI starts to drop before parturition and levels up 1.8-2.5% of BW. DMI for buffaloes at lactation period 2.0-2.2% of BW have been found. Average DM intake is fixed at 2.5 % of body weight. Among total DM requirement 1/3 portion is fulfill by concentrate and 2/3 portion of DM is fulfill by roughages. Animal weight is measured in two ways (Weighing balance and measuring tape). Total animals are divided into two groups: One group consists of growing and bull where no supplement is provided and another group consists of dry, Pregnant and milking animals where supplement feed is provided. The ration of bull and growing animals consists of maize crush, wheat bran, rice polish, khesary bran, soybean meal, salt, di-calcium phosphate and lime stone in a ratio of 25, 20, 15, 20, 17, 1, 1.5 and 0.5 percent respectively which can supply about 19.6% CP and 11.11 MJME/kg DM. The Dry, Pregnant and milking animal ration contain maize crush, wheat bran, rice polish, khesary bran, soybean meal, salt, di- calcium phosphate and lime stone in a ratio of 30, 20, 20, 15,12,1,1.5 and 0.5 percent respectively which supply 17.22 % CP and 11. 67 MJME/kg DM. Milk producing animals are grouped into 5 categories according to their milk production and supplemented concentrate is calculated on the basis of their extend of production by using formulas: Concentrate for less than 5 litters milk production = 0.5+0.7 X milk production( L ), Concentrate for less than 8 litters milk production = 0.7+0.4X milk production( L ), Concentrate for less than 12 litters milk production = 2.0+0.4X milk production( L ) , Concentrate for less than 15 litters milk production = 3.0+0.3X milk production( L ) , Concentrate for less than 20 litters milk production = 3.0+0.3X milk production( L ). In case of pregnant (over 6 months) animal average 1.5 kg concentrate supplement is provided. Roughages requirement is fulfilled by different types of seasonal (Maize, Jamboo, Oat and Dhincha) and perennial (German and Napier) fodder according to their DM contain. Land requirement, Seed/cutting, Urea, TSP, MOP, Cow dung requirement is calculated according to farm practices. Supply of year round fodder to the animal is planned according to season and availability of the fodder. Animal weight in measuring tape is calculated by using formula {(Animal length in inch) x (Animal heart girth length in inch)2 }/660). Animal length is the distance between the point-of-shoulder and the point-of-rump or pin bone. Animal heart girth is measured from a point slightly behind the shoulder blade, down the fore-ribs and under the body behind the elbow all the way around. A feeding trial will be performed to judge the efficacy 0f this software in the next year. It is written in Bengali using farmer friendly terminology which is less expensive and convenient than computer. It has been programmed to calculate ration according to the age, sex, production and reproductive stage of animals. So by using this software a farmer and extension worker can easily formulate ration for their buffaloes without any error. This application also give a plan to the farmer and extension worker how to manage year round fodder production and how much land require for fulfilling their animal requirement if the farmer want to cultivate fodder. It also calculates animal weight instantly which is helpful for drag administration and animal marketing. In next version this apps will formulate least cost nutritionally balanced ration which will give option to the farmer to select available feed ingredient. Reproductive cycle and vaccination alarming system will be added in the next version.