For fabricating a low cost anaerobic digester an empty pesticide drum having a volume of 300 gallons (1136 l) was used as an anaer- obic digester and an empty plastic container was employed for the collection of biogas. A series of these digesters may be employed in a slaughterhouse for the treatment of the waste. The mesophilic temperature conditions are maintained most of the time, in Pakistan, during a year. So, there is no need of artificially adjusting the tem- perature. The number of these digesters and the total cost for the system was calculated for the Fakirabad slaughterhouse in Peshawar, Pakistan. The total volume of waste produced daily in the Fakirabad slaughterhouse is approximately 2041 l. The hydraulic retention time selected was 5 days. So, the total digesters required are 12. Gravel