An experiment was conducted to study the effect of cow dung ash on the strength of concrete. Three percent (10%, 15%, 20%) cow dung ash by weight partially replaces cement in the M-20 grade concrete mix. Evaluation of concrete mix includes compressive strength and workability. The compressive strength of the concrete samples was measured on the 7th and 28th day, respectively. The testing was done on a mould with dimensions (150mm x150mm x150 mm). Performance measurement is done using the compaction factor Apparatus. Performance analysis shows that the performance of concrete decreases as the proportion of cow dung ash in the concrete mixture increases. Concrete containing 10% CDA showed a 17% increase in compressive strength compared to plain concrete. Compressive strength can be reduced after 10%. Therefore, good results can be achieved by replacing 10% cement with CDA. An experiment was conducted to study the effect of cow dung ash on the strength of concrete. Three percent (10%, 15%, 20%) cow dung ash by weight partially replaces cement in the M-20 grade concrete mix. Evaluation of concrete mix includes compressive strength and workability. The compressive strength of the concrete samples was measured on the 7th and 28th day, respectively. The testing was done on a mould with dimensions (150mm x150mm x 150mm). Performance measurement is done using the compaction factor tool. Performance analysis shows that the performance of concrete decreases as the proportion of cow dung ash in the concrete mixture increases. Concrete containing 10% CDA showed a 17% increase in compressive strength compared to plain concrete. Compressive strength can be reduced after 10%. Therefore, good results can be achieved by replacing 10% cement with CDA.