Burning Test and Density Test are common to be applied in Coconut Shell Charcoal Briquette for stopping drying process and predict its quality. In order to understand the relation of both test and the quality of the briquette, a research on the burning test and density model was applied. Three different conditions of the briquettes were chosen, they are wet, half-dry, and dry. Mathematical models based on burning test of the charcoal briquette were developed. The results show that burning test can provide different conditions of coconut shell charcoal clearly. A dry briquette has fully exponential pattern of the left mass during 225 minutes combustion. The half-dry has combination of exponential, linear, and exponential pattern for respective times of 0 – 45’, 45 – 120’, and 120 – 225’. The wet briquette has similar patterns with shorter linear. The dry briquette can provide longer burning time than other.