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The depletion of fossil fuel reserves is increasingly encouraging people see to other renewable energy sources. Strategic steps that can be taken is by applying the concept of energy diversification. One of the simplest and easiest ways to diversify energy is through biomass energy utilization. Indonesia has abundant biomass energy sources, which can come from waste. Potential waste that can be used as raw material for briquettes are sawdust and coconut shell waste. The purpose of this study was to determine the effect of variations in the adhesive concentration of starch on the characteristics of charcoal briquettes which include caloric value, moisture content, and ash content. The research are done with variating of adhesive concentration 4%, 6%, and 8% with sawdust and coconut shell composition 75%:25%. The research result shows that briquettes with 4% of adhesive concentration have caloric value 6974.022 cal/g, moisture content 4.518%, and ash content 1.364%. Briquettes with 6% of adhesive concentration have caloric value 7561.582 cal/g, moisture content 4.232%, and ash content 1.762%. Briquettes with 8% of adhesive concentration have caloric value 6996.102 cal/g, moisture content 4.455%, and ash content 1.623%. The characteristics of briquette have fulfilled the value of briquette quality standard SNI 01-6235-2000. The most optimum of adhesive concentration in briquette production from the research is 6%.