When the coal is heated, conversion process starting with moisture loss passes through pyrolysis, burning and gasification processes depending on the atmosphere, temperature rise rates, final temperature and other parameters. Since coal has a heterogeneous structure, interpretation of these phases is difficult. Thermogravimetric analysis, on the other hand, has a wide range of applications and allows valid approaches to the physical and chemical properties of coal. Therefore, the thermogravimetric analysis makes it possible to analyze the characteristics of the coal gasification phase in a practical and rapid manner.In this study, the gasification characteristics of coal samples taken from Ilgn, Ermenek and Zonguldak regions in Turkey were determined. Conversion time and gasification rates of Ilgn and Ermenek coals were investigated using thermogravimetric analyzer at 700 degrees C, 750 degrees C, 800 degrees C and 850 degrees C in CO2 atmosphere and comparisons were made between samples. In addition, conversion and gasification rates of coal samples taken from Zonguldak region at 1150 degrees C were investigated. It was observed that the conversion time of the Ilgn coal at 800 degrees C and the Ermenek coal at 850 degrees C was shorter than the other temperatures. When the 80% conversion rates of Ilgn coal at 800 degrees C, Ermenek coal at 850 degrees C, and Zonguldak at 1150 degrees C, are compared; it is observed that there exist a 1,2 min difference between Ilgn-Zonguldak, 1,05 min between Ilgn-Ermenek and 1,96 min between Ermenek and Zonguldak coals.