Research has consolidated on the knowledge of gas emission characteristics of coal mine goaf in Australia into a form which enables emission predictions to be made using limited input data. The fundamental principles are encapsulated within the coal mine goaf gas predictor (CMGGP) professional engineering software. This easy to use tool is designed to predict the decline of methane emissions and calculate gas reservoir capacity of underground coal mine goaf. The method for estimating abandoned coal mine and goaf area methane potential is applicable to both dry and flooded mines and also takes into account coal mine methane utilisation options. The software will run on a PC with windows XP or vista operating system and can be used by individual specialists, coal mines and/or other institutions involved in coal mine closure, coal mine methane utilisation and greenhouse gas emissions reduction.