The developed thermoanalytical method for WPC shows that it is possible to quantify the mass percentage for wood flour and polypropylene copolymer in wood plastic composites (WPC) by using thermogravimetric analysis (TGA–DTG). The developed method shows good agreements between analyzed and actual frac- tions of wood flour and polymer in spite of the complex thermal degradation behavior of wood plastic composites. The TGA method can be tailored according to the formulation composition. Maxima deviations from the actual wood and polymer contents were 5.4% and 14.3%, respectively. It is possible to optimize the deviation of analyzed fraction by switching the isothermal step between 340 and 350◦C, changing the heating rate and adjusting the isother- mal period. An accurate determination of individual components in WPC by using TGA is limitedly possible, because of the wide range of continuous thermal degradation of wood between 200 and 700◦C in nitrogen and oxygen and the various thermal decomposition pat- terns of polymers. WPC with known composition can be rapidly quantified with TGA measurements, therefore, TGA is a useful tool for WPC production control. TGA measurements of WPC with unknown composition are difficult to interpret. For determination of composition of WPC with unknown formulation, other analyti- cal methods such as Soxhlet extraction, infrared spectroscopy and DSC in combination should be used.