Many previous leather carbon footprint studies didn’t consider the thickness of the finished bovine leather as an influencing factor in the life cycle GHG emission assessments. In order to assist the industry in assigning the GHG emissions as a coefficient to the finished leather, the declared unit in this study is then determined to be expressed in kgCO2 equivalent per m2 of finished bovine leather. Furthermore, to evaluate whether the thickness of finished leather is a true influencing factor in the GHG emissions assessments, As seen from the results, the thickness of finished leather is a true influencing factor in GHG emissions assessments especially in the raw material extraction stage. Furthermore, these results lay the groundwork for future CFP studies of not only tannery houses but also supply chains in the leather industry in Asia to raise awareness of considering and developing prospects in reducing GHG emissions.