The Hevea rubber tree is a natural alternative to other timber species to meet the shortfall in future supply of timber arising from the reduced rate of felling timber species. There are many advantages of rubberwood. One is that it has the property and versatility for a wide range of end-uses, secondly it is readily available. There were 1.78 million ha under rubber planting in 1993. Thirdly it is a renewable resource, continuously available through replanting. However, there are two major complaints against the use of rubberwood and thes are uneven distribution and inconsistency of supply. This study gives an estimated projection on the potential availability of rubberwood from both the estate and the smallholding secotrs based on the planted clonal and seedling materials. The availability of usable logs and sawntimber are also discussed. In this study the total wood potentially available between 1996 and 2018, in estates and smallholdings, is-estimated based on the clonal and seedling materials used and the area planted. It varies from 2.8 million m3 in 2010 to 9.2 million m3 in 1998. The average wood yield per ha in estates was 172 m3 based on materials planted in 1974 and earlier. This average increased to 180 m3/ha based on 1975-1993 plantings when more vigorous planting materials were used. In future this average is expected to increase with the replacement of the average wood yielding RRIM 600, GT 1, PR 255, PR 261 and RRIM 712 by many of the higher wood yielding RRIM 900 and RRIM 2000 series clones. The states with the largest area under rubber namely Johor, Kedah and Negri Sembilan would have the potential of rubberwood supply. The sustainability of rubberwood supply is crucial to the viability and future development of the rubberwood industry. Measures that need to be taken to ensure continuous supply are also briefly discussed.