In an increasingly globalizing poker world, the usage of supportive tools like poker calculator apps has become a popular leisure sports trend in Vietnam. A poker calculator gives you an exact chance of winning, which is calculated based on the cards revealed and that would be revealed. This way, decisions taken during a poker game can become more just. Thus, the usage of poker calculator apps in Vietnam has several advantages. On the one hand, it helps to improve the skills and overall play of poker. On the other hand, it leads to a higher probability of winning in the game and the tournament. Due to the fact that, people who have just started playing poker find it difficult to analyze different types of situations, this tool is really beneficial. A poker calculator app includes functions like calculating the winning probability, predicting the appearance chance of necessary cards, and optimizing play strategies. That is why more and more poker subscribers in Vietnam search for the apps and make use of them. It can be concluded, that in connection with the rapid digital technology, poker calculator app has helped players in Vietnam to increase enjoyment in the game and victory. This is truly an indispensable tool for those, who like modern poker.