A startup company represents a newly created form of company in the development phase, characterized by a high level of innovation, business riskiness and great agility in growth. This form of company was formed by the expansion of the technological revolution and is increasingly popular today, especially in the technological industries. For this reason, the question arises as to how founders come up with ideas for business, how they value ideas, what methods and tools they use in business, what are the key factors for starting a business, what problems they encounter, etc. The graduation thesis „Evaluation of entrepreneurial ideas – application in startup entrepreneurship“ is based on research and proving the importance of valuing entrepreneurial ideas through various approaches and using various methods and tools of valuing ideas in different stages of business that can be of crucial importance for startup companies. At the beginning of the work, the entrepreneurial process, approaches to evaluating entrepreneurial ideas, startup entrepreneurship and startup ecosystem were defined. Business plan, business model canvas, design thinking method, lean methodology help to a large extent when evaluating entrepreneurial ideas. After the theoretical part of the work, the results of the survey research and their interpretation are presented. Analyzing the respondents' answers, it is evident that the respondents combined various approaches, methods and tools in evaluating their own ideas, which will be shown in the rest of the paper.