Instant SROI calculates the Return on Investment (ROI) and Social Return on Investment (SROI) in an expert-system basis with statistics derived from quantitative analysis in economics and artificial neural networks. It makes the complex calculation of the returns easier for researchers, evaluators and officers who needs to know the impact of projects or programs both based on evidences (ex-post evaluation) and forecast (ex-ante evaluation). It simplifies the calculation to ease the users to understand the SROI's main idea, major components and critical settings of assumptions. It uses valid financial proxies in the right context of evaluation. It is beneficial for researchers who need to propose the ex-ante impact of their works or projects in their research proposal. It is also helpful for funding agencies to validate and verify the SROI calculation appeared in the submitted proposals from researchers. It is essential for ex-post evaluators to make sure that their evaluation covers all the critical parts and shows the real impacts to ensure the true accountability of national budget and investment