Simple risk calculator calculates a set of risk measures, such as VaR, CVaR, dispersions, and risk\reward ratios. The calculator is useful for decision making, risk engineering, risk measurement, and risk management tasks. Simple risk calculator calculates a set of risk measures, such as VaR, CVaR, dispersions, and risk\reward ratios. The calculator is useful for decision making, risk engineering, risk measurement, and risk management tasks.