Risk estimation is a process executed on the basis of risk analysis. Based on the risk estimation an idea of the extent, i.e. severity of the risk is made. In risk estimation we work with two basic components. These are the probability of the negative effect of the risk (P) and rate of consequences caused during exposure to the risk (C). To estimate the risk, we use processed methodology. It is appropriate to include into estimation of the level of risk also the number of persons that may be endangered by the risk, relationship to other risks, environmental and material damages that may arise from the effects of risk and other possible factors, according to specific conditions in the company. During estimation we work with statistically obtained data and empirical data.