The return and variance calculator lists the chances of a getting a bonus and having a positive return. You may utilize this calculator to retain help in selecting the size of your bet or to determine the results with normal expectations. The inputs required for the return and variance calculator are the bonus, bet size, wagering and selection. After choosing the values, select “Calculate” to see your results. You may also use a modified calculator which gives an estimate for hours of play along with the data for return and variance. See the instructions section for more information about the calculator operation.