Calculating percentage change can be tricky so we have created this easy to use calculator which allows the user to get the answers to several percentage change scenarios quickly, easily and accurately. The trick with percentage change calculation is to remember that the formula is based on the variance from the original figure which is this case is named “old”. The formula is ((new – old)/old)*100). This calculator can be used for both business and personal use as it reports back to two decimal places which is standard in corporate reporting.