If you need an estimate of the portion of revenue that you will require to cover the fixed costs of your business, then you are in the right place. It is a calculator that will help you calculate the contribution margin, provided you have some of the data on the popout selling price per unit, the variable cost per unit, and the number of units in production. You can also use the calculator for the contribution margin ratio, which can be very useful to understand how profitable the business you are doing is. Many world leaders pay attention to the profit margin, which aims to measure how income exceeds the level of realized costs.