The amount you add to the cost of the services you provide to make a profit is known as your markup. Typically, markup is expressed as a percentage.
The formula to calculate your markup percentage: profit/cost*100 (profit divided by cost and then multiplied by 100).
The markup percentage you wish to add to the break-even rate will be determined by the profit margin you want to achieve. That will tell you how much sales you can expect to make from this business.
The formula to calculate your profit margin: profit/sales*100 (Profit divided by sales and then multiplied by 100).
A typical rule of thumb for pricing roofing jobs is to strive for a profit margin more than the industry average of 6 percent.