Calculating percentages is a relatively simple task, but it requires some concentration and a good understanding of the figures you are trying to compare. When calculating percent delay, you must know the planned length of time for a task to be completed and the actual length of time it took. By analyzing the status of your project, you can correct any problems before they too far out of control.
Write down the planned amount of time it should taken to complete a certain task. For example, you may have planned that it would take seven days for your business's merchandise to be transported from a warehouse to a retail outlet location.
Write down the actual amount of time it took to complete the task. For example, it may have taken nine days for your merchandise to reach the retail outlet from the warehouse.
Subtract the planned amount of time it took to complete the task from the actual amount of time. In the merchandise example, you would subtract seven days from nine days, giving you a result of two days. This figure is the amount of the delay.
Divide the amount of the delay by the planned amount of time for the task to be completed. In the merchandise example, you would divide two days by seven days, which is about a 29 percent delay.