Enter the total roof area (ft^2) and the waste percentage (%) into the Calculator. The calculator will evaluate the Roof Waste.

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## Roof Waste Formula

RW = RA * WP/100

Variables:

- RW is the Roof Waste (ft^2)
- RA is the total roof area (ft^2)
- WP is the waste percentage (%)

To calculate Roof Waste, multiply the total roof area by the waste percentage over 100. Typically, there is approximately 10-15% waste on roof jobs.

## How to Calculate Roof Waste?

The following steps outline how to calculate the Roof Waste.

- First, determine the total roof area (ft^2).
- Next, determine the waste percentage (%).
- Next, gather the formula from above = RW = RA * WP/100.
- Finally, calculate the Roof Waste.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

total roof area (ft^2) = 500

waste percentage (%) = 12.5