Enter the roof length (ft), the roof width (ft), and the density of roofing material (lb/ft^2) into the Roof Weight Calculator. The calculator will evaluate the Roof Weight.

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## Roof Weight Formula

The following formula is used to calculate the Roof Weight.

RW = RL * RW * RD

Variables:

- RW is the Roof Weight (lbs)
- RL is the roof length (ft)
- RW is the roof width (ft)
- RD is the density of roofing material (lb/ft^2)

To calculate the roof weight, multiply the roof length by the width, then multiply by the weight per unit area of material used.

## How to Calculate Roof Weight?

The following steps outline how to calculate the Roof Weight.

- First, determine the roof length (ft).
- Next, determine the roof width (ft).
- Next, determine the density of roofing material (lb/ft^2).
- Next, gather the formula from above = RW = RL * RW * RD.
- Finally, calculate the Roof Weight.
- 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.

roof length (ft) = 40

roof width (ft) = 50

density of roofing material (lb/ft^2) = 2.5

RW = RL * RW * RD =** ** ?