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Prices, promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

From Known Rise and Run

This Calculator should be used as an estimating tool ONLY.

  • After entering the dimensions of the roof, click on "Calculate" and the calculator will provide you with the length of the rafter.

  • ft in
  • ft in

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