Backyard Numbers provides calculators and guides for general planning only. Results are estimates based on typical material properties and the measurements you enter.
We don't guarantee that results are accurate for your project. Before you order materials or start building, confirm quantities with your supplier and follow the manufacturer's instructions and local building codes. Structural projects such as tall retaining walls should be designed by a qualified professional.
We're not liable for any loss arising from use of this site. Content may change at any time.