Lowes Timber Retaining Wall Calculator

Lowes timber retaining walls are a cost-effective and aesthetically pleasing solution for managing soil erosion and creating functional outdoor spaces. Our calculator helps you plan your project with precision.

1. Enter the desired length and height of your retaining wall.
2. Select the timber size you prefer.
3. Click ‘Calculate’ to see your results.

The calculator uses the following formula to estimate the number of timber posts needed:

Posts = (Length * Height) / (Post Spacing * Timber Size)

It also estimates the total linear footage of timber required.

Comparison of Timber Sizes

Timber Size	Post Spacing (ft)	Posts per ft of Wall
4×4	4	0.25
6×6	6	0.17
8×8	8	0.13

• Always check local building codes and obtain necessary permits before starting your project.
• Consider using gravel backfill to improve drainage and reduce pressure on the wall.
• For walls taller than 4 feet, consider using a professional installer.

What is the maximum height for a timber retaining wall?

Without additional reinforcement, timber retaining walls should not exceed 4 feet in height.

For more information, see the Purdue University Extension and the Federal Highway Administration.