Structures

Retaining Wall Calculator — Blocks & Base

Estimate wall blocks, cap blocks, and base gravel. Your entries stay in your browser and are not sent anywhere.

Project measurements

Use consistent units and the product label or supplier figures where provided.

Before you buy

Practical measuring tips

  • Do not include buried-course decisions without checking the block system instructions.
  • Walls may require drainage, reinforcement, engineering, or permits.
  • Use manufacturer coverage data for tapered or interlocking blocks.

Formula

What the result includes

Rows and blocks per row are rounded up; base gravel comes from trench dimensions.

Whole-item results such as bags, rolls, blocks, and pallets are rounded up. Decimal volume or weight results remain estimates so you can compare bulk options.

Optional supplies

Compare project materials

Use your estimate to compare package coverage, delivery terms, and product instructions. This retailer search is not an affiliate link until a partner ID is configured.

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Common questions

Retaining Wall Calculator FAQ

Does this verify structural safety?

No. It is a material estimator, not an engineering design.

Are cap blocks included?

Yes. The estimate includes one cap course based on the entered block face length.