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Retaining Wall Footing Sizing Calculator

Get a rule-of-thumb footing width from wall height, then estimate the footing's concrete volume.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
32.81 ft4.92 ft
Schematic, drawn to the proportions you entered — not to scale on screen.
Who is doing the work?

Waste is set to 5% by hand. Pick a tier above to replace it, or keep your own figure.

Recommended footing volume

3.71 yd³

Check your inputs

The base width here is a preliminary rule-of-thumb, not a verified stability result — run the Retaining Wall Preliminary Stability Calculator with your actual soil data before finalizing dimensions.

Recommended footing width
2.95 ft
Base volume (no waste)
3.53 yd³

Running these inputs gives 2.83 m³ as the recommended footing volume. Base volume (no waste) carries the most weight in this calculation, at 2.70 m³. Note that footing length sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Rule-of-thumb preliminary footing sizing: base width = 0.4-0.8x the retained wall height (0.6x used as the default here) — a starting point only, not a substitute for the full stability check in the Retaining Wall Preliminary Stability Calculator

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Is the 0.6x ratio always correct?
No — it's a common starting point for preliminary sizing on decent soil with a modest wall height. Weak or clay soils, taller walls, or surcharge loads (like a driveway above the wall) typically need a wider base — verify with the Retaining Wall Preliminary Stability Calculator.
Does this account for the wall's stem, only the footing?
Footing only — see the Retaining Wall Block Calculator for the visible wall face material.