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Concrete Footing Volume Calculator

Enter footing dimensions and count to find the concrete volume needed.

How it is calculated

Length, width and depth are entered in metres (so 60 cm is 0.6). The tool multiplies them for one footing: V = L × W × D in m³, then multiplies by the number of footings: total = V × count. It then converts to cubic yards with yd³ = m³ ÷ 0.764555. Results are shown to three decimals. All three dimensions must be above zero. If the count is left empty or is below 1 it is treated as 1, and a fractional count such as 2.7 is used as it is. The tool gives the exact geometric volume of a plain rectangular block: no waste allowance, overbreak, sloping sides or stepped sections are included, so add your own margin when ordering.

Worked example

Six pad footings, each 0.6 m long, 0.6 m wide and 0.4 m deep. One footing: 0.6 × 0.6 × 0.4 = 0.144 m³. Six footings: 0.144 × 6 = 0.864 m³. In cubic yards: 0.864 ÷ 0.764555 = 1.130 yd³. The tool shows 0.864 m³ in total, 1.130 yd³ and 0.144 m³ per footing, which is the number to compare with your drawing.

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Common mistakes

  • Entering dimensions in centimetres or inches. A 60 cm footing typed as 60 gives a volume 1,000,000 times too big. Divide centimetres by 100 first.
  • Using the tool for a continuous strip footing by entering the whole wall length once and then also a count above 1. For a strip, enter the total length once with count 1 (or leave it empty).
  • Ordering exactly the calculated volume. The result is the perfect-geometry figure; trenches are never exactly to size, so concrete suppliers are normally given a little extra.
  • Mixing up depth with the height of the footing above ground. Only the poured thickness counts here, so enter the full thickness of concrete in the hole.
  • Entering a count of 0 and expecting zero concrete. A count below 1 is treated as one footing, so the result is for a single footing.

About this calculator

A concrete footing is the below-grade base that spreads a structure's load into the soil, and its required concrete volume is simply Length × Width × Depth per footing, multiplied by the quantity of footings — the same rectangular-prism volume calculation used for any poured concrete element, converted to cubic yards or cubic meters for ordering ready-mix.

Contractors, concrete estimators and DIY builders use this calculation to order the right amount of ready-mix concrete for footings under a deck, fence posts, or a foundation wall, typically per dimensions specified in structural drawings or local building code minimums (footing depth is often set by the frost line in cold climates). Ordering slightly over the calculated volume — a waste allowance of 5–10% — is standard practice since footings are excavated by hand or machine and rarely come out perfectly to spec, and running short mid-pour means an unwanted cold joint.

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Comments (1)

  • Editorial team

    The tool treats every footing as a rectangular block, so a continuous strip footing is simply one long piece: enter its full run as the length, the strip's width, its depth and a count of 1. The default four 2 by 2 by 0.5 m pads give 8.000 m³, or 10.464 yd³. Dimensions are in metres, so 60 cm is 0.6. What kind of footings are you pouring?

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