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Fileraz
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Fileraz
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Construction Calculator
Rule-of-thumb site math, reviewed October 2026 — first-pass material estimates, not a bill of quantities or a code check. Confirm with your contractor or engineer.
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The result is a cuboid: length × width × depth in metres. Trenches with sloped sides hold more than a vertical-sided box of the same bottom size — break those into parts. Once dug, soil typically occupies more volume than the in-situ hole (bulking); this tool does not apply a bulking percentage. For the concrete that later fills a footing, use the concrete calculator.
The figure is earth still in the ground. After digging, soil typically occupies more truck volume; this page does not apply a bulking percentage. Working space beyond the footing is not added. Convert to truck loads with the factor your hauler uses — it is not baked in.
It does not apply bulking, add working space, or book trucks — and it never doubles as the concrete figure, which is the exact pour placed inside the hole.
In-situ volume — bulking, working space, and trucking excluded.
Only if the pour is a perfect cuboid matching the hole and you ignore bulking and working space. In practice the dig is larger than the structural concrete — estimate them separately.
Divide the m³ (plus your bulking allowance) by the truck's per-trip capacity — your hauler's factor, which varies by vehicle and soil type.
Dug soil typically occupies around 20–30% more volume than in the ground — multiply the in-situ m³ by roughly 1.2–1.3 as a carting allowance, then confirm with your hauler.
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