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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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Keep all three dimensions in metres so the result is m³ of concrete. A 4 m × 3 m slab 0.15 m thick is 1.8 m³. Convert to bags using the yield your mix or supplier quotes — that factor is not baked in. For the hole you excavate before the pour, use the excavation calculator; soil volume and concrete volume are not interchangeable once sides slope or you add wastage.
The result is a cuboid: length × width × depth. Sloped footings and stepped rafts must be split into rectangles and added. Reinforcement, shuttering, pump-line waste, and bag yield are not fields. This is not soil to cart away — dug earth bulks, which the excavation page warns about separately.
It does not convert to bags, deduct steel, model sloped sides, or price the pour — and it never substitutes for the excavation figure, which measures a hole plus bulking, not a placement.
Cuboid pours only — steel, bags, and sloped sides are separate.
No. It is the cuboid volume of the pour. Reinforcement, shuttering, and pump wastage are separate estimates.
Multiply by the bag-yield your mix design or supplier quotes for the grade you are pouring — factors vary, so they are not baked in here.
Yes — a small margin (typically a few percent) covers shuttering gaps, spillage, and pump-line loss. Order exact volume plus that buffer.
No. They stay in the browser tab.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.