コンクリートスラブ計算機

共有リンク

はじめに

Concrete Slab Calculator — Volume, cubic yards & 40kg bags for a concrete slab. Enter Length (m), Width (m), Thickness (m), Waste (%) to get an instant, accurate result.

計算式

Volume = length × width × thickness, plus a waste percentage allowance. Result is also shown in cubic yards (× 1.30795) and as 40 kg bags needed, assuming ~2,500 kg/m³ concrete density.

ステップごとの説明

Enter the Length (m).
Enter the Width (m).
Enter the Thickness (m).
Enter the Waste (%).
Click Calculate to see your result instantly.

実例

Example: With Length (m) = 5, Width (m) = 4, Thickness (m) = 0.1, Waste (%) = 10, the Concrete Slab Calculator gives Volume M3: 2.2, Volume Without Waste M3: 2, Volume Cubic Yards: 2.8775.

よくある質問

What thickness should I use for a slab?

Typical residential slabs run 4 in (0.10 m) for patios/sheds and 5-6 in (0.125-0.15 m) for driveways carrying vehicle loads.

Why does the result show both m³ and cubic yards?

Ready-mix concrete is priced by the cubic yard in the US and by the cubic meter elsewhere, so both are provided for ordering convenience.

What inputs does the Concrete Slab Calculator need?

You'll need to provide: Length (m), Width (m), Thickness (m), Waste (%). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Concrete Slab Calculator?

The Concrete Slab Calculator applies the formula exactly as calculated — Volume = length × width × thickness, plus a waste percentage allowance. Result is also shown in cubic yards (× 1.30795) and as 40 kg bags needed, assuming ~2,500 kg/m³ concrete density. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Concrete Slab Calculator free to use?

Yes, the Concrete Slab Calculator is completely free, requires no signup, and runs instantly in your browser.