精密計算機

コンクリートの平方フィート計算機

コンクリートの平方フィート計算機: Calculate surface area for concrete slabs, driveways, patios, and foundations. Cubic yards need a separate

部屋の寸法

材料廃棄物係数オプション

材料費の見積りオプション

Calculation Results
1 ft (12 in) 1 ft 1 ft² = 144 in²

Concrete Surface Area Calculator

Calculate the surface area of a slab, driveway, patio, or foundation. Concrete volume requires a separate depth calculation.

仕組み

1

形状の選択

Choose the shape that matches your space.

2

寸法を入力してください

測定値を任意の単位で入力します。数量、廃棄係数、材料価格を追加します。

3

結果を取得する

面積 (ft²、in²、yd²、m²、エーカー) とコスト見積もりをすべて一度に表示します。

よくある質問

Measure length and width of the pour area and multiply for surface area in square feet. For how much concrete to order, you also need slab thickness (depth).
Multiply area (sq ft) by thickness in feet, then divide by 27 for cubic yards. Example: 200 sq ft × 0.33 ft (4 inches) = 66 cu ft ÷ 27 = 2.44 cubic yards.
For 4-inch thickness, multiply sq ft by 0.0123 to get cubic yards. Example: 500 sq ft × 0.0123 = 6.15 cubic yards. Order 5 to 10% extra for waste, spillage, and uneven subgrade.
Add 5 to 10%. Use 5% on flat, well-prepared ground. Use 10% or more on uneven terrain, complex forms, or lots of edges. Running short mid-pour is worse than a little extra.
Calculate area, add waste, then enter price per square foot in Estimate Material Cost. Ready-mix concrete often runs $100 to $150 per cubic yard delivered. For cost per sq ft, divide total cost by area.
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