Rechner für Volumen und Menge der Betonmischung
Führung
Rechner für Volumen und Menge der Betonmischung
Calculate the exact volume of concrete you need for slabs, columns, and footings, plus the number of 40, 60, or 80-pound (or 20, 25, 30-kilogram) premix bags required to fill it. Switch between metric and imperial units, add a wastage allowance for spillage and uneven subgrade, and see your pour in cubic meters, cubic feet, and cubic yards — along with the total weight of the finished concrete.
Nutzung
- Pick your pour shape: rectangular slab, square column, cylindrical column, tube footing, or circular slab.
- Choose the length unit you want to enter dimensions in — meters, centimeters, millimeters, inches, or feet.
- Type the dimensions that appear for that shape (for example, length, width, and thickness for a slab).
- If you are pouring multiple identical pieces, increase the “Number of Pours” field.
- Select the premix bag size you plan to buy and adjust the wastage slider (5–10% is typical).
- The result table updates as you type: net volume, total volume including wastage, weight, and the number of bags needed.
Funktionen
- Five common shapes – Rectangular slab, square column, cylindrical column, tube footing, and circular slab, each with its own dimension inputs.
- Metric and imperial input – Enter dimensions in meters, centimeters, millimeters, inches, or feet without doing any conversion yourself.
- Bag count for major bag sizes – 40, 60, and 80-pound and 20, 25, and 30-kilogram premix bags, using each manufacturer’s published yield.
- Wastage slider – Add 0–25% extra to cover spillage, over-excavation, and uneven forms in one click.
- Multi-piece quantity – Multiply a single shape by however many identical pours you need.
- Three volume units side by side – Cubic meters, cubic feet, and cubic yards, plus total concrete weight in kilograms and pounds.
- Live results, no submit button – The output table refreshes as you change inputs, so you can compare options instantly.
Häufig gestellte Fragen
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How is concrete volume calculated for different shapes?
Concrete volume is the geometric volume of the empty form: length × width × thickness for rectangular slabs, side² × height for square columns, π × radius² × height for cylinders, and π × radius² × thickness for circular slabs. All dimensions must use the same unit before multiplying, so converting everything to meters first is the safest way to avoid mistakes.
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Why is wastage important when buying ready-mix concrete?
Even on a well-prepared subgrade, some concrete is always lost to spillage, over-excavation, uneven forms, and material left in the mixer or wheelbarrow. A 5–10% wastage allowance is the industry default for slabs and footings, and larger pours or rougher excavations may need 15% or more. Ordering exactly the calculated net volume usually leaves you short.
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How many premix bags equal one cubic yard of concrete?
Yield is roughly 60 × 80-lb bags per cubic yard, 90 × 60-lb bags per cubic yard, or 133 × 40-lb bags per cubic yard. Metric equivalents are about 60 × 30-kg bags, 72 × 25-kg bags, or 90 × 20-kg bags per cubic yard. These figures assume the manufacturer's published yield with normal mixing; thinner mixes will produce less finished concrete per bag.
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What density is used to convert concrete volume to weight?
Standard normal-weight concrete has a density of about 2,400 kg/m³ (150 lb/ft³). Lightweight aggregate concretes can drop as low as 1,400–1,800 kg/m³, and high-density radiation-shielding concretes can exceed 3,500 kg/m³. The default 2,400 kg/m³ figure is correct for the vast majority of residential and small commercial pours.
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