Betonrechner
Berechnen Sie den Kubikmeterbedarf an Beton sowie die Anzahl an Fertigmischsäcken für Terrassenplatten und Punktfundamente.
Projektmaße
Geben Sie Ihre Maße ein, um den genauen Materialbedarf zu berechnen
Geben Sie oben Maße ein, um Ergebnisse zu sehen.
Schritt-für-Schritt Beispielrechnung
Beispiel: Pouring a 10 ft × 10 ft concrete patio slab that is 4 inches thick with a 10% safety buffer.
Convert 4" thickness to feet: 4 ÷ 12 = 0.333 ft.
Calculate Net Volume: 10 ft × 10 ft × 0.333 ft = 33.33 cu ft.
Add 10% Safety Buffer: 33.33 × 1.10 = 36.67 cu ft.
Convert to Cubic Yards: 36.67 ÷ 27 = 1.36 cubic yards.
Calculate 80 lb Bags: 36.67 cu ft ÷ 0.60 cu ft/bag = 61.1 -> 62 bags.
Concrete Slab Volume Formula
Cubic Yards = (Length [ft] × Width [ft] × Thickness [in ÷ 12]) ÷ 27 × (1 + Waste %) Multiply Length by Width by Thickness (converted to feet) to find volume in cubic feet. Divide cubic feet by 27 to obtain Cubic Yards. Add a 10% buffer to compensate for uneven ground and formwork deflection.
Formelvariablen
Berechnungsgrundlagen
- One cubic yard equals 27 cubic feet (0.7645 m³).
- An 80 lb bag yields 0.60 cu ft; a 60 lb bag yields 0.45 cu ft; a 40 lb bag yields 0.30 cu ft.
- Ground subgrade is rarely perfectly level; a 10% overage buffer prevents running out during a pour.
Häufig Gestellte Fragen
Typische Fragen von Heimwerkern und RenovierernBetonrechner
When should I order a concrete truck instead of mixing bags?
As a general rule, if your project requires more than 1 cubic yard (approx 45–60 eighty-pound bags), ordering ready-mix delivery by truck is faster, produces higher structural strength, and saves strenuous manual labor.
How thick should a concrete slab be?
Sidewalks, walkways, and shed slabs should be 4 inches thick. Driveways supporting passenger vehicles should be 4 to 5 inches thick, and heavy RV pads or commercial driveways should be 6 inches thick with rebar reinforcement.
How many bags of concrete make 1 cubic yard?
It takes forty-five (45) 80 lb bags, sixty (60) 60 lb bags, or ninety (90) 40 lb bags to make exactly 1 cubic yard of solid concrete.
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