Bauwesen
Verifizierter Rechner mit transparenter Formel
Concrete Slab Calculator.
Estimates the volume of concrete needed for a rectangular slab and its approximate weight.
Ihre Eingaben
So funktioniert es
- 1
Convert thickness from inches to feet by dividing by 12.
- 2
Multiply length by width to get the slab area in square feet.
- 3
Multiply the area by the thickness in feet to get the volume in cubic feet.
- 4
Optionally, divide by 27 to get cubic yards or multiply by 145 to estimate weight.
length * width * (thickness / 12)Häufig gestellte Fragen
How do I convert cubic feet to cubic yards?
Divide the volume in cubic feet by 27, since there are 27 cubic feet in one cubic yard.
What is the weight of concrete per cubic foot?
Standard concrete weighs about 145 pounds per cubic foot, but this can vary with mix and moisture.
Should I order extra concrete?
It's common to order 5-10% extra to account for spillage, uneven subgrade, or slight over-excavation.
Diese Rechner-Kategorie erkunden
Ergebnisse
Formel geprüftSchätzung nur zur allgemeinen Orientierung – wichtige Entscheidungen mit einem geeigneten Fachmann verifizieren.
So funktioniert es
Estimates the volume of concrete needed for a rectangular slab and its approximate weight.
- Convert thickness from inches to feet by dividing by 12.
- Multiply length by width to get the slab area in square feet.
- Multiply the area by the thickness in feet to get the volume in cubic feet.
- Optionally, divide by 27 to get cubic yards or multiply by 145 to estimate weight.
Formeln
Die Mathematik hinter diesem Rechner, aufgeschrieben, damit Sie das Ergebnis überprüfen können.
Volume of a rectangular slab
Multiply the length, width, and thickness (all in the same units) to get the volume.
Example:
Input: L = 10 ft, W = 10 ft, T = 4 in (0.333 ft)
Calculation: 10 × 10 × 0.333
Result: ≈ 33.3 cu ft
Weight of concrete
Multiply the volume in cubic feet by the average density of concrete.
Example:
Input: Volume = 33.3 cu ft
Calculation: 33.3 × 145
Result: ≈ 4,829 lbs
Anwendungsfälle im Alltag
Wo diese Berechnung im täglichen Leben vorkommt.
Patio or walkway
Determine how much concrete to order for a new patio or garden path.
Example: A 10×10 ft patio at 4 inches thick needs about 1.23 cubic yards.
Footing or foundation
Estimate concrete volume for footings or small foundation pads.
Example: A 20×12 ft footing at 6 inches thick requires about 4.44 cubic yards.
Cost estimation
Get a rough volume to compare quotes from ready-mix suppliers.
Example: Knowing the cubic yards helps you estimate delivery and material costs.
Tipps und häufige Fehler
Tips
- Measure in feet and inches, then convert thickness to feet for consistent units.
- Add 5-10% extra to your order to cover waste and uneven surfaces.
- For large slabs, consider ordering ready-mix concrete rather than mixing on site.
- Check local building codes for minimum thickness requirements.
Common Mistakes to Avoid
- Forgetting to convert thickness from inches to feet, leading to a volume 12 times too large.
- Not accounting for waste, resulting in a short pour.
- Using the wrong density for concrete (e.g., using 150 lb/ft³ for lightweight mixes).
Annahmen und Einschränkungen
- Use the stated inputs and units.
- Results are estimates for planning and education.
- Check measurements and source data before making an important decision.