محاسبة الحجم والكيلوغرامات
مرشد
محاسبة الحجم والكيلوغرامات
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.
كيفية استخدام
- 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.
خصائص
- 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.
التعليمات
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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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