Circular Slab or Tube Calculator

Purpose:
This calculator helps estimate the volume and weight of concrete needed for circular slabs or tubes (hollow cylinders). Whether you’re pouring a solid foundation, a round patio, or a cylindrical structure (like a pipe or column), this tool ensures you order the right amount of concrete with minimal waste.

Key Features:
✅ Supports Multiple Units – Input dimensions in meters, feet, inches, yards, or centimeters
✅ Handles Both Solid & Hollow Structures – Calculate for solid slabs (set inner diameter = 0) or tubes (enter inner diameter)
✅ Volume Calculation – Results in cubic meters, cubic feet, and cubic yards
✅ Weight Estimation – Provides weight in kg and lbs based on standard concrete density
✅ Bag Quantity Estimate – Determines how many 40lb or 60lb pre-mixed concrete bags are needed
✅ User-Friendly Design – Clean interface with vibrant gradient background for easy readability

Why Use This Calculator?

• Avoid Underordering – Prevents costly delays from running short on concrete
• Reduce Waste – Minimizes excess material by providing precise volume estimates
• Flexible for Any Project – Works for DIY projects (small slabs) and professional construction (large tubes, columns, or culverts)

Example Uses:
🔹 Solid Slab – Driveway, round patio, foundation footing
🔹 Hollow Tube – Drainage pipe, concrete column, septic tank ring

Note: Concrete density varies by mix type. The default is 2400 kg/m³ (150 lbs/ft³), but adjust if using lightweight or high-strength concrete.