Planning a circular patio, water-tank base, or round foundation? This Concrete Round Slab Volume Calculator computes the exact concrete volume you’ll need, helping you cut waste, save cost, and keep timelines tight. Enter your diameter, depth, and optional quantity, choose units, then hit Calculate.

• Precision: Uses the cylinder volume formula for accurate totals.
• Unit-safe: Supports m, cm, inches, feet and outputs in m³, ft³, in³, cm³.
• Multi-slab: Multiply by quantity for multiple identical slabs.
• Waste buffer: Optional 10% allowance toggle for spillage/irregularities.

Formula Used

Volume = π × (Diameter ÷ 2)² × Depth × Quantity

1. Measure the diameter of the circle (edge to opposite edge through the center).
2. Measure the depth (thickness) of the slab.
3. Pick your units and enter quantity if you’re pouring multiple identical slabs.
4. Toggle the 10% waste option if you want a buffer for spillage and uneven subgrade.

Why Accurate Volume Matters

Concrete is sold by volume. Over-ordering raises costs; under-ordering delays work and can compromise quality if mixes are stretched. This calculator gives a precise baseline so you can order confidently, coordinate trucks, and keep your project on track.

Common Uses

• Round patios, fire-pit pads, and garden features
• Water-tank pads, silos, and circular equipment bases
• Circular driveways, landscaping rings, and footing pads

FAQs