How much concrete do I need for a terrace?

Terraces are usually larger slabs than patios, so the same calculation applies but the ordering allowance becomes more important.

Best for

Worked example

A 8 m by 4 m terrace at 0.12 m thickness

A terrace uses the same rectangular slab calculation as a patio, but the larger area makes rounding up a little more worthwhile.

Example

8 m × 4 m × 0.12 m = 3.84 m3. With 8 percent waste, the adjusted order volume is 4.15 m3.

Formula

Volume = length × width × thickness

Adjusted volume = volume × (1 + waste / 100)

Planning notes

Break the terrace into smaller rectangles if it has steps or openings.

A larger visible surface can use extra material during finishing and edging.

A modest waste factor keeps the order safer for long pours.

Use the slab page for a generic slab estimate.

Switch to a patio page for the smaller outdoor slab intent.

Open the main calculator for custom dimensions and waste.