Concrete & Building

• Concrete Slab & Footing Concrete & Building Cubic metres and yards, 25 kg / 80 lb bag counts, #4 rebar requirements — waste factor included.
• Gravel & Aggregates Concrete & Building Volume and mass for sub-bases and fills — cubic metres and yards, tonnes and US tons, bulk bags.
• Brick & Block Quantity Concrete & Building Units per m² from any brick or block size and joint, single or double skin, plus the mortar volume.
• Mortar Calculator & Mix Ratios Concrete & Building Mortar volume and a cement:sand ratio in — cement bags and sand quantities out.
• Render & Plaster Concrete & Building Wall area, thickness and coats in — cement and sand quantities for render and base coats out.
• Stair Rise & Run Concrete & Building Floor-to-floor rise in — riser count, tread, total run, angle and the 2R + T comfort check out.

• How Much Concrete Do I Need? Volume, waste tiers and the bags-versus-ready-mix decision, in plain English.
• Concrete Mix Ratios Explained What 1:2:3 really means, and when a bagged mix is the smarter choice.
• Concrete Slab Thickness Guide Four inches, five or six? Patios, drives and shed pads, plus why soil and load decide.
• Concrete Reinforcement: Rebar & Mesh What steel actually does, what it does not do, and how much is common practice.
• The Concrete Curing Guide Why the week after the pour matters as much as the pour itself.
• Gravel Driveways and Sub-Bases The layer system, depths by use, compaction and the loose-versus-compacted volume gap.
• How Many Bricks Do I Need? Units per m² by brick size and joint, single versus double skin, waste and mortar allowances.
• Mortar Mix Ratios Explained What 1:4 means by volume, the dry-volume factor, and why soft old brickwork wants lime.
• Stair Dimensions: Rise, Run and Comfort The comfort formula, typical ranges, headroom and the geometry that makes a staircase safe.

Bag Yield Reference

One cubic yard = 27 cubic feet = 0.76 m³. The calculator applies these exact constants.