Ready-Mix Concrete Calculator
Area: m²
Area: ft²
Volume: m³
Volume: yd³
Weight: tonnes
Ready-Mix Concrete Calculator (UK & USA)
```This calculator helps DIYers, builders, and landscapers accurately estimate the volume of ready-mix concrete needed for any slab, path, foundation, or driveway project. Whether you’re pouring a patio in Leeds or a sidewalk in Texas, this tool supports both metric and imperial units.
Technical Guidance
- 🇬🇧 UK Mixes: C20/25 for general use, C25/30 for driveways, C30/37 for heavy-duty
- 🇺🇸 US Mixes: 3000 psi (general), 3500 psi (driveways), 4000 psi (heavy-duty)
- Depth recommendations:
- Paths: 75–100mm (3–4")
- Driveways: 100–150mm (4–6")
- Roads: 150–225mm (6–9")
Material Density
| Material | Density (kg/m³) | Density (lb/ft³) |
|---|---|---|
| Ready-Mix Concrete | 2400 | 150 |
Pro Tips
- Add 5–10% extra for waste and spillage
- Don't pour below 5°C (41°F) without additives
- Use a polythene sheet to stop moisture loss
Common Mistakes
- Forgetting to convert dimensions to consistent units
- Ignoring compaction and base prep
- Misjudging depth for load-bearing areas
FAQs
- How much concrete do I need for 10m² at 100mm?
1.0m³ or approx. 2.4 tonnes - What's the best mix for a driveway?
UK: C25/30, USA: 3500 psi - How many bags in a cubic metre?
Roughly 40 x 25kg bags (UK) or 60 x 94lb bags (USA)
