DIY Concrete Mix Calculator
DIY Concrete Mix Calculator
```This DIY Concrete Mix Calculator helps homeowners, handymen, and small builders figure out exactly how much cement, sand, and gravel is needed to mix concrete for driveways, footings, slabs, and general repairs. Works with both metric (UK) and imperial (USA) units.
What It Does
- Estimates quantities of cement, sand, gravel, and water
- Supports 1:2:3 mix ratio by default (cement:sand:gravel)
- Perfect for DIY paving slabs, patios, and fence posts
Material Densities
| Material | Density (kg/m³) | Density (lb/ft³) |
|---|---|---|
| Cement | 1440 | 90 |
| Sand | 1600 | 100 |
| Gravel | 1700 | 106 |
| Water | 1000 | 62.4 |
Pro Tips
- For slabs: 100mm depth is standard in UK/US
- Add ~10% extra material for waste
- Always mix thoroughly to avoid weak spots
Mistakes to Avoid
- Too much water weakens mix
- Skipping compaction = cracks later
- Forgetting weather considerations when setting
FAQs
- What’s the best DIY concrete ratio?
1 part cement, 2 parts sand, 3 parts gravel, water as needed - How much concrete does a 25kg bag make?
Roughly 0.01–0.012 m³ per bag - Can I mix concrete by hand?
Yes! Use a wheelbarrow, tarp, or mixing tray for small jobs
