Concrete Mix Ratios Reference Table
Common mixes are 1:2:4 for general work, 1:3:6 for foundations, and 1:1.5:3 for columns; a 40 kg bag yields ~0.018 m³ and ~55–60 bags fill 1 m³.
A citable quick-reference for the most common concrete mix ratios, bag yields per cubic meter, and typical compressive strengths. Use it alongside our calculators when planning a pour.
ConcreteMix ratioCompressive strengthBag yield
Standard Mix Ratios by Application
These cement:sand:aggregate (C:S:A) ratios are widely used for the listed applications. Always confirm required strength with local codes and a structural engineer.
| Application | Mix ratio (C:S:A) | Typical use |
|---|---|---|
| General slabs & beams | 1 : 2 : 4 | Floors, paths, non-structural beams |
| Foundations & footings | 1 : 3 : 6 | Mass concrete, strip footings |
| Columns & high strength | 1 : 1.5 : 3 | Load-bearing columns, precast |
| Mortar (not concrete) | 1 : 4 to 1 : 6 | Block/brick laying (cement:sand) |
| Plaster | 1 : 4 to 1 : 5 | Wall finishing (cement:sand) |
Bag Yield per Cubic Meter
Yield assumes a standard density mix. Add 5–10% extra for wastage, spillage, and uneven subgrades.
| Bag size | Bags per m³ | Notes |
|---|---|---|
| 20 kg | 110–120 | More handling, smaller jobs |
| 25 kg | ~55–60 | Common retail size |
| 40 kg | 55–60 | ~0.018 m³ yield per bag |
Compressive Strength Guide
Approximate 28-day cube strengths for guidance only; actual strength depends on materials, compaction, and curing.
| Mix ratio | Approx. strength (MPa) | Common grade |
|---|---|---|
| 1 : 3 : 6 | ~10–15 | Lean / non-structural |
| 1 : 2 : 4 | ~20–25 | M20 (general) |
| 1 : 1.5 : 3 | ~30+ | M30 (structural) |
FAQ
- What is the most common concrete mix ratio?
- 1:2:4 (cement:sand:aggregate) is the most common for general construction.
- How many 40kg bags fill 1 m³?
- About 55–60 bags, depending on mix ratio and wastage.
- Which mix is strongest?
- 1:1.5:3 (richer in cement) gives the highest typical compressive strength of the common mixes.
- Can I use this table for structural design?
- No. It is a planning reference only; final mixes must meet project specs and local codes.