Results
Enter measurements to see the required materials.
| Concrete Grade | Mix Ratio (Cement: Sand: Gravel) | Uses |
|---|---|---|
| M5 | 1: 5: 10 | Non-structural applications like paths |
| M7.5 | 1: 4: 8 | Wall foundations under static loads |
| M10 | 1 : 3: 6 | Foundations for single-story buildings |
| M15 | 1: 2: 4 | Driveways, floors, internal flooring |
| M20 | 1: 1.5 : 3 | Reinforced concrete works, slabs |
| M25 | 1 : 1: 2 | Heavy load-bearing structures |
Disclaimer: This calculator tool is provided for informational purposes only. The results generated by this calculator are estimates and should be used as a general reference guide only. Calculations may not account for all variables, specific conditions, or professional requirements relevant to your particular situation. Results should not be relied upon as definitive advice or professional recommendations. Users are responsible for verifying all calculations and consulting with qualified professionals when necessary. The tool creators and contributors make no warranties, express or implied, regarding the accuracy, reliability, or suitability of the calculations for any specific purpose.
Concrete Mix Ratio Calculator
This tool helps you calculate how much concrete you need for your project — whether it’s a driveway, foundation, or path. It works by taking your measurements and adjusting them based on the mix ratio you choose.
How It Works – Simple & Clear
- You pick between metric (meters) or imperial (feet).
- Choose if you want to input dimensions (length × width × height) or total volume.
- Add a waste factor — usually 10% extra is safe for real-world use.
- Select your mix ratio: from M5 up to M25, or set your own custom ratios like 1:1.5:3.
- The calculator then gives you the amount of cement, sand, gravel, and water needed.
Inputs You Can Use
- Length, Width, Height – Enter these when building with dimensions (e.g., a slab).
- Total Volume – Use this if you already know how many cubic meters or yards your project will need.
- Waste Factor – Adjusts the total amount to account for spillage and errors. Default is 10% — can go up to 25%.
- Mix Ratio – Choose from common grades like M15 (1:2:4), M20 (1:1.5:3), or set your own.
What You See in the Results
After entering your data:
- The calculator shows how much wet concrete you’ll end up with.
- It then tells you exactly how many bags of cement, sand, and gravel are needed.
- Plus, it gives a water amount, which is usually about half the weight of cement (e.g., 0.5 times).
- All results are shown in your chosen unit: either metric or imperial.
Why This Matters
Concrete isn’t just about mixing materials — it’s about getting the right strength and durability.
- Using a proper mix ratio means better performance.
- Too little cement leads to weak concrete; too much can cause cracking.
- Your project will last longer if you use the right mix for the job.
When To Use Each Mix Ratio
Here is what each grade is used for:
| Grade | Mix Ratio | Use Case |
|---|---|---|
| M5 | 1:5:10 | Paths or non-structural work |
| M7.5 | 1:4:8 | Wall foundations under static loads |
| M10 | 1:3:6 | Foundations for small buildings |
| M15 | 1:2:4 | Driveways, floors, internal flooring |
| M20 | 1:1.5:3 | Reinforced concrete (slabs, beams) |
| M25 | 1:1:2 | Heavy load-bearing structures |
Tips for Better Results
- Always include a waste factor — even small mistakes add up over large projects.
- If you’re building a slab or footing, use M20 or M25 for strength.
- For paths and footings, M5 or M7.5 is enough.
- Never use custom ratios without checking the balance — too much cement can cause cracking.
How to Use This Calculator
- Select your unit (metric or imperial).
- Choose whether you’re entering dimensions or total volume.
- Pick a mix ratio from the list, or enter your own.
- Adjust waste factor using the slider (default 10%).
- Click “Calculate” — and get all the material needs in seconds.
What You Get
- Total wet volume – How much concrete you’ll actually use.
- Weight of materials – Cement, sand, gravel, and water needed.
- Number of bags – Approximate number based on standard bag sizes (25kg or 94lbs).
- Visual chart – A pie chart showing the mix ratio by volume part.
Bonus: You Can Use This On Any Project
Whether you’re doing a patio, foundation, fence post, or concrete slab — this calculator helps you plan better. No more guesswork.
Remember: good concrete starts with accurate measurements and correct ratios.
This tool is free to use — no account needed. Just enter your data and get the full list of materials required for your project.