🏗️ Concrete Calculator PRO
Volume, rebar, formwork, material breakdown & cost — all in one.
Dimension Diagram — updates as you type
Slab plan view. Length × width gives the area; thickness gives the depth of the pour.
1 Project Type
2 Shape
3 Dimensions
4 Rebar (Optional)
5 Options
Labour Cost
Results
Volume
Bags Needed
Material Breakdown (approximate)
Rebar
Formwork
Cure Time
⚠️ Pre-Export Checklist
- Footings measured on-site
- Sub-grade compacted and level
- Reinforcement placed per structural drawings
- Formwork secured and oiled
- Building permit obtained
- Weather forecast checked (no rain for 24h)
- Pump truck / wheelbarrows arranged
Professional Concrete Estimation Guide
Show formulas, worked examples & pro tips ▼
Formulas
Rectangle = L × W × T
L-Shape = (L₁ × W₁) − (L₂ × W₂) × T
Trapezoid= ((Top + Bottom) ÷ 2) × Length × T
Circle= π × r² × Depth × Quantity
Stairs= Number of steps × (Riser × Tread × Width)
Material Mix (1:2:3 ratio):
Cement = Volume ÷ (1+2+3) × 1.5 (bags per cu ft)
Sand = Volume × (2 ÷ 6) × 1.5 tons per cu yd
Gravel = Volume × (3 ÷ 6) × 1.5 tons per cu yd
Rebar Weight= Bars × Length × Weight per ft (varies by bar size)
Worked Example — 10×10 ft Slab, 4" thick
- Volume: 10 × 10 × (4÷12) = 33.3 cu ft = 1.23 cu yd
- Bags (80 lb): 33.3 ÷ 0.60 = 56 bags → with 10% waste = 62 bags
- Cement: ~62 bags × 94 lb = 2.9 tons cement
- Sand: ~1.1 cu yd = 1.6 tons
- Gravel: ~1.6 cu yd = 2.4 tons
- Water: ~33.3 × 6 gal/cu yd = 25 gallons
- Rebar (#4 @ 12" O.C. both ways): 11 bars × 10 ft = 110 ft = 73.5 lb
Common Mistakes to Avoid
- Forgetting to convert inches to feet (4 in = 0.333 ft, not 4)
- Not adding waste — always 5-15% depending on site conditions
- Using wrong bag yield — 80 lb = 0.6 cu ft, 60 lb = 0.45, 40 lb = 0.30
- Ignoring rebar overlap — add 40× bar diameter for each splice
- Not checking concrete pump accessibility for large pours
- Pouring in direct sunlight without curing compound
Pro Tips
- For pours >1 cu yd, order ready-mix trucks instead of bags
- Use a concrete vibrator to eliminate air pockets
- In hot weather (>90°F), add ice to mix water to slow setting
- Spray curing compound immediately after finishing
- Control joints should be spaced at 24-30× slab thickness
- Order 10% extra — uneven subgrade always uses more concrete
Drag to rotate — Scroll to zoom
Related Calculators
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
Use our free online Hormigón calculator to get accurate materiales y costos estimates for your construction project. Enter your dimensions and receive instant results with material quantities and cost breakdowns.
This calculator is built for contractors and DIY enthusiasts who need reliable numbers fast. Whether you are working on a residential renovation or a commercial build, it provides the accuracy you need to order materials with confidence and stay on budget.
📖 How to Use This Hormigón Calculator
How to Use This Hormigón Calculator
📐 Understanding the Hormigón Formula
The basic formula uses project dimensions to calculate required quantities. Volume = Length × Width × Depth. Convert to the required units and add the waste factor. This calculator handles all conversions automatically so you get accurate results every time.
For more complex calculations involving weight, density, and coverage rates, the calculator applies industry-standard factors specific to your project type. The cost estimation multiplies quantities by your entered unit prices for a complete material budget.
⚠️ Common Mistakes to Avoid
Not using consistent units
✓ Ensure all dimensions are in the same unit system. Mixing feet and inches will produce incorrect results.
Forgetting waste factor
✓ Always add 5-10% extra material for cuts, breakage, and irregularities.
Underestimating material needs
✓ Order sufficient material to avoid costly project delays.
Ignoring delivery costs
✓ Factor in delivery fees when budgeting for your project.
💡 Professional Tips
Always order slightly more material than calculated to avoid project delays.
Check local building codes before starting your project.
Order materials well in advance to ensure availability.
Consult with experienced professionals for complex projects.
Keep records of your actual usage for future project planning.
❓ Frequently Asked Questions
Enter your project dimensions, select the appropriate options, and the calculator will provide material quantities and cost estimates instantly.
Yes, this calculator works for both residential and commercial projects of any scale.
Our calculator provides estimates within 95% accuracy based on standard industry factors.
Yes, you can print or save the results for your records.
🏗️ Real-World Applications
Our Hormigón calculator is useful for a wide range of projects. Whether you are doing a small repair or a large construction project, this tool provides accurate estimates that help you plan and budget effectively. Contractors use it during the bidding phase to generate material takeoffs, while homeowners rely on it for accurate cost planning.
For residential projects, the calculator helps you determine exactly how much material you need, preventing both shortages and excess. For commercial applications, it scales to handle larger quantities and more complex calculations. The cost breakdown shows material cost per unit, which is the standard metric for comparing bids and tracking project profitability.
Our free Hormigón calculator is the most accurate online tool for estimating materiales y costos. Use it for any construction project to get reliable material quantities and cost estimates.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.