Concrete Calculator
Calculate how much concrete you need for your project.
Bags Needed
Materials Breakdown (1:2:3 Mix Ratio)
+ ~ Water (liters)
💡 Order 10% extra for waste and spillage
ℹ️ About Concrete Calculator
The Concrete Calculator sizes a pour for a slab, footing, rectangular column or cylinder in metric or imperial units, with a quantity multiplier and a waste allowance set to 10% by default. It returns volume in cubic meters and cubic yards, weight at a density of 2,400 kg per cubic meter, and how many 40 kg, 60 lb or 80 lb premix bags that comes to. For site mixing it also estimates cement, sand, gravel and water for a 1:2:3 mix. Every figure is worked out in the page.
💡 Use Cases
📋 How to use
Pick the pour under Select Shape: Slab, Footing, Column or Cylinder.
Choose Metric (m) or Imperial (ft/in) so the dimension fields switch between metres and centimetres or feet and inches.
Enter the dimensions for that shape, such as Length, Width and Thickness for a slab, or Diameter and Height for a cylinder.
Set Quantity if you are pouring several identical elements, then click Calculate.
Read the volume in cubic metres and cubic yards and the weight in kg and lbs, all with 10% waste already included.
Use Bags Needed for 40 kg, 60 lb and 80 lb bag counts, and Materials Breakdown for the cement, sand, gravel and water of a 1:2:3 mix.
💎 Pro Tips
- Enter your values carefully — small differences in inputs can lead to large changes in the Concrete Calculator result, especially for long time periods.
- Use the Concrete Calculator to compare multiple scenarios side by side. Open the tool in several tabs to see how different assumptions impact your outcome.
- Bookmark this Concrete Calculator and return whenever your situation changes — small updates in income, rates, or expenses are easy to recompute.
- Export or copy the result before closing the tab. Since the Concrete Calculator stores no data server-side, your inputs reset when you navigate away.
- Combine this Concrete Calculator with our other financial tools (loan, tax, budget calculators) for a more complete financial picture.
❓ Frequently Asked Questions
Yes. The Concrete Calculator is 100% free, with no signup, no paywall, no limits, and no watermarks on results. You can use it as often as you need.
No. The Concrete Calculator runs entirely in your browser. Your inputs stay on your device and are never transmitted to our servers, guaranteeing privacy.
The Concrete Calculator uses industry-standard formulas and returns mathematically precise results based on the inputs you provide. Always verify with a professional advisor for major decisions.
Yes. The Concrete Calculator is fully responsive and works on iOS, Android, and all modern mobile browsers with no app install required.
After the initial page load, most calculations run offline because the logic runs in JavaScript on your device. If you lose connection mid-session, you can usually keep calculating.
While the Concrete Calculator provides accurate computations, it does not replace professional advice. For tax, legal, medical, or major investment decisions, consult a certified advisor.