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Concrete Calculator

Calculate concrete volume in cubic yards or meters for slabs, columns, footings and tubes.

Concrete needed
1.36 yd³
1.04 m³
Concrete needed (with waste)
1.36 yd³
1.04 m³
Bags needed
62
80 lb bags
Estimated cost
$372.00
Volume (no waste)
1.23 yd³
0.94 m³
Bags (no waste)
56

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  • Formula-verified

    Each calculator is unit-tested against authoritative sources.

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How to use the Concrete Calculator

  1. 1

    Enter your inputs

    Fill in the required fields at the top of the concrete calculator. Each input shows a default placeholder so you can see the expected format and units before you type.

  2. 2

    Adjust assumptions and options

    Use the toggles, sliders and dropdowns to tailor the calculation to your situation — currency, country, time period, advanced options and any optional fields all change the result in real time.

  3. 3

    Review the result

    The result card updates instantly as you type. Read the headline number, then check the breakdown, chart and any per-period schedule to understand how the inputs combined to produce the answer.

  4. 4

    Compare scenarios

    Change one input at a time to see how sensitive the result is to that variable. This is how you build intuition: small changes that move the answer a lot are the levers that matter.

  5. 5

    Share or save your result

    Copy the shareable link to send the exact scenario to someone else, or use your browser to print or save the page. The URL preserves every input so the recipient sees the same answer you do.

Frequently Asked Questions

  • Slab: length × width × thickness. Column/cylinder: ? × radius² × height. Footing: same as slab. Convert to cubic yards (÷27 from cubic feet) or cubic meters.

  • About 0.45 cubic feet (0.0125 m³). An 80 lb bag yields ~0.6 cubic feet (0.017 m³). One cubic yard = 60 bags of 60 lb or 45 bags of 80 lb.

  • Yes — typically 5-10%. Larger pours: 5%. Smaller intricate pours: 10-15%. Better to have a little extra than to be short mid-pour.

  • Above ~1 cubic yard (45-60 bags), ready-mix delivery is usually more cost-effective and ensures uniform mix. Below, bagged concrete is convenient.

  • Patios/walkways: 4 inches. Driveways: 4-6 inches (depending on vehicle weight). Garage floors: 4-6 inches. Foundations: 8 inches+.

  • For most projects, 4,000 PSI mix is standard. Higher PSI for structural elements, lower for decorative or non-structural pours.

  • Initial set: 24-48 hours. Walkable: 1-2 days. Drivable: 7-10 days. Full strength: 28 days. Keep moist during cure for maximum strength.

  • Slabs over 4 inches and any structural element should have rebar or wire mesh reinforcement. For thin decorative pours, fiber-reinforced mix is an alternative.

  • Ready-mix delivered: $120-180/cubic yard (US, 2024-25). Bagged equivalent: $200-300/cubic yard but no delivery fees. Add labor if hiring out.

  • Typical base: 4-6 inches of compacted gravel under slabs. Use the same volume formula: length × width × base depth.

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