Concrete Calculator

One of the most common questions in construction is "how much concrete do I need?" Under-ordering means a second trip and a visible pour line. Over-ordering wastes money. This calculator gives you the exact volume for any shape — slab, footing, column, tube, or stairs — then converts it to the number of pre-mixed bags you'll need. Choose your shape, enter dimensions in metric or imperial, add a waste percentage (5–15% is typical), and get instant results: total volume in cubic yards or cubic meters, number of bags by size, estimated weight, and cost. The calculator handles all the unit conversions internally so you never have to think about feet-to-inches or cm-to-meters. Whether you're pouring a patio, setting fence posts, building a retaining wall footer, or forming concrete steps — this tool saves you from the math and from the hardware store return line.