Concrete Calculator

Calculate concrete volume, determine bag quantities, and estimate raw materials needed for slabs, walls, footings, and circular pours. Supports both metric and imperial measurements with built-in waste calculations.

Calculate Concrete Requirements

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Results

Select a shape and enter dimensions to calculate concrete requirements

Shape Visualization

Select Shape

What is Concrete Calculator

Estimating concrete doesn't need to be complicated. Whether you're pouring a small patio or planning a larger project, knowing how much concrete you need can save both time and money.

This Concrete Calculator is designed to make planning easy. You start by selecting the shape of your project, enter the dimensions, and the calculator takes care of the rest. It works with both metric and imperial units, so you don't need to convert measurements yourself.

What makes this tool especially useful is the way it presents the results. Instead of just showing a volume number, it tells you how many concrete bags you'll need and allows you to include extra material for waste. This helps avoid last-minute trips to the store or leftover concrete.

The layout is clean and visual. Diagrams show exactly which measurements to enter, making it easy even if you've never used a concrete calculator before. Everything stays on one screen, so the process feels simple and straightforward.

This calculator is helpful for homeowners working on DIY projects, contractors planning jobs, and students learning construction basics. It focuses on clarity, accuracy, and real-world use.

With clear inputs and reliable results, this Concrete Calculator helps you plan your project with confidence.

How to Use the Concrete Calculator

1

Choose Your Shape

Select the type of concrete work you're planning - slab, wall, footing, or circular pour.

2

Enter Dimensions

Input your measurements using either metric or imperial units. The calculator handles conversions automatically.

3

Get Your Estimate

Receive detailed concrete volume, bag counts, and material breakdowns including waste margins.

Understanding Concrete Calculations

Why Accurate Concrete Estimation Matters

Concrete work requires precise planning. Too little concrete means costly delays and wasted time. Too much means you're paying for materials you'll never use. This calculator helps you find the sweet spot by accounting for the actual volume needed and adding a safety margin for waste.

Common Concrete Applications

  • Slabs and Floors: Driveways, patios, garage floors, and basement slabs
  • Walls: Foundation walls, retaining walls, and boundary walls
  • Footing and Columns: Support structures that bear building weight
  • Circular Work: Round patios, fountain bases, and manhole covers

Concrete Bag Sizes and Coverage

25 kg Bags

Approximately 0.017 m³ of concrete when mixed. Good for small projects and repairs.

40 kg Bags

Approximately 0.027 m³ of concrete. Popular choice for medium-sized DIY projects.

50 kg Bags

Approximately 0.034 m³ of concrete. Efficient for larger projects with fewer bags to handle.

Planning for Success

Always order 5-10% extra concrete to account for spillage, uneven mixing, and small measurement errors. Consider the concrete's slump (workability) requirements for your specific application. For best results, mix only what you can pour within 20-30 minutes.