Select a Concrete Structure to Calculate Volume

Slab / Floor (Rectangular or Square)

Input: Length, Width, Thickness

Output: Wet volume, dry volume, material quantities (cement, sand, aggregate)

Length Width Thickness

Footings (Rectangular or Isolated Pad)

Input: Length, Width, Depth

Option for multiple footings

Diameter Depth

Circular Slab / Tube / Tank

Input: Diameter, Height/Thickness

Used for water tanks, circular pads

Outer Diameter Inner Diameter Length

Curb and Gutter

Input: Base width, top width, height, length

Common for roadside concrete calculations

Curb Depth Gutter Width Curb Height Flag Thickness Length

Stairs

Input: Number of steps, tread, riser, width

Stringer thickness option

Automatically compute inclined slab volume

Run Rise Width Platform Depth Steps

Concrete Cost Estimation

Input unit cost of cement, sand, and aggregate

Add cost per m³ for ready mix

Output: Total material cost, Per m³ cost

Concrete Mix Ratios – Standard and Custom

Select from standard mix ratios or create your custom mix for specific project requirements.

Common Mix Ratios

1:1:2
Very High Strength
1:1.5:3
High Strength
1:2:3
Standard
1:2:4
General Purpose
1:3:5
Medium Strength
1:3:6
Lean Mix
1:4:8
Very Lean
1:5:10
Filling Concrete

Custom Mix Ratio

Enter your custom cement:sand:aggregate ratio

Test Your Concrete Knowledge

Challenge yourself with these 15 real-world concrete calculation questions. Test your knowledge and see how well you understand concrete volume calculations, mix ratios, and cost estimation.

How to Use the Concrete Calculator

  1. Select structure type (e.g. Slab)
  2. Enter dimensions (in meters/feet)
  3. Choose mix ratio or enter custom
  4. Enter wastage % (optional)
  5. Click Calculate
  6. See output: Wet Volume (m³), Dry Volume (with 54% conversion), Cement in bags (50kg), Sand & aggregate in m³, Optional cost (based on local price)

Why Use This Calculator?

  • No signup required
  • Works for multiple shapes
  • Mix ratio logic built-in
  • Ideal for site engineers and DIY use
  • Mobile responsive

Premium Features

Precise Calculations

Get accurate volume estimates for all types of concrete structures

Cost Estimation

Calculate project costs including materials and labor

Mix Ratios

Determine the right proportions of cement, sand, and aggregate

Easy Sharing

Share your calculations with colleagues and contractors

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Frequently Asked Questions (FAQ)

For a 10x10 slab with a standard 4-inch thickness, you would need approximately 1.24 cubic yards of concrete. This calculation assumes a rectangular slab with consistent thickness throughout.

1.54 is commonly used (i.e., dry volume = wet volume × 1.54). This conversion factor accounts for the increase in volume when dry ingredients are mixed with water to form wet concrete.

For 1:2:4 mix, ~6.3 bags per m³ (varies by ratio). The exact number of bags depends on the mix ratio and the size of the cement bags (typically 50kg).

50 kg is standard, but allow user to change. In some regions, 40kg or 25kg bags might be more common, so it's important to check local standards.

Yes, supports circular slabs, tanks, tubes. Simply use the "Circular Slab / Tube" tab and enter the appropriate dimensions for your project.

Concrete Tips & Best Practices

Order Extra Concrete

Always order 5-10% more concrete than your calculations indicate. This accounts for spillage, over-excavation, and variations in formwork.

Proper Preparation

Ensure your forms are sturdy and properly aligned. The ground should be compacted and free of debris before pouring concrete.

Weather Considerations

Avoid pouring concrete in extreme temperatures. In hot weather, keep the concrete moist. In cold weather, use blankets or heaters to prevent freezing.

Reinforcement

Consider adding rebar or wire mesh to your concrete for increased strength, especially for slabs and structural elements.

Concrete Types and Applications

Standard Concrete (3000-4000 PSI)

Standard concrete is the most commonly used type for residential construction. It's ideal for sidewalks, driveways, patios, and other non-structural applications. Its compressive strength of 3000-4000 PSI makes it durable enough for everyday use while remaining cost-effective.

High-Strength Concrete (5000+ PSI)

High-strength concrete is designed for structural applications where additional durability is required. It's commonly used for foundations, columns, beams, and other load-bearing elements. The higher PSI rating provides increased resistance to cracking and structural failure.

Lightweight Concrete

Lightweight concrete incorporates lightweight aggregates like expanded clay, shale, or slate. It reduces the overall weight of the structure while maintaining adequate strength. It's ideal for applications where reducing structural load is important, such as in upper-level floors or retrofit projects.

Decorative Concrete

Decorative concrete includes stamped, stained, or polished concrete that enhances aesthetic appeal. It can mimic the appearance of natural stone, brick, or wood while providing the durability of concrete. It's popular for interior floors, countertops, and outdoor patios.

Concrete Curing Process

Proper curing is essential for achieving the maximum strength and durability of concrete. The curing process involves maintaining adequate moisture content and temperature for a specific period after placement.

Environmental factors significantly affect the curing process. In hot weather, concrete may cure too quickly, leading to reduced strength. In cold weather, freezing can damage the concrete structure. Adjust your curing methods based on weather conditions to ensure optimal results.