Concrete Block Calculator
Professional block calculator for accurate block quantities, mortar volume and cost estimation for all types of concrete block walls
Concrete Block Calculator
Wall Dimensions
Block Specifications
Standard joint thickness: 10mm (3/8 inch). Set to 0 for dry-stacked blocks.
Pricing & Waste
Add extra blocks for breakage and cutting (typically 5-10%)
Enter wall and block dimensions, then click Calculate
Why Use Our Block Calculator?
How to Calculate Concrete Blocks
Follow these simple steps to calculate blocks for your wall project:
Common Block Wall Applications
Block Walls
Standard concrete block walls for residential and commercial buildings, both interior and exterior.
Fences
Concrete block fences for privacy and security. Durable and low-maintenance solution.
Retaining Walls
Structural walls designed to hold back soil and create level areas in sloped terrain.
Block Calculator Features
Precise Measurements
Input exact wall dimensions and block sizes with support for both metric and imperial units.
Accurate Calculations
Get precise block count and mortar calculations accounting for joints and waste.
Instant Results
Get immediate calculations with detailed material breakdown and cost estimates.
Block Calculator FAQ
The most common concrete block size is 40×20×20cm (16×8×8 inches) in metric/imperial. However, blocks come in various sizes including 39×19×19cm, 20×20×40cm, and custom dimensions.
Calculate the wall area (length × height), then divide by the block face area including mortar joints. For example: a 10m × 3m wall = 30m². With standard blocks (0.41m × 0.21m including joints) = 30 ÷ 0.086 ≈ 349 blocks.
Mortar volume depends on joint thickness (typically 10mm) and block size. Our calculator automatically determines mortar volume based on your wall dimensions and block specifications.
Common mortar mix ratio is 1:6 (cement:sand) for general block work, or 1:4 for stronger joints. The exact ratio depends on the application and local building codes.
Order 5-10% extra blocks to account for breakage, cutting, and waste. This calculator helps you get the base quantity needed for your wall.
Calculate Your Block Wall Today
Get accurate block calculations for your wall project. Whether it's a garden wall, fence, or building foundation, our calculator provides precise block count, mortar volume, and cost estimates.