Concrete Block Calculator
Quickly calculate how many concrete blocks you need for walls, foundations, or blockwork projects. Our user-friendly Concrete Block Calculator also estimates required mortar and total cost—ideal for DIYers, contractors, and architects.
Brick & Block Calculator
Calculate the materials needed for your masonry project in USA, UK, or EU standards
USA Standard Bricks & Blocks
Select Material Type
Standard Brick
8" × 2¼" × 3⅝"
203 × 57 × 92 mm
Modular Brick
7⅝" × 2¼" × 3⅝"
194 × 57 × 92 mm
Concrete Block
16" × 8" × 8"
406 × 203 × 203 mm
Cinder Block
16" × 8" × 8"
406 × 203 × 203 mm
Custom Dimensions
Define your own
Wall Dimensions
Openings (doors, windows, etc.)
Material Costs
UK Standard Bricks & Blocks
Select Material Type
Standard Brick
8⅝" × 2¾" × 4"
215 × 65 × 102.5 mm
Engineering Brick
8⅝" × 2¾" × 4"
215 × 65 × 102.5 mm
Concrete Block
17¾" × 8⅝" × 7½"
440 × 215 × 100 mm
Aerated Block
17¾" × 8⅝" × 7½"
440 × 215 × 100 mm
Custom Dimensions
Define your own
Wall Dimensions
Openings (doors, windows, etc.)
Material Costs
EU Standard Bricks & Blocks
Select Material Type
Standard Brick
240 × 115 × 71 mm
Hollow Brick
240 × 115 × 71 mm
Concrete Block
400 × 200 × 200 mm
Thermal Block
500 × 200 × 200 mm
Custom Dimensions
Define your own
Wall Dimensions
Openings (doors, windows, etc.)
Material Costs
How to Use This Calculator
- Select your region (USA, UK, or EU) to use region-specific brick/block sizes
- Choose the type of brick or block you are using
- Enter your wall dimensions (length, height, thickness)
- Add any openings (doors, windows) if necessary
- Enter the cost of materials if you want to calculate total expenses
- Click "Calculate" to see the results
If you’re building a block wall, foundation, or garden structure, getting accurate material estimates is crucial. Our free Concrete Block Calculator makes it easy to determine how many concrete blocks, how much mortar, and what total cost to expect.
Whether you’re using standard CMUs, cinder blocks, or breeze blocks, the calculator gives precise outputs based on your wall dimensions and block size. This tool is perfect for DIYers working on weekend projects or professional masons planning large-scale construction.
Why Use a Concrete Block Calculator?
Estimating block quantities by hand can be time-consuming and prone to mistakes. Our calculator simplifies the process by giving you:
Accurate block counts based on area and size
Mortar estimates and cost
Adjustable waste margins
Material cost breakdown
How It Works
Enter wall length and height in feet or meters
Choose standard block size or enter custom dimensions
Add mortar thickness (usually 3/8″)
Review block count, mortar volume, and pricing
Concrete Block Sizes
Most common blocks are:
16 x 8 x 8 in (40 x 20 x 20 cm)
12 x 8 x 16 in (30 x 20 x 40 cm)
4 x 8 x 16 in (10 x 20 x 40 cm)
CMUs may have hollow cores or be solid depending on structural requirements. Don’t forget to account for mortar joints in your calculation.
Mortar Requirements
On average, 3/8″ mortar joints will require about 0.6 ft³ of mortar per 100 blocks. That’s roughly 1.5 bags (60 lb) of mortar for every 100 blocks.
A mortar calculator is included in our tool to estimate:
Mortar volume
Bags required
Cost based on your region
Project Examples
Retaining Walls (20 ft x 4 ft): ~120 blocks
Basement Foundation Walls (40 ft x 8 ft): ~480 blocks
Shed or Garage Walls: 150–300 blocks
Garden Walls & Raised Beds: 50–100 blocks
Block and Mortar Cost Breakdown
Typical prices:
Concrete block: $1.25–$2.00 per block
Mortar mix: $6–$10 per 60 lb bag
Installation cost: $10–$15 per ft² (labor)
Block Estimator Benefits
Works for brick, cinder, breeze, and CMU blocks
Supports both imperial and metric units
Includes waste so you’re not short on materials
Mobile- and desktop-friendly design
Concrete Block FAQs
How Do I Calculate Blocks Needed?
Divide wall area by the face area of a single block (including mortar joint). Add 5–10% for waste.
What’s the Difference Between CMUs and Cinder Blocks?
CMU (Concrete Masonry Unit): Made from concrete, stronger and denser
Cinder Block: Lighter, made with coal ash, less commonly used today
How Much Mortar Do I Need?
Use our integrated mortar calculator. On average, one bag of mortar covers about 25–30 standard blocks.
What’s a Breeze Block?
A decorative or lightweight version of concrete blocks, often used for garden or partition walls.
How Do I Estimate Cost?
Multiply number of blocks by block price, and add mortar costs. Include 5% for waste.
Keywords & SEO Optimization
This Concrete Block Calculator targets high-volume keywords such as:
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We’ve also included long-tail and contextual keywords like:
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Whether you’re building a garden wall, shed, or house foundation, our Concrete Block Calculator ensures you’ll have accurate quantities—saving you time, money, and hassle.
Start Building Now
Use our free Concrete Block Calculator to plan your next construction project with confidence. Accurate results, adjustable cost inputs, and integrated mortar estimates make this tool a must-have for anyone working with concrete masonry.