Built for Builders, by Builders
We created Concrete Block Calculator because estimating materials shouldn't require a spreadsheet, three calculators, and a lot of guesswork.
Why We Built This
Every concrete block calculator we found online had the same problem: they only handle one wall at a time. Need to calculate blocks for a garage with four walls and a window? You'd have to run the calculator four times, subtract openings by hand, then add everything up on a separate calculator.
That's a workflow designed for the tool, not for the builder. So we built a calculator that matches how real projects work — multiple walls, each with their own doors and windows, all calculated together with mortar estimates and cost breakdowns included.
The result is a tool that takes you from "how many blocks do I need?" to a complete material list in under a minute. No signup, no ads interrupting your workflow, no guesswork.
What We Believe In
Every decision we make comes back to these four principles.
Accuracy First
We use industry-standard formulas with proper mortar joint calculations. Every block count includes real waste factors, not rounded guesses.
Clean Experience
No pop-ups covering your results. No interstitial ads between steps. The tool works for you, not for advertisers.
Mobile-Ready
Built to work on your phone at the job site. Large touch targets, clear inputs, and results that are easy to read in sunlight.
Your Data, Your Device
All calculations happen in your browser. Your project dimensions never leave your device. We have no database of your projects.
What Sets Us Apart
Multi-Wall Calculator
Add as many walls as your project needs. Each wall gets its own dimensions, and the total updates in real time. No other free calculator does this.
Door & Window Deductions
Add openings to any wall and we'll subtract them automatically. No more hand-calculating area differences — just enter the dimensions and move on.
Complete Material List
Blocks, mortar bags, cement, sand, and cost estimate — all from one set of inputs. Everything you need to walk into the supply store with confidence.
Get in Touch
Have a suggestion, found a bug, or just want to say hello? We'd love to hear from you.
Send Us an Email