Example: Wall length: 40 ft · Wall height: 8 ft · Waste: 5% → 8×16 blocks needed: 378.
Mortar bags (~1 per 28 blocks): 14
Wall area: 320 sq ft
Frequently asked questions
How do I calculate block? Enter your numbers above and the result updates instantly. For example: Wall length: 40 ft · Wall height: 8 ft · Waste: 5% → 8×16 blocks needed: 378.
Is this Block Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for block. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.