Concrete Block Calculator – Estimate Your Building Needs
Planning a construction or landscaping project? Use our free Concrete Block Calculator to estimate how many blocks you’ll need. Just enter your wall’s height and length, and get instant calculations for block count and total area. Perfect for builders, DIYers, and site planners alike.
Ready to get started?
Concrete Block Calculator (Kelvin Timber)
Enter wall size, subtract openings, choose block type, then add blocks + mortar + extras to basket.
Assumes 440×215 blocks
Assumes 10mm mortar joints
Waste default 5%
1) Wall size
Covers cuts, breakages & site conditions.
2) Choose blocks
Block count based on standard UK face size + 10mm joints.
Smart mix = full pallets + remainder as singles (least waste).
Tip: mortar & sand are estimates. Mix, joint thickness & block type can change usage.
3) Optional extras
Only enables when openings are added.
Tip: set to number of openings using lintels.
Heads up: lintel type depends on load. This tool helps with length + quantity only.
Auto-calcs rolls from wall length (30m rolls).
Auto from wall length ÷ 30m. You can override.
Weep vents / ties can be added later as manual extras if needed.
Results & basket
| Item | Qty | Pack |
|---|
NEED HELP?
Not building your standard wall?? Call 01698 421 366 or email us at sales.east@kelvintimber.co.uk for a custom quote or friendly advice.
By using our calculator, you agree to our Terms and Conditions.
Send Us A Quote Request
Head over to our quote page and send the team a list of materials and we will see what our best price is.