About ToolSite
Free concrete block estimating tools built on industry-standard masonry arithmetic — no paywalls, no sign-ups, no nonsense.
Why We Built This
Estimating concrete block quantities by hand is tedious. You measure the wall, figure out the effective block dimensions with mortar, divide twice, multiply, round up, then add a waste factor — and if you made an error somewhere, you find out mid-project when you run short. We built this calculator to eliminate that friction.
The formula isn't a secret. It's the same coursing arithmetic in every masonry estimating manual: divide wall length by effective block length (block + mortar joint) to get blocks per course, divide wall height by effective block height to get the course count, multiply, then apply your waste allowance. We've implemented it carefully, verified it against the National Concrete Masonry Association (NCMA) TEK Note 5-2B, and made it free to use.
We handle five standard CMU sizes — 8×8×16 (standard), 4×8×16 (partition), 6×8×16 (medium), 12×8×16 (heavy), and 8×4×16 (half-height) — with configurable mortar joint thickness and waste factors from 5% to 20%. You get the block count, course layout, wall area, and material cost estimate in one calculation.
Built for Construction
Every input, output, and waste factor recommendation reflects how masonry estimating actually works on job sites — not how it looks in a spreadsheet template.
Our Mission
Reliable estimating tools should be free and accessible. We don't require an account, don't sell your data, and don't put accurate results behind a paywall.
Verified Formulas
Our calculations are based on NCMA coursing standards and MCAA estimating guidelines. We cite all sources directly on the calculator page.
Educational Content
Beyond the calculator, our blog covers masonry estimating, block types, mortar selection, retaining wall design, and more — written at the level of a working contractor.
How We Research and Verify
Every calculator formula is traced back to a primary source — typically an NCMA TEK Note, an ACI (American Concrete Institute) specification, or an MCAA installation guide. We don't use "industry standard" as a hand-wave; we cite the specific document.
Blog content is researched against construction codes (IBC, IRC), NCMA publications, and supplier data from major masonry distributors. When we cite cost ranges, we pull from regional pricing data and note that local conditions vary — we don't pretend a number that's accurate in the Southeast applies equally in the Pacific Northwest.
If you find an error — a wrong formula, an outdated spec, or a cost range that's way off for your region — please tell us. We'd rather know and fix it than have someone order 200 blocks too few because of a calculation mistake on our end.
Get in Touch
Found a formula error, have a question about an estimate, or want to request a new feature?
contact@example.com