How the guides on Calculator for Concrete are researched, written and checked, the standards every page has to meet before it is published, and what happens when we get something wrong.
Numbers First
This site exists to produce numbers people order real material with, so accuracy outranks everything else. Every worked example in every guide is computed by hand from the stated formula and then matched against the corresponding calculator’s output. If the two disagree, the page does not publish until the difference is found and fixed.
Sources
- Conversions and yields: the definitions themselves, 27 ft³ per cubic yard, and the yields printed by US bagged-concrete manufacturers.
- Practice and ordering: National Ready Mixed Concrete Association (NRMCA) guidance.
- Mix, placement and curing: American Concrete Institute (ACI) practice and Portland Cement Association (PCA) guidance.
- Sizes set by law: local building codes, which the guides name as governing wherever they apply.
We do not invent statistics. Where a guide needs a figure we cannot verify, a market price, a search volume, an industry average, it is either labelled as a planning example with its basis stated, or left out.
Review Policy
Pages carry an author box stating who wrote the content and its review status. We claim engineer review only when a named, credentialed engineer has actually reviewed that page, and the box says so in those cases, otherwise it states plainly that no engineer review is claimed.
Corrections
Readers can report an error through the Contact page. A reported figure is re-derived from its formula; if it is wrong, it is corrected in the guide and in the calculator if needed, and material corrections are noted on the page.
Commercial Independence
The calculators are free and their results are never influenced by advertisers or suppliers. No supplier can pay to change a formula, a yield figure or a cost comparison outcome. Prices inside the tools come from the user’s own inputs.
Updates
Guides carry a “last updated” date. Pages are revisited when standards, bag yields or common practice change, and whenever a correction shows the surrounding content needs another look.