How content on Measure & Build gets researched, verified, published and corrected. This page exists so you can judge whether to trust what you read here.
Who writes this
Every calculator and every page on this site is built and written by Saqib Javaid, who holds a BS in Civil Engineering and an MS in Construction Management. There are no anonymous contributors, no outsourced writing, and no AI-generated pages published without review.
Every page carries a byline and a review date. If you can’t tell who wrote something on a website and when it was last checked, that’s a reason to be careful — here, both are always stated.
Where the numbers come from
Formulas and technical guidance derive from published standards, not from other calculator websites. The standards referenced most often:
| Standard | Used for |
|---|---|
| ACI 318 | Structural concrete, cover, development length |
| ACI 332 | Residential concrete construction |
| ACI 302.1R | Floor and slab construction, joints |
| ASTM C94 | Ready-mixed concrete, slump, delivery |
| ASTM A615 / A1064 | Reinforcing bar and welded wire reinforcement |
| ASTM D448 / AASHTO M 43 | Aggregate gradation |
| ANSI Z765 | Residential square footage measurement |
| NIST SP 811 | Unit conversion factors |
Where a figure comes from supplier data rather than a standard — bag yields, material densities, current pricing — that’s stated on the page, along with the range observed across sources.
How every page is verified
- Research first. Standards, manufacturer specifications and multiple independent supplier sources are consulted before anything is written.
- Tables are computed, not copied. Every row in every reference table is generated from the same formula the calculator uses, then checked against the calculator’s output. When those disagree, something is wrong and it gets fixed before publication.
- Worked examples are checked independently. Each example is calculated separately from the table it illustrates, so an error in one surfaces against the other.
- Ranges are published where sources disagree. Guidance on gravel driveway depth ranges from 4 to 18 inches across reputable sources. Rather than picking one, the page gives the range and the context that determines where you fall in it.
- Methodology is disclosed. Every calculator has a section at the foot of its page listing exactly what constants it uses, what it assumes, and what it excludes.
Computing tables rather than copying them has caught mistakes in my own drafts more than once — a rounding difference in a concrete quantity, a slab thickness applied to the wrong project type, several bag-count figures that didn’t match the formula. Those were found and fixed before publication because the process is designed to surface them, not because I got them right first time.
What we don’t do
- No fabricated precision. Material densities are not constants and aren’t published as though they are. Estimates are labelled as estimates.
- No undated cost figures. Construction pricing moves. Every cost page states when it was last reviewed.
- No rules of thumb dressed as code. A rule of thumb is labelled as one. A code requirement is labelled as one. Conflating them is how people get hurt.
- No advice beyond competence. Where a question needs a licensed engineer, the page says so rather than guessing.
- No padding. Content is as long as the subject requires and no longer.
- No advertiser influence. Advertising funds the site. It has never changed a calculation, a recommendation or a figure, and it never will.
Reviews and updates
Pages are reviewed and the date at the foot updated when:
- A referenced standard is revised
- Cost data drifts materially — cost pages are reviewed at least annually
- A reader reports an error
- A calculator is improved in a way that changes its output
- Better source data becomes available
The review date is only updated when the page has genuinely been re-checked. Refreshing dates on untouched pages to look current is a common tactic and a dishonest one.
Corrections
If something here is wrong, I want to know. Email [email protected] with the page, what you entered, what you got, and your source if you have one.
Corrections are made to the page and the review date updated. Where an error was significant enough to have affected someone’s order, it’s noted on the page rather than quietly amended.
On AI
Drafting and code assistance are used in producing this site, as they are almost everywhere now. What matters is what happens afterward: every formula is checked against a published standard, every table is computed and verified against the calculator, and every page is reviewed by someone who understands the subject before it goes live.
Nothing is published here that hasn’t been checked by a person with a civil engineering background. The verification process described above is the reason to trust the output — not a claim about which tools were involved in producing it.
Independence
Measure & Build is independent. It is not owned by, sponsored by, or affiliated with any material supplier, manufacturer, contractor or trade body. It doesn’t sell materials, take referral fees from contractors, or maintain a paid directory.
Revenue comes from display advertising, which is selected by ad networks rather than by me. Where any affiliate or sponsored relationship exists, it is disclosed on the page it appears on.