About – Saqib Javaid, Measure & Build

I’m Saqib Javaid. I build the calculators on this site, write the guidance that goes with them, and check every number that gets published.

Why this site exists

Almost every construction calculator online does one multiplication and stops. Length times width times depth, divided by twenty-seven, here’s your answer. That’s arithmetic, and it’s usually the least important part of the problem.

What matters is everything around it. Gravel loses fifteen to twenty-five percent of its depth the moment you compact it, so ordering for finished depth leaves you short. Rebar runs longer than a twenty-foot stick need lap splices you pay for and never see. A 4×4 post displaces eleven percent of the concrete in its hole. Welded wire mesh sheets lap at the joints, so they don’t cover their full fifty square feet. Monolithic slabs have thickened edges that can be a third of the total volume.

None of those are obscure. They’re standard practice, and any estimator would account for them without thinking. But they’re missing from most of the calculators people actually find — which is how someone ends up with a mixer truck idling in the driveway and not enough concrete to finish the pour.

Measure & Build exists to close that gap. The tools here handle the details, and every page explains the reasoning so you can check the working rather than take my word for it.

My background

I hold a Bachelor of Science in Civil Engineering and a Master of Science in Construction Management. The first gave me the structural and materials grounding — why a slab cracks where it does, what reinforcement is actually doing, how loads move through a footing. The second covered the side that decides whether a project works in practice: estimating, quantity takeoff, scheduling, cost control and procurement.

That combination is why this site has both quantity calculators and cost calculators, and why the cost tools produce line-item estimates rather than a single dollars-per-square-foot figure. A takeoff and a bid comparison are the same skill applied twice — and both are things people are routinely asked to do without ever having been taught how.

How the numbers get verified

Every figure published here goes through the same process, and it’s deliberately boring.

1. Formulas come from published standards, not from other calculator websites. Concrete and reinforcement work references ACI 318, ACI 332 and ASTM specifications. Aggregate gradations reference AASHTO M 43 and ASTM D448. Unit conversions use NIST factors.
2. Every table is computed, not copied. Each row is generated from the same formula the calculator uses, then checked against the calculator’s own output. When those two disagree, something is wrong and it gets fixed before publication. This has caught real errors in my own drafts more than once.
3. Material weights are cross-referenced across multiple suppliers and published as mid-range values with the observed spread shown. Density varies with source rock, moisture and compaction, and presenting a single number as fact would be dishonest.
4. Where sources genuinely disagree, I say so. Published guidance on gravel driveway depth ranges from four inches to eighteen. Rather than picking one and stating it as gospel, the page gives the range and the context that determines where you fall in it.
5. Every calculator has a methodology section at the foot of its page listing exactly what constants it uses, what it assumes, and what it excludes.

What you won’t find here

• Fabricated precision. If a figure is an estimate with a wide range, it’s presented as one. Material densities are not constants and I won’t publish them as though they are.
• Cost figures without a date. Construction pricing moves. Every cost page states when it was last reviewed and what market conditions the numbers reflect.
• Rules of thumb dressed up as code. A rule of thumb is labelled as one. A code requirement is labelled as one. Those are different things, and conflating them is how people get hurt.
• Padding. If a question is answered in two sentences, it gets two sentences.

Who these tools are for

Corrections

If you find something wrong on this site, tell me and I’ll fix it. That includes a formula that doesn’t match a standard, a price that has drifted out of date, a table row that doesn’t compute, or guidance that’s true in general but wrong in your jurisdiction.

Corrections get made to the page and the review date at the foot of that page gets updated. I’d rather be corrected than be confidently wrong in front of someone about to pour a slab.

Get in touch

Corrections, questions about a calculation, or requests for a tool that doesn’t exist yet — I read everything. Use the contact page.

If there’s a calculator you keep needing and can’t find a decent version of, that’s genuinely useful to know. Several of the tools here exist because the alternatives got something important wrong.

Measure & Build is written and maintained by Saqib Javaid. Last reviewed 9 August 2026.