About this site
About ConstructionCalc
ConstructionCalc is a hub of free construction, landscaping, and home-improvement calculators with sourced data and transparent methodology. We compute every cost from public primary data rather than copying it from competing aggregators — and we show our work.
Founder
About the author
Marko Visic
BSc Physics · University of Ljubljana, Faculty of Mathematics and Physics
I'm Marko Visic, a physics graduate (University of Ljubljana) who builds the technical tools I needed myself. ConstructionCalc started when my wife and I bought a house and planned a full renovation — new driveway, a patio, knock out this wall, build that one. Trying to budget the concrete, materials, and labour, I ended up building calculators in Excel just to know what we'd really pay.
It struck me that anyone doing their own construction needs the same thing — so I rebuilt those calculators here, properly. The goal is simple: help you DIY it, or at least walk into a contractor's quote already knowing the numbers, so nobody can take advantage of you.
The physics-graduate approach is the same one that drives the tool design: each calculator cites its sources and shows its method, and where cost matters we escalate from primary data (live material-cost indexes) rather than copying someone's blog figure. If a number on the site looks off, email info@constructioncalc.org and I'll trace it to source or fix it.
Every figure on this site is computed from a named source or left out — no made-up averages.
Who runs it
Operator
The site is operated by Moving Data Systems, digitalni marketing, d.o.o., a Slovenian limited liability company registered at Smolnik 62, 2342 Ruše, Slovenia. Slovenian business registry number (matična) 9041273000, VAT identification number SI94001154. The company is the publisher and the GDPR controller for the site. For any question that needs a human, email info@constructioncalc.org.
We do not invent staff biographies or list a fictional “expert team.” The accountable entity is the company, and the editorial direction comes from it.
What we do
Mission
Construction and landscaping calculators on the open web are mostly thin: a single number, no source, no math, and a price quoted to the cent that the data cannot support. ConstructionCalc sets out to be the opposite — a small library of tools that are accurate, sourced down to the publication and base period, and free to use, with imperial and metric units in lock-step.
We publish what we can compute from public data, and we say so when we cannot. We decline categories where the only credible answer is “ask a local contractor who has seen the site.”
How we get the numbers
Compute, not copy
Volume math is geometry plus a small set of stable engineering constants — ft³ to yd³, coverage per yard at a given depth, the density of ready-mix concrete, the unit weight of ASTM A615 rebar, the size of a USG drywall sheet. Cost math is a researched dollar anchor (a USGS Mineral Commodity Summaries value) escalated to the current month using the change in a named Producer Price Index series via the FRED API.
We do not use, paraphrase, or resurface data from RSMeans, Homewyse, HomeGuide, or Angi. The full methodology — formulas, pinned source identifiers, the PPI-as-escalator mechanism, the honest live-vs-frozen fallback — is documented on the methodology page.
Accuracy
Accuracy commitment & corrections
Every figure on the site traces to a named primary source or to a calculation shown on the page. If a number is wrong, it gets fixed and the page is dated. The route to report a correction is the same as the route to reach the company: email info@constructioncalc.org with the page URL and what you saw. Read more in the editorial policy.