Who is behind this

Why these tools exist

Because we kept needing them, and because what is already online is often worse than nothing. A great many glass and glazing calculators on the web give you a single number with no formula, no standard, no assumptions and no indication of what they left out. Some of them are simply wrong. Others are correct but useless, because you cannot tell whether the answer applies to your case.

The rule we set ourselves is the whole product: if we cannot show you the working, we have not finished the tool. Every page prints the formula, the coefficients it used and the standard it came from, next to the answer. Every page has a section saying what it does not do. If you disagree with a result, you have everything you need to prove us wrong, which is the only kind of trust worth having in engineering.

Why they are free

Because they are not the business. HU Ingenieros makes its living from custom software and from the ERP systems it installs and maintains — over a hundred companies run them. These calculators cost us very little to publish and they are genuinely useful, so there is no reason to put a gate in front of them.

There is exactly one paid thing on this site, and it is deliberately small: the specification sheet can be printed without our name on the footer, so the document you hand a client is entirely yours. That is the only paid extra, it is a one-off, and every calculator stays free with or without it.

How each tool is checked before it goes up

• A worked example on every page, verified against the code. The numbers in the "worked example you can check by hand" block are not typed by us from a textbook — they are checked against what the page actually computes, and they have caught real mistakes.
• The standard is named, not implied. EN 16612, EN 1991-1-4, ASCE 7, EN 673, EN ISO 10077-1, EN ISO 6946, EN ISO 13788, EN 12831 and the rest are printed on the page that uses them, so you can go and read the clause.
• National values are flagged as national. Barrier loads, wind maps and design temperatures differ by country. Where we have used one country's annex, the page says so and tells you to check your own.
• Nothing you type is uploaded. Every calculation runs in your browser. There is no account, no server-side maths, and no input of yours reaches us — which also means we cannot help you recover it.

If you need software rather than a calculator

Writing it is what we do for a living, and glass companies are what we know best. There is a page about that — what we build, who it is worth a conversation with, and a straight answer about why the ERP is in Spanish.

What we do load, said plainly

A site that makes a privacy claim its selling point ought to disclose what it loads, so: these pages carry Cloudflare Web Analytics — a few hundred bytes recording that a page was viewed and how fast it loaded, with no cookies and no fingerprinting — and Google Analytics, which is the one thing here that would set cookies and is therefore the one thing we ask you about. It loads with consent denied by default, so unless you press Allow it never stores an identifier.

From Analytics we record four events and no more: a calculator was used, a document was printed, the buy button was clicked, a payment completed. Not one of them carries a value you typed. We learn that the cutting optimiser was used; we never learn your sheet size, your cutting list or your customer, because those numbers are never handed to the tracker in the first place and never leave your machine at all.

We keep both for one reason: they are the only way we know whether any of this is being used. Beyond them there is nothing — no tag manager, no advertising pixel, no session recorder, no chat widget, no third-party fonts, and Google's advertising signals are switched off rather than left at their default. The privacy page spells all of it out, including the file you can read to check that the four events are the four events.

What this is not

We are software engineers who have spent a long time inside the numbers of the glass trade. We are not a structural or building-physics consultancy, and nothing on this site is a signed calculation. These are pre-dimensioning and screening tools for people who already know the subject: they are for deciding what to specify, for checking whether a quoted figure is sane, and for understanding where a number comes from.

Before anything is ordered, built, or submitted to an authority, it needs the responsible engineer's own calculation against the code that actually applies to the project. Every tool here says the same thing in its own words, and we mean it.

Contact

If a result looks wrong, we would genuinely like to know — a specific input and the number you expected is worth more to us than a compliment.

huingenieros.com is in Spanish; SyntaxFlow is in English on purpose, because the standards and the audience are.