Methodology
These tools were built to support professional work, so they are built differently from an ordinary calculator. This page explains what sits behind them, what they do, and what they do not.
A formula that can be coded is not a formula that can be published. A tool goes live only when the values it rests on — thresholds, coefficients, tables and classifications — come from a document we hold and can point to. A tool without such a source is not given estimated values to fill the gap.
What that means in practice: a number shown by a tool is a number with a source, not an estimate that looks reasonable.
Some tools on this site are marked as previews. Their engine is built and tested, but the standard or document that fixes the numeric values is not yet in our hands. In that state the tool shows the method and the working, and where a regulatory value would be there is a dash — not a number.
The safeguard here is deliberate: a half-sourced tool presented as finished is more dangerous than one that does not exist, because it looks reliable.
Every blocked tool names the exact document needed to release it and what is needed from it. No date is promised, because none is known.
The set of rules behind a regulatory tool carries a version identifier, and that identifier is recorded in any report the tool produces. If the rules are updated later, it stays possible to see which version a calculation was made against — rather than having to guess.
That matters most in dealings with an authority: an answer given a year ago was checked against what was correct then, and that can be shown.
A report produced by a tool does not change afterwards. It records the values entered, the result, the rule version and the language it was issued in, and it holds them. Changing display settings, or switching between Hebrew and English, does not alter a report that has already been issued.
A report sent to a third party has to remain what was sent. That is why the freeze covers the language as well.
The tools support professional work. They do not replace review by a competent professional, a site inspection, measurement, or approval by a statutory authority. A tool's result is a starting point for a check — not an approval, not an opinion and not a permit.
Any tool that produces a result can send that calculation, together with the values entered, to Hoshen for professional review.
The engine that calculates does not know which language the site is being read in. Calculations, thresholds, rule versions and stored values are identical in both; what changes is the wording shown to the reader.
Official names of Israeli regulations, forms and documents stay in Hebrew on English pages too, because a translation of them is not a citation of anything.
Values entered into the tools are kept in your browser and are not sent to Hoshen. They leave your machine only if you explicitly choose to attach a result to an enquiry and send it — and you are shown exactly what is attached before it goes.
There are no accounts, no sign-up and no customer database behind these tools.
You can send a result from a tool, or get in touch directly and describe what you need.