Calculators we built because we needed them. Each one runs entirely in your browser — nothing is uploaded, nothing is stored, and none of them asks for an email address.
Lookups rather than calculations — the things you need mid-task and would otherwise search for, with the assumptions each conversion depends on stated rather than hidden.
Tools that have nothing to do with circuit boards, kept here because they are genuinely useful and carry no advertising, no email capture and no tracking — which is more than can be said for most of what comes up when you search for them.
The safety tools follow the order a real project meets them. You start with a hazard and need an integrity level: that is ASIL determination. You have an integrity level and need to know whether one part can reach it: that is the FIT and PMHF budget calculator. You have several parts and need the system answer, plus a sense of which one is spending your budget: that is the FMEDA rollup. And when the question is about process and effects rather than failure rates, FMEA action priority triages what to work on first.
The board FIT calculator is the bridge between the two halves of this page: it turns a bill of materials and a mission profile into the failure rate the safety tools consume.
On the board side, PDN target impedance answers the question that decides most decoupling arguments — how low does the impedance have to be, and how many capacitors does that take — and the decoupling impedance plot then shows you the anti-resonant peaks that the first answer is blind to. Via stub resonance settles whether a link needs backdrilling, and the buck converter calculator sizes a power stage without steering you to anyone's part number.
What these are for, and what they are not
Every one of them is a budgeting and sensitivity aid. They are built to give you the right order of magnitude quickly, and — more usefully — to show you which input your answer is actually sensitive to. That second thing is normally worth more than the number, because it tells you where to spend effort.
None of them is evidence. A calculator cannot produce an FMEDA, an FMEA, or PDN sign-off, and no assessor or certification body will accept one as a work product. Where a tool simplifies something that matters — anti-resonance in a capacitor bank, dependent failures in a safety analysis, the difference between our transparent FMEA precedence rule and the AIAG-VDA handbook table — each page says so plainly rather than leaving you to find out later.
They also deliberately avoid ground that is already well covered. There are good free impedance, trace-width and current-capacity calculators elsewhere, and we saw no reason to build worse copies. These fill the gaps we kept running into instead.
If the numbers are not landing
FMEDA and FMEA review, and signal and power integrity work, are two of our primary service lines. If a tool here is telling you something you do not like, the usual next step is a fixed-scope review — one to two weeks, ending in a written report you keep whether or not the work continues. The packages are listed with their scope and duration.
We add tools here fairly often and write up the things worth writing up — a stackup that behaved oddly, a standard that turned out to be obsolete, a calculator that was quietly wrong. Join and you get told when something new lands.
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