About & licences
Colophon
ExactBench is a set of engineering calculators built and maintained by a
working mechatronics engineer, because the existing ones are mostly lead generation for board
fabricators or wrapped in advertising.
How the numbers are checked. Every formula cites the standard it implements, and the
page shows the working rather than asking you to trust a number. Where a formula is written by
hand it is tested against a separately derived implementation rather than against itself:
the half-precision float encoder, for instance, is checked against a brute-force reference that
enumerates every finite half value and every midpoint between adjacent values, because
round-half-to-even errors only show up at the ties. Exact decimal values and rounding errors are
computed with arbitrary-precision integers, not in floating point — measuring the error of
floating point in floating point would be circular.
No warranty. These tools are design guidance, not a substitute for your own engineering
judgement, your fabricator's capabilities, or the applicable safety standards. Verify anything
that matters before you commit it to a design. Mistakes are possible and corrections are
genuinely welcome.
What is not collected. This site sets no cookies, runs no advertising, and loads nothing
from a third-party host — no fonts, scripts, or trackers fetched from anywhere else. There is no
sign-up and no personal data is requested or stored. Cloudflare, which serves the site, keeps
aggregate traffic statistics in the ordinary course of hosting it. Calculations run entirely in
your browser and are never sent anywhere; the values in a shared URL are simply the numbers you
typed.
Standards and trademarks. IPC-2221, IEEE 754 and the other standards named on this site
are the property of their respective organisations. ExactBench implements and cites
published relations from them; it is not affiliated with, endorsed by, or certified by any
standards body. Mathematical relations themselves are facts and are not subject to copyright —
the standards documents that describe them are, and none of their text is reproduced here.
Typefaces. IBM Plex Sans and IBM Plex Mono, copyright © 2017 IBM Corp, and Space Grotesk,
copyright © 2020 The Space Grotesk Project Authors. Both are used under the
SIL Open Font License 1.1
(
Space Grotesk licence), which is
distributed alongside the font files as that licence requires.