Reference data
Some conversions turn on a table rather than a factor. 8 of those tables live here, each on a page of its own with its sources, an open licence and an embed, so they can be cited and reused instead of copied out of the middle of a converter page. Every derived column is computed at build time from the sourced columns beside it.
EU nutrition label energy conversion factors (Annex XIV)
Annex XIV of Regulation (EU) 1169/2011 with the implied kJ per kcal and its gap from 4.184 worked out for every nutrient.
Decimal versus binary byte units, with the gap calculated
The full KB to EB ladder against KiB to EiB, with the gap at every rung and what each advertised drive size reports.
The three horsepower definitions, with the gap between them calculated
Metric PS, mechanical hp and electrical horsepower in exact watts, with the gap between them and a 300 unit rating restated in each.
The three calorie definitions, with a day's intake worked out in each
Thermochemical, International Table and 15 degree calories in joules, with a 2,000 kcal day costed in each and the spread between them.
CSS absolute length units, anchored to 1in = 96px
px, pt, pc, in, cm, mm and Q against the spec anchor 1in = 96px, with every unit worked out in pixels and millimetres.
ISO 216 and US paper sizes, with aspect ratio and area calculated
A0 to A6 plus Letter, Legal and Tabloid in both millimetres and inches, with the aspect ratio and area worked out for each.
Temperature scale fixed points in Celsius, Fahrenheit, Kelvin and Rankine
Absolute zero, freezing, boiling and the body reference on all four scales, with every non-Celsius figure calculated by formula.
Mbps against MB/s, with download times calculated
Common line speeds with the factor of eight made explicit, plus the time each one needs for a 1 GB, 10 GB and 50 GB file.
How these pages are built
Every number on a reference page is computed at build time from the same module the converter pages read, so the two can never disagree. Derived columns, such as the gap between a legal conversion factor and the physical one or the difference between a decimal and a binary unit, are calculated from the columns beside them rather than typed in, which is what makes them worth citing.
Each page names its sources and states exactly what each source is being cited for. Where the underlying data carries its own terms, as EU legislation does, those terms are stated alongside ours rather than glossed over.
Licence
The tables as compiled here, including every calculated column, are published under the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Copy, adapt and republish them freely, commercial use included, as long as you credit UnitGlide, https://unitglide.net. Each page carries a ready-made embed that keeps the credit attached for you.