Editorial policy
Exact definitions, not approximations
Every number on Pulgadas a CM comes from the international definitions of the units: 1 inch = 25.4 mm = 2.54 cm exactly, and 1 foot = 12 inches = 30.48 cm exactly. These values were fixed by the international yard and pound agreement of 1959 and are published by NIST and the BIPM. We never use rounded factors such as 2.5 or 0.39 in a calculation.
One engine for every page
The calculator, the tables, the TV sizes and the examples in the text are all produced by the same conversion code when the site is built. A table cannot drift away from the calculator, because both use the same function. The conversion code has automated tests that compare results with values worked out by hand from the definitions, and the build stops if a test fails.
Rounding
We round only for display. Most results show up to 4 decimals, TV widths and heights 1 decimal, and you can choose up to 8 decimals in the calculator. Fractions of an inch are shown to the nearest 1/16 unless you choose another precision, and we say when a fraction is approximate.
TV and screen sizes
Screen width and height are calculated for the 16:9 shape used by modern TVs. Frames and stands differ between models, so we give them as ranges and say so. Check the manufacturer’s data sheet before you buy furniture or a wall bracket.
Reviews and updates
Pages are reviewed when they change, and the “Updated” date on a page shows the latest revision. Translations are written for each language, with the decimal separator and wording people use in that language.
Corrections
If you find a wrong value or a confusing explanation, write to contacto@pulgadasacmcalc.com with the page address and the numbers you expected. We check every report against the definitions and correct confirmed errors.
Advertising
The site is free and is paid for by advertising. Advertisers have no influence on the numbers or the text, and ads are always shown separately from the converter.