Corrections and changes
What we got wrong, what we removed and what we fixed, newest first
How this page works
When a tool shows a wrong number, a figure goes out of date or a page breaks, we fix it and write it down here instead of changing things quietly. Only substantive changes are listed, not typos or wording tweaks. Dates are given by month because fixes go live in batches.
October 2026
12V example, concrete factor and new sources
The worked example of the 12V wire calculator said 10 mm² is about 8 AWG, while the tool itself shows 6 AWG for that case, because 8 AWG is only 8.4 mm² and would be too thin; the text now matches the tool. The concrete calculator gave its dry-volume factor as “often 1.52–1.57”; the sources we found give 1.52 to 1.54, so the range was narrowed and two sources were linked. Three tools also gained sources we opened and checked: Bridgestone for the rule of about 1 psi per 10 °F (cold-weather car check), and the European Commission page on the energy label for the European SEER (inverter air conditioner payback).
October 2026
Older calculators now refuse impossible values
A stress test of every tool found that 19 of the older calculators accepted values outside their own limits and still showed a result: negative paint quantities, a wire size for a negative current, tile costs for a negative area, or figures so large they were meaningless. These calculators now mark the field in red, explain the accepted range under it and keep the last valid result until the value is fixed. The PDF tools also show a plain message when a file is damaged, instead of a technical error.
October 2026
Privacy Policy and category pages corrected
The Privacy Policy said the PDF merge and split tool downloads its code from unpkg; that tool now uses a copy hosted on this site, so the mention was removed. Several category pages also described an older line-up: the Wellness page still listed the exact age calculator, which moved to Life & Admin, and the PDF page said text recognition (OCR) cannot run in the browser, although our Image Text Extractor does exactly that. Their descriptions now match the tools they list.
October 2026
The www address now redirects to the main address
Until now, www.sosimple.tools served the same pages as sosimple.tools without redirecting, so search engines saw two copies of every page (the canonical tag already pointed to the main address). A permanent redirect was added: any www address now sends you to the same page on sosimple.tools, keeping the path and any query string.
October 2026
Sources checked for resin, 12V wire and inverter AC
The resin exposure calculator called the working-curve equation “derived from Beer–Lambert light absorption”, which the sources we read do not say; they describe it as a semi-empirical model, so the text was changed and two sources are now linked. The 12V wire page now links the ABYC page that states the 3% and 10% voltage-drop limits. The inverter AC page named the EN 14825 standard, which we could not confirm in the sources we read, so the mention was removed.
October 2026
Overlapping tools merged
Fuel Consumption & Monthly Cost was merged into the Fuel Cost calculator, which now has three modes (daily commute, monthly total, single trip with tolls and parking) and accepts km/L, L/100 km and MPG. Relationship Time & Anniversary was merged into Exact Age, which now has an Age mode and a Time together mode with the traditional anniversary names and the progress to the next one. The old addresses redirect to the merged tools.
October 2026
Fewer, better-matched product links
Product cards were removed from 17 tools where the items had little to do with the task (text, developer and conversion tools such as the word counter, JSON formatter and timestamp converter). On the other tools they now appear after the guide and methodology instead of right below the calculator. A joint supplement was removed from the dog and cat age calculator, and descriptions that called products “highly rated” were rewritten, since we do not test or rate them.
October 2026
Two tools removed, two renamed
The receipt generator was removed: a tool that prints receipts with any logo and signature is too easy to misuse. The mattress firmness calculator was removed because its recommendation came from a retail lookup table we could not trace to a published source. The quick IQ and logic test is now the Logic Puzzle Quiz, since ten puzzles cannot measure IQ; it gained 10 new puzzles and an explanation for every answer. The certificate maker’s addresses in French, Spanish and Portuguese no longer use the word “diploma”. Old addresses redirect to the new pages.
October 2026
Car depreciation: your own car’s numbers
The calculator only offered generic yearly rates, which are illustrative assumptions rather than market data. It now starts in a mode that uses what you paid, what the car is worth today and its age to work out your car’s own yearly rate, then projects that rate forward. The generic mode is still available and labeled as such.
October 2026
12V wire size: AWG sized on its own area
In metric mode the result showed the chosen size with the nearest AWG beside it, for example 10 mm² next to 8 AWG, although 8 AWG is only 8.37 mm². The AWG shown is now chosen by its own cross-section and current check, so it is never smaller than the circuit needs.
October 2026
AC BTU calculator: US government rule and ENERGY STAR adjustments
The base of 240, 400 or 600 BTU per square meter was this tool’s own approximation. The calculator now uses the US Department of Energy rule of 20 BTU per square foot (about 215 BTU per m²) with the ENERGY STAR adjustments: ±10% for shade or sun, 600 BTU per person beyond two, 4,000 BTU for a kitchen and rounding down to the nearest thousand. The allowance for electronic devices, which no source supported, was removed. A comparison box shows the Bosch and Brazilian retail rules for the same room. In the non-English pages the default room was 215 m² instead of 20 m²; that is fixed.
October 2026
Privacy policy made specific: third-party hosts, donations and retention
The policy said that some libraries, such as styling scripts, were loaded from third-party networks. That was out of date: the site’s styles come from our own domain, and what third parties really provide is code libraries or AI model files for four tools (QR code, PDF merge and split, image text extractor, background remover). The policy now names those tools and hosts and says what the hosts can and cannot see. It also says that Ko-fi shows us a donor’s name, email address and message, gives concrete retention periods (12 months for the cookie choice and for emails, accounting rules for donation records), notes that Cloudflare publishes no fixed retention period for site logs, and names the complaint authorities for Portugal, the United Kingdom and Brazil.
October 2026
A real choice in the cookie banner
The old banner had a single “Got it” button, so there was no way to say no, and the policy promised that ads would load only after acceptance. The banner now offers Accept all, Reject all and Customize with the same prominence, keeps advertising off until you allow it, remembers your choice for 12 months and can be reopened at any time from “Cookie settings” in the footer. The site loads no advertising or analytics scripts today. The privacy policy was updated to match, including that some product images are loaded from Amazon’s servers.
October 2026
AC BTU calculator: sizing now closer to international guidance
The calculator used 600, 700 or 800 BTU per square meter, a retail rule of thumb common in Brazil, which gives noticeably larger units than guidance such as ENERGY STAR’s for a typical room. It now uses 240, 400 or 600 BTU per square meter (the top setting is meant for sunny rooms in hot climates), adds 600 BTU only for occupants beyond the first two, as ENERGY STAR does, and offers sizes from 5,000 BTU. Typical bedrooms now come out smaller than before. It is still a rule of thumb, not a heat-load calculation.
October 2026
12 V wire size calculator: AWG is no longer treated as equal to the metric size
The tool paired 10 mm² with 8 AWG, but 8 AWG is only 8.4 mm², so a reader choosing by AWG could end up with a larger voltage drop than the limit they had set. In AWG mode the tool now sizes by the real AWG area, and next to a metric size the AWG is shown as an approximation (≈). The page also said that ABYC E-11 assumes 105 °C insulation, which we could not confirm from the source we had opened; it now cites West Marine’s guide for that.
October 2026
Source attributions corrected on six tools
While checking every source link we found statements that the source did not make. The inverter AC page linked a rule about commercial three-phase equipment instead of the residential SEER2 test procedure. The FIRE page cited the 1998 Trinity article but linked the authors’ 1999 follow-up. The due-date page credited ACOG Committee Opinion 700 for the 280-day convention and the ultrasound thresholds, which the page we had opened does not say; it now cites StatPearls, and ACOG 579 for the definition of full term. The BMR page named the Academy of Nutrition and Dietetics as author of a 2005 review that was published by researchers in the Journal of the American Dietetic Association. The concrete page called 1.52–1.57 an engineers’ figure; it is now labeled a rule of thumb. The solar page said its loss range was “in line with” NREL’s PVWatts; it now states what the PVWatts defaults imply (about 82.5% overall). The US SEER range on the inverter page was widened to 9–30.
October 2026
Tipping data brought up to date
The tip calculator quoted Toast’s restaurant data for the first quarter of 2026 (19.3% on full-service bills). Toast has since published the second quarter: 19.1% for full-service and 15.8% for quick-service. The text now uses the newer figures, and the page shows the date it was last checked.
October 2026
Broken numbers on three calculators
A test in a real browser found three tools that could show NaN or Infinity when a field was cleared or filled with an impossible value: the Price vs SAC loan comparison (very long terms), the gutter size calculator (an empty roof area showed “Infinity%”) and the headphone power calculator (a negative impedance). Each now shows a dash until the inputs are valid, and where a tool has a copy button, it does nothing while there is no result.
October 2026
Share buttons on the loan comparison page, and names for screen readers
On desktop, the Price vs SAC page had no WhatsApp, X or copy-link buttons because part of its code had never been finished. We added them. On nearly every other tool the three share icons had no text name, so screen readers announced them as unlabelled buttons. They are now called WhatsApp, X and Copy link.
October 2026
Phone layout fixes
On narrow screens, the unit selectors of the fuel cost calculator, the trip rows of the Schengen calculator, the footer links on some German pages and wide tables inside the worked examples pushed the page sideways. They now wrap or scroll inside their own box. The gutter calculator also showed the English labels “(Metric)” and “(US)” in every language; the toggle now reads just m² and sq ft.
October 2026
Product cards without hand-typed ratings
Some affiliate product cards carried star ratings and review counts that had been typed in by hand. Amazon Associates rules do not allow ratings shown that way, and they could not stay accurate, so we removed them. A card now shows only a product name, a short description and the link.
September 2026
Net salary calculator removed
It depended on tax rates and contribution tables that change every year and differ by country, and we could not promise they would stay correct. We removed the tool and its pages rather than keep numbers that might be out of date.
Found something we missed?
Write to us with the page address and what looks wrong. Confirmed errors are fixed and added to this list.