: Related calculators and inline citations
Every calculator page now links to up to six related calculators, chosen by hand across subjects rather than repeated from the same group. English guides cite their sources inline, and each citation was checked against the cited document.
: Unit converters in 24 languages
All 117 unit converters are now published in all 24 languages, each with a guide written in that language.
: Every calculator in Spanish and Hindi
All 359 calculators are now published in Spanish and Hindi, each with its own guide in that language.
: A guide for every calculator
Every one of the 359 calculators now has a written guide explaining its method, with worked examples and sources, up from 26 extended guides at launch.
September 27, 2026: CalcOpenly launch
Published 359 calculators across twelve subjects, including 89 dedicated unit conversions and 26 extended guides. Each calculator includes its method, sources and checked worked examples.
- Mortgage payments, refinance comparisons and loan EMI.
- BMI and daily energy estimates, with method limitations.
- Concrete quantities and delivery comparisons and elapsed hours across daylight-saving changes.
September 27, 2026: Search and transparency update
Adopted the CalcOpenly name and www.calcopenly.com address. Added privacy, terms and contact pages, optional analytics controls, more guidance on choosing calculators, and clearer directional conversion examples. The Earth and weather hub now lives at /earth; old /misc links redirect there.
Future method changes and corrections will be added here with their publication date. To report a problem or suggest a calculator, contact the maintainers.