About kalkuleyt
kalkuleyt is a free calculator site for everyday decisions, published in five languages.
What kalkuleyt is
kalkuleyt brings together 86 calculators for finance, health, math, construction, conversions, dates and engineering. Every tool is free, requires no account, and is built around a documented formula or a named data source.
Who it is for
The site is for people making practical calculations: comparing loan offers, checking a dosage-free screening estimate, estimating paint or concrete, converting units, or working through a homework problem. Each page states what the tool calculates, how to use it, and what it does not cover.
How calculators are built and maintained
Formulas come from established references and are printed on the page so results can be checked. Calculation logic is covered by automated tests, including edge cases such as zero rates and invalid inputs. When a formula, source or explanation changes, the page is updated.
Languages
English is the source language; Turkish, German, Spanish and Portuguese pages are localized versions of the same tools. If a translation is unclear or wrong, tell us and it will be corrected.
Methodology, sources and corrections
Each calculator has a Methodology & data section that names its method and, where relevant, its sources. The site does not invent citations and does not claim professional medical or financial review. Errors can be reported through the contact page, and the corrections policy explains how reports are handled.
Advertising
kalkuleyt is funded by display advertising. Ads are never placed inside calculator inputs, results or buttons, and advertising does not influence any calculation or ranking on the site.
Important note
Results are estimates for information only and are not financial, medical, legal, tax or professional advice. Confirm important decisions with a qualified professional or the relevant official source.