Licences and Attributions
The calculators and their text
The calculator engines, page text, design, logo and name are the property of VISIBILITYOS NETWORK LTD. You may use the calculators freely, quote short passages with a link to the page, and embed any calculator on your own website with the embed code shown on its page. Copying the pages, the text or the calculation code to another site is not permitted.
Data sources
Exchange rates: European Central Bank euro reference rates, republished under the ECB's terms. Fuel prices: U.S. Energy Information Administration, public domain. Cryptocurrency prices: CoinGecko, under the CoinGecko API terms, with attribution. Tax tables, health formulas and engineering constants: each calculator lists its own sources beneath the result.
Third-party names
Product, company and game names that appear in calculator titles belong to their owners. They are used only to describe what a calculator does; CalculatorFox is independent of and not endorsed by any of them. Owners may ask for a change through the contact form.
Software
The site is written by VISIBILITYOS NETWORK LTD without third-party front-end libraries; the calculator engines run in your browser as our own code. Server software (PHP, MariaDB, Apache) is used under its respective open-source licences.