An easy-to-use computer program, hosted in the public domain on the Internet at https://owlcalculator.com/, that facilitates routine calculations. Unlike conventional pocket or desktop calculators, which are electronic devices for performing arithmetic operations, the term online calculator is widely used to refer to web pages that perform specialized calculations, such as calculating the cost of a loan or calculating the distance between two points on the surface of the Earth. Calculations in the traditional style for electronic calculators are also possible with the help of mathematical online calculators, having relatively large display powers, such as displaying graphs, tables, mathematical formulas, the calculation performed by an online calculator wins in terms of perception.