# Calculator

OnCalc.com is a free online provider of calculators and converters. In this website you will find high quality tools that can substitute formulas or mathematical processes. Here you can make online conversions for many measurement systems and calculate any formula!

All our content is completely free and we do not warrant that any tool of this site is accurate or precise enough to be used as a base for something. The calculators on this site are for reference only, professionals in their respective areas should be consulted to finding the result of a more accurately.

### Online Calculator

You can also use this Calculator.

## Calculator – The History

The Abacus, earliest known instrument used in the aid of arithmetic calculation, was devised in Egypt in 2000 BC. A modern development was the slide rule, developed around in the 1620s by Edmund Gunter in the United Kingdom.

In 1957, IBM released the first viable all-transistor project, the IBM 608, even if it was housed in numerous cabinets.

Nowadays computers frequently come with a calculator utility program that emulates the appearance and functionality of calculators. Most smartphones also have such a feature.

The original hand held calculator was developed by Texas Instruments,an American company based in Dallas, Texas, United States; in 1967. It could add, subtract, multiply and divide; its output device was a paper tape, unlike the current standard calculator.