A euro calculator is a very popular type of calculator

Calculator

An electronic calculator is a small, portable, usually inexpensive electronic device used to perform the basic operations of arithmetic. Modern calculators are more portable than most computers, though most PDAs are comparable in size to handheld calculators.The first solid-state electronic...

 in European countries (see eurozone

Eurozone

The eurozone , officially called the euro area, is an economic and monetary union of seventeen European Union member states that have adopted the euro as their common currency and sole legal tender...

) that adopted the euro

Euro

The euro is the official currency of the eurozone: 17 of the 27 member states of the European Union. It is also the currency used by the Institutions of the European Union. The eurozone consists of Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg,...

 as their official monetary unit. It functions like any other normal calculator, but it also includes a special function which allows one to convert a value expressed in the previously official unit (the peseta

Spanish peseta

The peseta was the currency of Spain between 1869 and 2002. Along with the French franc, it was also a de facto currency used in Andorra .- Etymology :...

 in Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

, for example) to the new value in euros, or vice versa. Its use became very popular within in the population and commerce of these countries especially during the first few months after adopting the euro.

As so many were produced, they are also found outside the eurozone to help staff with conversions at airports or railway stations where the euro has a strong presence.