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Odhner specialised in pinwheel mechanical calculators, which were invented by Willgodt T. Odhner in St. Peterburg, Russia, in 1874 (a calculator on similar principles was invented independently 2 years earlier by Frank Baldwin in the USA, but the Odhner was the successful design). Following the Russian Revolution of 1917 and the nationalisation of the factory there, production moved to Sweden and the name "Original Odhner" was adopted.

The Odhner was very successful, thousands were manufactured into the early 1970s, and the design was copied and adapted by many companies. The company did not make the switch to electronic calculators.

Kevin Odhner (yes, related to the inventor) has an excellent site with a fascinating history of Odhner mechanical calculators at

An example of an Odhner calculator

Original Odhner

Original Odhner pin-wheel calculator.

This is a featured calculator.

Vintage Calculators

Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.