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There was a requirement for non-decimal calculators for performing calculations with Sterling currency (Pounds, Shillings, Pence), Imperial length measurements (Yards, Feet, Inches), and Imperial weight measurements
(Hundredweights, Quarters, Pounds).
Most of these were only produced as mechanical calculators since there was a great movement towards decimalisation in the 1960s and 1970s in the countries that were using these systems.
However the U.S.A. still makes great use of length measurements in feet and inehes, and it is possible to buy new electronic pocket calculators which operate in these units.
Click on a picture below to go to the section with examples of that type of calculator.
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