Non-Decimal Calculators

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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 inches, and it is possible to buy new electronic pocket calculators which operate in these units.

Featured on this site are:

Click on a picture below to go to the section with examples of that type of calculator.

Sterling Currency (£sd) Calculators

Sterling currency calculator
Sterling Addiator
Odhner Lusid

Indian Currency Calculators

Length Calculators

Feet & inches Addometer
Feet & inches Addometer

Imperial Weight Calculators

Weight calculator
Weight calculator

Time Calculators

Time calculator

Angle/Time (minutes/seconds) Calculators

Addiator Astro

Octal & Hexadecimal Calculators


Vintage Calculators

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