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Welcome to the Conversion House

The Great British Converter

From Bytes to Barleycorns: The Ultimate Imperial & Metric Converter

Nine unit converters, an archive of over 250 historical measures, and the stories behind how Britain came to reckon the world.

Explore the ConvertersThe Measurement Archive
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The Daily Pub Quiz

Five questions on old currency, odd volumes and forgotten laws. Today’s set is waiting.

British measurement history is a blend of Roman inheritance, royal decree and gradual modernisation. The Weights and Measures Act of 1824 unified centuries of traditional English units into the imperial system, and much of it is still in daily use. This site converts those measures accurately into modern metric equivalents, and tells the stories behind how they came to be.

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Unit Converters

Imperial & Metric
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Calculators & Finders

Practical Tools
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Historical Curiosities

Shareable Insights
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The Imperial Arcade

Interactive Simulators

Over 250 historical units

Every unit with its history, its modern equivalent, and the trade that gave rise to it: the fisherman's cran, the collier's corf, the surveyor's oxgang and the apothecary's scruple.

Browse the Measurement Archive

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