Localisation and Measurements

Measurement units are one of the most practically significant — and frequently overlooked — aspects of localisation. A product description listing dimensions in inches, a recipe using cups and ounces, or a weather widget showing Fahrenheit will all feel foreign or confusing to users in markets that use the metric system. Getting units right is not a translation problem; it is a localisation one.

The divide is most visible between the United States and most of the rest of the world. The US uses the imperial system throughout: distances in miles, heights and dimensions in feet and inches, weights in pounds and ounces, temperatures in Fahrenheit, and volumes in fluid ounces and gallons. The UK uses a hybrid — road distances and speed limits in miles, body weight in stone and pounds, beer served in pints — but most other measurements in metric. Every other major market uses metric: kilometres, kilograms, Celsius, and litres.

The same quantity expresses very differently across systems. Five miles becomes eight kilometres. Seventy degrees Fahrenheit becomes twenty-one Celsius. A twelve-ounce can holds 355 millilitres. A six-foot person is 183 centimetres tall. A one-acre plot is 0.4 hectares. For any content that contains real-world measurements — product specs, fitness apps, cooking content, travel guides, weather, mapping — these conversions are a mandatory part of localisation, not optional polish.

Clothing and shoe sizes add another layer of complexity. A US size 10 shoe is a UK 9.5 and a European 44. Women's dress sizes follow completely separate scales across US, UK, and EU conventions. Paper sizes differ too: North America uses Letter (8.5 × 11 inches) and Legal formats, while the rest of the world uses the ISO 216 standard — A4, A3, A5, and so on. Software that references paper sizes in print dialogs or help content needs these adapted per locale.

Measurement localisation also intersects with number formatting. The decimal separator varies by region, so '1.5 km' in English becomes '1,5 km' in German and French. A string like '1,500 lbs' could be misread in a locale where the comma is the decimal marker rather than the thousands separator. Language Monster surfaces strings containing numeric values with units so they can be reviewed and adapted as part of the localisation workflow — rather than missed in a bulk translation pass.