About Convertfig

Convertfig is a small, independent set of free converters for everyday figures: oven temperatures, shoe sizes and Roman numerals. It has US, UK and Australian versions, each with its own spelling, units and date order.

Convertfig is run by JB, an independent publisher based in Australia. Questions or corrections: hello@convertfig.com.

How the converters are checked

Each page shows the date its sources were last checked and links to them. Oven gas marks follow the Which? table, with the quarter and half marks from Wikipedia. Shoe sizes are built from one rule set (foot length, the barleycorn for UK and US sizes and the Paris point for EU sizes) and compared against published charts. Roman numerals follow the standard rules, and an invalid numeral gets a plain reason.

Some values are editorial rules of thumb rather than standards, such as the 20 °C fan reduction, the 25 °F convection rule and the foot allowance in shoe sizes. These are labelled where they appear, and each one can be edited. Where reputable sources disagree, for example Australian shoe sizes or gas mark 3, the page says so. Every formula has automated tests with worked examples.

Convertfig is not affiliated with any oven, shoe or clothing brand, retailer or recipe publisher. Where a page names an organisation, it is only to say where a figure came from.

A guide only

Conversions are estimates. Ovens vary, so check the recipe and use an oven thermometer. Shoe sizes vary by brand, so check the brand’s own chart. Nothing here is safety, food-safety or fitting advice.

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Corrections

If you spot an out-of-date figure or a mistake, please let us know.