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Conversion Calculators

All conversion calculators, free and private.

5 calculators

Currency Calculator

Convert between 25 world currencies with an exchange rate you control.

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Unit Conversion Calculator

Convert length, weight, temperature, area, volume, speed, time and data.

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Roman Numeral Converter

Convert numbers to roman numerals and back, up to 3,999.

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Shoe Size Conversion

Convert shoe sizes between US, UK, EU and CM for all ages.

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Conversion Calculator

15 categories of unit conversion, all offline.

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Private by design

Your data never leaves your device.

Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.

  • 100% local, client-side calculations
  • No data stored on any server
  • No tracking, no analytics, no ads scripts
  • Works offline once loaded