CATEGORY
Online Converters
Free online converters: units, temperature, currency, time zones, number bases and Roman numerals.
Conversion is really translation — same value, different language. The trap is never the arithmetic; it is the hidden rules: the imperial gallon vs the US one, daylight saving shifting time zones, shoe systems disagreeing by brand.
These converters handle the arithmetic and the traps, using internationally defined factors and showing every unit at once — because usually you want the answer in more than one language.
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Unit Converter
Convert between length, weight, volume and other common units.
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Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin.
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Time Zone Converter
Convert times between different time zones around the world.
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Number Base Converter
Convert numbers between binary, decimal, hexadecimal and octal.
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Roman Numeral Converter
Convert Roman numerals to numbers and numbers to Roman numerals.
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Currency Converter
Convert between USD, EUR, GBP, BRL, INR and other major currencies with live reference rates.
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Shoe Size Converter
Convert shoe sizes between US, UK, EU and centimeters for men and women.
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Length Converter
Convert length and distance units instantly: cm to inches, meters to feet, km to miles — see all units at once.
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Weight Converter
Convert weight units instantly: kg to lbs, pounds to kg, grams to ounces, stones and tons — all units at once.