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Free Converters & Calculators Calculators

Free online converters for number bases, units, data sizes, date/time, and Roman numerals. No signup, all in your browser.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal bases.

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Universal Unit Converter

Convert length, weight, temperature, and more between metric and imperial units.

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Data Size Converter

Convert digital storage sizes like bytes, KB, MB, GB, and TB.

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Date & Time Calculator

Calculate the exact duration between two dates or add/subtract time.

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Roman Numeral Converter

Convert integers to Roman numerals and vice versa.

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