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Free Online Converters & 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 values between binary, octal, decimal, and hexadecimal number bases.

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Unit Converter

Convert common length, weight, temperature, and volume units between metric and imperial systems.

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Data Size Converter

Convert bits, bytes, decimal KB/MB/GB, and binary KiB/MiB/GiB without mixing conventions.

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Date Difference Calculator

Find the days between two dates or add and subtract a number of days from a date.

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Roman Numeral Converter

Convert standard numbers to Roman numerals and Roman numerals to numbers with this translator tool.

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Which online converter do you need?

The unit label matters. Pick the converter that matches the kind of value you have, then check the source and target units before using the result in a technical or financial context.

  • Unit converter

    Convert common length, weight, temperature, and volume units such as kilometers to miles or kilograms to pounds.

  • Data size converter

    Compare bits, bytes, decimal KB/MB/GB, and binary KiB/MiB/GiB without mixing 1,000 and 1,024 conventions.

  • Number base converter

    Translate values between binary, octal, decimal, and hexadecimal representations.

  • Date difference calculator

    Find days between dates or add and subtract a number of days while accounting for calendar dates.

  • Roman numeral converter

    Convert standard integers from 1 to 3999 to Roman numerals and back.

For exact work, confirm the unit convention and rounding required by the document, product specification, or software system you are using.

Frequently Asked Questions