Best Online Calculators

Online Units of Measurement Calculators

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This category lists online calculators, designed to quickly and easily enable users to convert units, calculate interest and all kinds of other calculations. Whether you are a professional needing a quick calculation or a student looking for help, there is an online calculator here which can help.
  • Aqua-Calc

    Site for conversions and calculations. Converts various measurements including volume, weight, area, density, and financial figures. Presents conversion tables.

  • CalcNexus

    Free online calculators for mobile phones and PDAs including fitness and financial calculators.

  • Calculate Something

    Collection of online calculators ranging from VAT to percentages and journey cost.

  • Calculate What?

    Features a variety of online calculators enabling users to solve countless problems for free.

  • The Calculator Site

    Provides financial calculators, imperial to metric converters, and other calculation tools for general use.


    Online calculator directory offering calculations and conversions for all units of measurement.


    Online measurement conversion tools. Converts units from or to British Imperial and US derivatives.

  • Digital Dutch Unit Converter

    Simply convert units of length, distance, density, bits, bytes, force, mass, power, pressure, speed, temperature, and volume.

  • Easy Calculation

    Holds free online calculation and conversions.

  • Formula

    Free online conversion calculators for metric units, currency, and GPA. Includes algebraic steps and user favorites.


    Offers calculators, tables, and formulas for temperature, length, area, volume, and weight metric conversions.

  • NIST Conversion Factors for Energy Equivalents

    Online converter for units of energy.


    Offers thousands of conversions for almost every unit of measurement. Also offers a free conversion software for Windows users.

  • World Wide Metric

    Web-based conversion calculator for length, weight, volume, and pressure measurements.

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