The Best Free Calculators

  • fxSolver

    Free Web Website

    Online math solver, equation editor and database, graphing calculator and science/engineering problem helper.


    fxSolver icon
  • Soulver

    Commercial Mac Website

    Soulver helps you do quick calculations and work things out. Use Soulver to play around with numbers, do "back of the envelope" calculations, and solve day-to-day problems.


    Soulver icon
  • SpeedCrunch

    Free Mac Windows Linux Website

    SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including:
    Unlimited Variables,
    Syntax Highlighting,
    Functions, with 'Automagic' Completion,
    50 Decimal Precision,
    Input History
    and more...


    SpeedCrunch icon
  • Omni Calculator

    Free Web Android iPhone iPad Website

    Omni Calculator is a web/mobile calculator that solves concrete problems such as mortgage payment, gross margin, body mass index, break-even point, etc. It's very user-friendly, flexible and usable on web, mobile and as an embeddable web widget.


    Omni Calculator icon
  • CalcTape

    Freemium Windows Website

    CalcTape is a revolutionary new kind of pocket calculator. With CalcTape, also extensive calculations remain clearly structured. CalcTape makes the arithmetic process visible - you can generate intermediate results and subsequently correct or change all numbers and operations.

    CalcTape for Windows - details:

    • Enter many calculation terms in one turn and still keep an overview - like on an adding machine.
    • Change any term afterwards and CalcTape will refresh the whole calculation automatically.
    • Use intermediate results to check and structure your calculation.
    • Comment your calculation terms, to give sense and context to it.
    • Save your calculations into files. Open the files later and you can change the calculations. CalcTape will refresh the whole calculation automatically again and again.
    • Use your existing CalcTape files as templates. Do similar calculations and play different scenarios.
    • Use the programmable buttons e.g. for fast TAX calculations.
    • CalcTape masters the four basic arithmetical operations, exponentials, and percentage calculations.
    • CalcTape for Windows requires Windows XP, Windows Vista (x86 and x64) or Windows 7 (x86 and x64).

    Extended functionality of the Pro and Enterprise version:

    • Scratchpad for every-day calculations is being saved automatically.
    • Put calculations side by side for comparison.
    • Work with variables and generate "speaking" calculations.
    • Define as many programmable keys as you like.
    • Use parentheses and trigonometry when defining variables.
    • And much more ...


    CalcTape icon
  • OpalCalc

    Freemium Windows Website

    OpalCalc is a brand new type of calculator for the PC. As easy to use as Notepad or a word processor, OpalCalc allows natural language in the sum and multi-line support so you can go back and adjust your previous calculations on the fly.

    For years, PC calculators have been trying to copy handheld calculators in both functionality and appearance. OpalCalc sets out to disregard previous conceptions, and instead we considered how a calculator should behave with a full keyboard in mind. The result is simplicity itself, but with almost spreadsheet-like capability.

    OpalCalc features include percentages, currency conversion, custom functions/variables, excellent documentation, colour coding, lightweight size, configurable GUI, hundreds of measures and functions, and lots more. The full version can be obtained with a donation of any amount (even a few pence). There is no time limit in the 'lite version', just a 5 line limit which is very useful for most purposes.


    OpalCalc icon
  • Microsoft Mathematics

    Free Windows Website

    Microsoft Mathematics is a desktop graphing calculator that can help you visualize and see mathematical concepts as you’ve never seen them before. Microsoft Mathematics includes ink handwriting support to recognize hand-written problems.


    Microsoft Mathematics icon
  • Qalculate!

    Free Windows Linux Xfce Website

    Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation). Features include a large library of customizable functions, unit calculations and conversion, symbolic calculations (including integrals and equations), arbitrary precision, interval arithmetic, plotting, and a user-friendly interface (GTK+ and CLI).


    Qalculate! icon
  • Calculator

    Free Web Android Chrome OS Android Tablet Android Wear Website

    Calculator provides simple and advanced mathematical functions in a beautifully designed app.


    Calculator icon

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