I'm no mathematical genius but SpeQ is a rare example of a mathematical calculator that's easy enough for even dunces to calculate complex calculations.

SpeQ is an extremely small but powerful mathematical calculator with an intuitive interface, that makes it clear how to perform just about any calculation. It allows you to add, edit and execute calculations in a few seconds and supports all the common functions you require in a calculator.

Although SpeQ is aimed at those studying maths at an advanced level, anyone that's studying the subject will find something of use in it. If you want to take it with you to school or university, you can also run it directly from a USB stick which gets around those annoying download and install restrictions in most educational institutions. SpeQ is particularly useful for engineers or simply those looking for a slightly more powerful version of Windows calculator.

Quick, simple and packed with functions, if I'd had SpeQ at school, I'd probably have worked out the meaning of life.

Download SpeQ 3.3 in Softonic

If you're one of those mad scientists who don't have enough with the Windows calculator, then SpeedCrunch is for you.

This powerful advanced calculator lets you perform many mathematical tasks with an up to 50 decimal precision which I personally find impressive. Also, instead of a tiny rectangular screen like the one you find in real calculators, SpeedCrunch features a huge, blank space where all your operations are conveniently saved, so that you can review your calculations at any time.

SpeedCrunch supports on-the-fly calculations, includes more than 50 built-in math functions and can be easily customized. You can use it with its virtual keyboard or your own physical PC keyboard, though math functions can only be entered from the virtual one. It would have been a great idea to create shortcuts for those functions.

With SpeedCrunch you can easily perform many different maths calculations and functions with a high precision and the possibility to review results at any time.

Download SpeedCrunch 0.10.1 in Softonic

ProKalc is a full-featured scientific/financial calculator with scrolling tape. Using a point-and-click interface, you enter data for trig, exponential, scientific, and amortization problems and get immediate answers, with your input reviewable on tape. You can print results to the Clipboard, a file, or a printer. Ten editable memory locations, online context-sensitive help, and pop-up work screens for complex calculations. ProKalc features 15-digit accuracy in scientific mode along with multi-pane financial and geometry modules to ease calculations.

Download ProKalc 7.9b in Softonic

ESBCalc is a Win32 Scientific Calculator with Infix Notation, Brackets, Scientific Functions, Memory, Optional Paper Trail, Result History List, Customisation of the Colours & Fonts used, Customisation of the Hints, and more.

Functions include Trigonometric, Hyperbolic, Logarithmic - Base 10, Base 2 & Natural - and many more. Now includes Prefix Function support so that Log (1.3) can be entered as log 1.3 rather than as 1.3 log which is the default behaviour. Looks best with Windows XP in 800x600 (or better) and 32-bit colour. Now with improved Large Font Support.

Download ESBCalc Pro 6.2.3 in Softonic

AllerCalc, previously know as VersaCalc, is an advanced calculator which allows you to perform complex scientific calculations that other calculators can't handle.

The calculator works with a rotating screen that stores your last calculations and results. It supports more than forty functions including algebraic, transcendental, trigonometrical, hyperbolic and financial. Chances are that if you can't solve a mathematical equation with this calculator, then you won't be able to solve it with anything.

AllerCalc also includes different options that allow you to choose the sources, format (general or scientific) and select the number of decimals to visualize. You can even make metric conversions and much much more. A powerful calculator for that need some serious mathematical power.

Download AllerCalc 2.11 in Softonic

I must admit I'm a very math-challenged person. Numbers were my main weakness at school and even nowadays I have problems to check if my change is correct when I'm shopping. But this doesn't mean I can't appreciate a tool like Math Solver.

This amazing program helps you solve all kinds of mathematical problems, from a simple addition to a complicated geometrical function. Not only does it solve the operation, but also draws a graph based on it if possible, and gives extra information about the generated graph. The program also includes an excellent database with constants and functions.

On the downside, I think Math Solver is not really comfortable to use. Solving expressions and representing functions take too many clicks. Also, as each piece of information is offered in a separate window, your desktop can get really messy. Besides, Math Solver keeps a history of previously entered expressions so that you can review them or reuse them at any moment, but unfortunately they're not saved when you quit the program.

Download Math Solver II 1.1 in Softonic

Calctor is an advanced calculator with a simple interface. You have an input-region where you enter your calculations, and an output-region where the results of your calculations automatically appear while you're typing.

The complete solution to your scientific calculator needs.

Download Calctor 2.1 in Softonic

Algebrus is meant for everybody who needs to do either scientific analysis or just doing school homework. It provides user with numerous mathematical and analysis functions as well as allows unlimited extension of its functionality by means of user-defined types, constants, operators, routines, and libraries.

Its extensibility is based on a built-in simple to learn and yet powerful programming language XPascal. Algebrus can be used both as a simple "evaluate-while-typing" calculator and as a powerful mathematical analysis application, which includes 2D and 3D graphic plots of functions and data, command line execution console, and a syntax-highlighted XPascal editor as a part of the integrated development environment (IDE).

Calculations include:

• Vector and matrix operations and functions
• 2D and 3D graphic plots of function and data
• More than 50 built-in mathematical functions
• User-programmed procedures and functions
• User-defined types and operators
• Solving of linear algebraic systems
• Solving of ordinary differential equations
• Inversing matrices, Fourier analysis
• Statistical data analysis

Using special Plotter tool, creating 2D and 3D graphic plots of functions requires no programming skills whatsoever. Evaluator tool allows simple and interactive evaluation of functions and procedures. It fully supports interfaced constant declarations that appear in the Evaluator as Parameters section

Download Algebrus 3.2 in Softonic

Excalibur is a freeware full-featured RPN-only calculator with 300 functions (scientific, business, conversion, computer science, physics, complex numbers, geometry, vectors, etc), full 4 or 8-level stack, international support for different comma and decimal point formats, programmable, macros, registers, custom button banks, etc. It's difficult to find a freeware calculator so powerful!

Download Excalibur 2.0 in Softonic

Calc98 is a Scientific, engineering, statistical and financial pocket calculator simulator program for the Microsoft Windows operating systems. It includes a comprehensive set of conversions, constants and physical property data, a built-in periodic table of the elements, number base conversions, vectors, matrices and complex numbers. It is especially suitable for the scientific, engineering, medical and teaching professions and also in finance.

Download Calc98 5.6 in Softonic

The Mother of all Calculators, a Swiss Army knife for scientists and engineers. Perhaps the most capable scientific/engineering calculator for Windows. On one hand, this is a calculator: it evaluates expressions with more than 100 functions (trig/inverse, log/exp, statisical distributions, Euler, conditional, user-defined). Expressions are entered in the customary algebraic notation, and then simply calculated. After computing the value, an expression can be modified or corrected, and recomputed at will.

There ara also unit conversions, physical constants, computer math (binary, octal, hex), and function graphs included. For more advanced users, Kalkulator provides less trivial operations: numerical integration and differentiation, interpolaton (linear or cubic spline), statistics (mean, s.d., histograms, polynomial regression), column operations on stat data, polynomial roots, linear algebra (vector/matrix operations and systems of linear equations).

Hard-to-find features: systems of non-linear and differential (ODE) equations, multi-argument function extremum search and point or histogram fitting which includes an arbitrary function. Most importantly, advanced features don't obstruct the basic ones. You can use as much of Kalkulator's capabilities as you need, without being hampered by program capabilities you do not need. Disk save/restore, Help file and other niceties are also included.

Kalkulator has been evolving on various OS platforms for the last 15 years, being refined and polished through all this time, and its author has more than 25 years of active experience in numerical methods and software development.

Download Kalkulator 2.50 in Softonic

SkinCalc, which is completely free, features standard and advanced calculator functionality, a spreadsheet interface, and skins. Skins make it possible to change the layout and functionality of the software, with effects that include non-rectangular shapes, user-configurable transparency and alpha channel translucency. More than 100 skins are available from the sites listed at skincalc.com, which also has instructions to create your own skins.

Download SkinCalc 3.5.5.0 in Softonic

Instead of the traditional look of many buttons, Equalizer has a simple text line on which you can write the expression in the same way you'd write it on paper (for example: typing "(6*5-12) / 2" will show the answer "9"). Equalizer can also draw graphs of equations. In addition, Equalizer is fully skinable - you can completely change its appearance, and even create your own skins.

Download Equalizer 1.77 in Softonic

Fast screenplots and an environment for designing printable plots, which may as well be exported to GIF and BMP files. Wide support for both simple and parametric plots, composition of several curves into one picture, drawing of directional or vector fields. Comes with standard libraries covering areas of science and mathematics. Some 200 standard functions, see author's homepage for a systematic reference of these.

Download RF21 Calculator 0.91 in Softonic