- Martindale's Calculators
- A collection of calculators for the sciences, business and everyday measurements. Organized by subject area. - Calculate for Free - Performs basic math operations, as well as square root and percentages. Includes memory save and recall.
- ABE Volume Calculator Page - A collection of volumetric calculators for a variety of shapes. Including cylinder sphere barrel pyramid and dome.
- Percent Change Calculator - Measures the difference in value using percentages. Includes bar graphs with the answer.
- Convertalot - Collection of free Java measurements converters, calculators, and unit translators.
- The Number Empire - A collection of online calculators, including prime number finder, fraction solver, and solution finder for calculus equations.
- Dario Alpern's Complex Number Calculator - Computes basic operations, 1/z, pi, exponent, log, trig, and polygamma functions. Includes memory feature.
- Calculator - Online calculators for a variety of conversions and calculations.
- Calculatoredge - Provides several online calculator tools for solving complex equations and formulas in the fields of mechanical, electrical and chemical engineering, physics, math, electronics, metallurgy and finance.
- Calculator City - Includes tools to solve equations like for velocity, density, financial, geometry, algebra, calculus, astronomy, chemistry, physics and webpage color coders. Also, has trivia fact pages, such as state demographics and presidents.
- DigitConvert - Convert to and from any number base with radix points. Also add, subtract, multiply, and divide numbers of any base and output to any base.
- Country Distance Calculator - Calculates distance between any two cities for selected country and locates them on the Map. Driving directions are also available for some of the countries.
- Calc Result - Provides a set of online calculators for math and physics.
- Avasmath 80 - Online programable scientific calculator with scientific functions and replayable calculations.
- Encalc - Free online scientific calculator supporting formulas and unit calculations.
- Days Calculator - Helps to compute how many days have passed from an earlier time to the present day.
- Quadratic Equation Calculator - Calculator for solving a general quadratic equation.
- Math Fest - A list of online basic, scientific, graphing, CAS and business calculators with thumbnails and a short description.
- Hiox Calculator & Converter - Features calculators for arithmetic functions, scientific computations, binary conversions, areas, financial interest, prime numbers, recurring fractions, factoring, matrices, HEX color converter, date and day calculations, as well as for measuring bandwidth.
- Calc - This tool allows you to convert the same number between its representations under different number systems, such as decimal, hexadecimal, octal and binary numeric systems.
- ScatterMall.com - Free calculators for science, travel, students, health, education, weather, math, and business. Includes graphing calculators and measurement conversions.
- Coggit - Provides online calculation and conversion tools for math, currency and tax.
- CalcNexus - Provides online calculators for web-enabled mobile phones and PDAs, including financial, fitness and conversion calculators.
- Online Matrix Calculator - Calculates matrix determinant and inverse. Performs LU, Cholesky, QR, SVD decompositions. Calculates eigenvalues and eigenvectors.
- eCalc - Free online calculator that supports both a basic and advanced scientific mode. It includes support for the following features: complex numbers, unit conversion, base conversion, decimal to fraction, RPN and algebraic modes and equation solver.
- Stack Scientific Calculator RPN - Javascript scientific calculator using RPN.
- Calculate Now - A collection of online calculators for science, business and everyday living
- Coount.com - Free online step-by-step java scientific calculator.
- Calculator for Eigenvalues and Eigenvectors - Includes a test example and various options.
- Web 2.0 Scientific Calculator - Free online scientific notation calculator. Functions include math expressions, plots, unit converter, equation solver, complex numbers and calculation history.
- Lovely Calculators - Provides a range of calculators for banking and finance, astrology, health and fitness and temperature conversion.
- Calc.Matthen.com - Online integrator, differentiator, graph plotter and formula manipulator.
- Binary Hex Converters - Online tool for converting binary, decimal, hexadecimal and ASCII text.
- Online Calculator - A collection of online calculators
- Equalsto - Offers an online calculator and a multi function unit converter.
- Pocket Calculator - Online calculator, written in Java. Includes square root button and number memory. Source code can be downloaded.
- Online Scientific Calculator - Free scientific calculator for mathematics, physics and engineering. It includes support for fraction, base conversion, matrix, equation solver and advanced functions.
- Scientific Calculator - Java applet online calculator.
- Decimal/Binary Converter - An arbitrary-precision, decimal to binary and binary to decimal converter, which converts both integer and fractional values.
- Sicyon - Online graphing calculator.
- Calculator Tab - Free scientific online calculator, which includes long-term memory, trigonometric functions, logarithmic functions, brackets and the modulo operation. It can be opened in a small pop-up window and includes a user guide.
- EngNet Engineering Units Converter - Online calculator provides conversions between a number of common (and not so common) units.
- Mathator Calculator - Online application designed for performing mathematical and scientific calculations. It can also plot graphs and handle matrices and functions from it owns library.
- Tampile Temperature Conversion - Converts a temperature from Celsius, Fahrenheit, Kelvin or Rankine.
- Scientific Calculator - 16 function online calculator, written in JavaScript.
- Cleave Books - Specialist Calculators - Features converters for perimeter measurements of geometric figures, fractions, percentages, number bases, loan repayments, growth and decay, cost of living index, fuel consumption, flow rate, specific energy, viscocity, and heat capacity.
- PractiCalc - Calculator and conversion tool for all Windows platforms. It provides the result of calculations as they are typed in.
- iFigure - Guide to online calculators, including those designed for home, travel, finance, health, and small business.
- Scientific Calculator - Javascript calculator with basic scientific functions.
- AbaCal Beta - Free online math calculator with formula library. Provides a getting started document to help run abaCal and use its full potential.
- CalcMachine - Easy to use online calculator and expression evaluator. It supports basic arithmetic, trigonometry and logarithmic functions.
- Bit Calculator - Online calculator that makes conversions between bits, bytes, kilobits, kilobytes, megabits, megabytes, gigabits, gigabytes, terabits, terabytes, petabits, petabytes, exabits, exabytes, zettabits, zettabytes, yottabits, yottabytes.
- Calculator Soup - Free online calculators for finance, math, algebra, fractions, geometry, physics, time and statistics. Converters for common conversions.
- GCalc -- Java Mathematical Graphing System - Free online graphing calculator for education use with 2d, 3d, cartesian, polar, calculus, differential equations, scientific, implicit function components.
- Wolfram Mathematica: Online Integrator - Free integration solver that also does derivatives, equations and plots.
- Matrix Calculator - Online Java calculator for matrix operations.
- AJAX Calculator - Offers evaluation of math expressions that have been input by the user.
- Monachos Calculators - Online calculators with variety of engineering functions, including unit conversion, periodic table, piping applications, and electrical applications.
- Function Grapher - Graph functions in 2D, 3D and polar coordinate system. Up to 3 functions in a single graph.