Online calculators are used to perform either simple or complex mathematical operations. These can be accessed online without having to download. They quite often use either JavaScript or Java code.

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Martindale's Calculators

A collection of calculators for the sciences, business and everyday measurements. Organized by subject area.

AbaCal

An easy to use online platform for applied mathematics which includes an online calculator, a formula library and an exchange platform.

Alcula Scientific Calculator

An advanced online scientific calculator for students of mathematics.

AquaCalc

Convert between various units of measurement, calculate volume and area, convert weight to volume and volume to weight, gravel and mortgage calculators.

Area of a Circle

A simple calculator to calculate the radius, diameter, circumference, or area of a circle from a given parameter.

Binary Calculator

An arbitrary-precision binary calculator, which adds, subtracts, multiplies, or divides integer and fractional values.

Binary Hex Converters

Online tool for converting binary, decimal, hexadecimal and ASCII text.

Bit Calculator

Makes conversions between bits, bytes and its multipliers.

Calc

Online numeral system converter. Supports decimal, hexadecimal, octal, binary numbers, ASCII characters.

Calc Result

Provides a set of online calculators for math and physics.

CalcBuddy

A math resource website providing an online scientific calculator, and numerous special purpose calculators and unit converters

CalcMachine

Easy to use online calculator and expression evaluator. It supports basic arithmetic, trigonometry and logarithmic functions.

CalcNexus

Provides online calculators for web-enabled mobile phones and PDAs, including financial, fitness and conversion calculators.

Calculate Eigenvalues and Eigenvectors

Calculator for eigenvalues and eigenvectors. Includes a test example and various options.

Calculate for Free

Performs basic math operations, as well as square root and percentages. Includes memory save and recall.

Calculator

Online calculators for a variety of conversions and calculations.

A Calculator

A basic online calculator similar to many electronic calculators.

Calculator Pi

Provides functions common in science and engineering. Creates a printable sequence of calculations that can be bookmarked or shared as URL.

Calculator Soup

Free online calculators for finance, math, algebra, fractions, geometry, physics, time and statistics. Converters for common conversions.

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. [Modern GUI, Adobe-Flash based]

Calculator.pro

Calculators for basic, scientific, BMI, currency, credit, dec-hex-oct-bin, pregnancy, and ovulation. Simple GUI, JavaScript based.

Calculatoria

Online mathematical calculator with basic and scientific modes. Shows calculation history.

Calculla

The set of tools and tables used for calculating different math (and non-math) problems.

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.

Dario Alpern's Complex Number Calculator

Computes basic operations, 1/z, pi, exponent, log, trig, and polygamma functions. Includes memory feature.

Days Calculator

Helps to compute how many days have passed from an earlier time to the present day.

Desmos

Online graphing calculator. Free to use, supports hundreds of simultaneous equations, and supports interactive exploration via sliders.

eCalc

A free online scientific calculator, and conversion of length units.

Equalsto

Offers an online calculator and a multi function unit converter.

Fraction Simplifier

Online tools for fast simplifying fractions and mixed numbers.

Free Online Calculator

Free online calculator use for decision making, discovery and learning.

Free Online Spreadsheet Calculator

Free online spreadsheet calculator has an estimating and budgeting form that shows all your calculations and allows you to print and save results.

Fuel Cost Calculator

Calculates fuel cost based on inputted parameters.

GCalc

Free online graphing calculator for education use with 2d, 3d, cartesian, polar, calculus, differential equations, scientific, implicit function components.

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.

iFigure

Guide to online calculators, including those designed for home, travel, finance, health, and small business.

JavaScript Calculator Online

An easy to use online calculator based on the JavaScript function eval().

Math Calculators Online

Math online calculators and solvers for problems including polynomial equations, rational expressions, systems of equations, matrices, complex numbers, and analytic geometry.

meta-calculator

Free calculator graphs up to 5 equations, finds intersections and lets you save picture of graph to your computer.

The Number Empire

A collection of online calculators, including prime number finder, fraction solver, and solution finder for calculus equations.

Online Matrix Calculator

Calculates matrix determinant and inverse. Performs LU, Cholesky, QR, SVD decompositions. Calculates eigenvalues and eigenvectors.

Percent Change Calculator

Measures the difference in value using percentages. Includes bar graphs with the answer.

Quadratic Equation Calculator

Calculator for solving a general quadratic equation.

Scientific Calculator

Java applet online calculator.

Scientific Calculator

Javascript calculator with basic scientific functions.

Shannon entropy calculator

Shannon entropy allows to estimate the average minimum number of bits needed to encode a string of symbols based on the alphabet size and the frequency of the symbols.

Solve My Math

Collection of online math calculators for algebra, calculus, statistics.

Square Root Calculator

Interactive square root calculator that can handle negative, imaginary, and complex numbers.

Tip Calculator

Mobile friendly tip calculator which shows exactly what to put on your receipt.

Web 2.0 Scientific Calculator

Free online scientific notation calculator. Functions include math expressions, plots, unit converter, equation solver, complex numbers and calculation history.

WebMATH

Collection of simple calculators for general math, algebra, plots and geometry, trig. and calculus.

Wolfram Mathematica: Online Integrator

Free integration solver that also does derivatives, equations and plots.

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