Scientific Calculator

There are a variety of different calculators available here

Instacalc Online Calculator

Just type and the answer appears

GCalc

Online graphing calculator. GCalc is designed to provide a basic, easy-to-use, well-balanced set of graphing functionality for algebra, pre-calculus, calculus and beyond.

Web2.0 Calc

Web2.0calc is an free, web2.0 styled cool online calculator that can perform complex arithmetic calculations and plot graphs right from inside your browser.
cool online calculators
cool online calculators

For example, to calculate cube root of 64, enter 64 in the input box, click 3√x button and hit enter. The answer would neatly show up above the calculator frame.

Other cool online calculators: Encalc, eCalc and InstaCalc.




Calculator City from 1728 Software Systems has online converters and calculators for topics studied in basic math, algebra, geometry, trig, calculus, and more. Several include additional graphics and brief discussions of concepts associated with the calculator.
Calculators On-Line Center features over 19,000 calculators for mathematics, statistics, science, and engineering. Calculators for mathematics range from those suitable for basic mathematics through calculus and higher level mathematics. Don't miss this vast collection of specialized calculators by topic from J. Martindale.
Coolmath Online Graphing Calculator is free and has all the common operators and functions expected in scientific calculators and graphing calculators for graphing functions. Great alternative for students who forget their own handheld graphing calculator, such as the TI-83.
Cyberchase Talking Calculator is a free basic online calculator (add, subtract, multiply, divide) from PBS Kids.
eCalc "is a free online calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math. The calculator is designed to work directly in your browser and requires no special plug-ins." There is a basic calculator and a scientific calculator, the latter of which includes trig, log, and exponential functions, and decimals to fractions. Both have large keys for easy input. A demo video is online. eCalc is not a graphing calculator. However, it's definitely worth investigation.
e-Tutor online graphing calculator is free (current is a beta version) and can be used to graph simple to advanced equations. Multiple equations can be shown on a single graph.
GCalc is a free online graphing calculator. "GCalc is designed to provide a basic, easy-to-use, well-balanced set of graphing functionality for algebra, pre-calculus, calculus and beyond."
GraphCalc is a Windows 2D/3D graphing calculator. Download it for free. The developers call it "an all-in-one solution to everything from everyday arithmetic to statistical analysis, from betas to Booleans, from cubes to calculus, from decimals to derivatives. GraphCalc combines all the features of a professional mathematics package with the simplicity of an easy to learn windows interface. It provides user-friendly help and tutorials to guide you through the easy and fun process of mastering GraphCalc." A Linux version is also available.
Graphing Calculator Help from Prentice Hall for TI-82, TI-83, TI-85, TI-86, TI-89, TI-92, HP48G, CFX-9850, Sharp EL9600C, and Casio FX2.
SimCalc MathWorlds software for TI-graphing calculators, computer, and TI-Navigator developed by the University of Massachusetts-Dartmouth's James J. Kaput Center for Research and Innovation in Mathematics Education. Animations, real life examples, narrative stories, and more are used to explain math concepts.
Talking Calculator from Premier Assistive Technology is an onscreen full-function talking calculator that can be used with or without a screen reader. "Every button and edit area talks. It is easy to use with large keys and contrasting colors. It has three display areas, so when the user adds a series of numbers, the total is always displayed, even as you are entering a new number, while always displaying any numbers in memory." Further, "it displays your entries and results as you work. It actually displays the equation so that you can easily see or hear your last process. When students are required to show their work, they can simply cut and paste the steps into a document." A free download is available.
TI Math has activities for use with Texas Instrument graphing calculators (TI-Nspire, TI-Nspire CAS, TI-84 Plus Silver Edition and TI-89 Titanium) in various subjects, which include algebra 1, algebra II, geometry, precalculus, calculus, and statistics.
Tutorials from Texas Instruments. TI provides a number of interactive tutorials for basic and graphing calculators.
Tutorials from Atomic Learning on Texas Instruments calculators: the TI-30XS, TI-84 and TI-Nspire handhelds.