Everybody needs a calculator at some point. You can use your physical calculator whenever it is with you. But what about the "miss" when you are in a need. You better go for the internet and see some useful and handy "Online Calculator". But are all the tools useful. May be or may be not. But the tool I am talking about is always available when you need it. It's eCalc.
eCalc is a free and easy to use scientific calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math. eCalc is offered as both a free online calculator and as a downloadable calculator. Especially engineering students would love to use this online calculator which has better functions than the windows default calculator.
It has basic functions like:
Addition, Subtraction, Multiplication, Division, Sign, Square, Square Root, Raise to the Power, Natural Exponential, Logarithm, Natural Logarithm, Inverse, Exponent, Factorial, PI, etc.
It has Online Trigonometric Functions like:
Sine, Inverse Sine, Cosine, Inverse Cosine, Tangent, Inverse Tangent, Cosecant, Inverse Cosecant, Secant, Inverse Secant, Cotangent, Inverse Cotangent, etc.
It has Online Hyperbolic Trigonometric Functions like:
Hyperbolic Sine, Inverse Hyperbolic Sine, Hyperbolic Cosine, Inverse Hyperbolic Cosine, Hyperbolic Tangent, Inverse Hyperbolic Tangent, Hyperbolic Cosecant, Inverse Hyperbolic Cosecant, Hyperbolic Secant, Inverse Hyperbolic Secant, Hyperbolic Cotangent, Inverse Hyperbolic Cotangent, etc.
It also have some advanced features like support for complex numbers, unit conversion, base conversion, and has a built in equation solver.
Download link for eCalc Scientific Calculator (Windows Version) is Here
Download link for eCalc Scientific Calculator (Mac OSX Version) is Here