Meta-Calculator is a free online calculator that should serve the needs of almost any high school student/college student for problem solving and math investigations tasks. It would also be useful for anyone who needs to analyze statistical data, do lots of calculations , graph equations or create images of equations—you can just hop on the internet browse to the webpage and download the graph!

Meta-Calculator is a multi purpose calculator that works both in your browser via the Flash Plugin and on your iphone/ ipad as an app–so pretty much every modern computer/phone out there can use it. It is really four calculators in one—a scientific one, graphing calc, statistics calculator and a matrices/vector calculator. Let’s look at each one in detail.

###### The Graphing Calculator

Meta Calc can graph up to 7 equations or inequalities, find their intersections, produce a table a values or trace a point along any equation. You can also zoom in/zoom out , set the x-scale or y-scale, x-min/max, y-min/max, pan around the graph with your mouse. A distinctive feature is the ability to save any of your graphs as images to your computer ( .png files). Just hit the ‘save graph’ button, and you will download the graph. This is a feature that any student or teacher could appreciate—the next time you need a graph for a presentation or a worksheet for your math lesson, just type in the equation and hit ‘save graph.’ I actually know some teachers that have used this very feature to introduce slope. One teacher, for instance, graphed 7 equations, slightly changing the slope for each one, and then let her students explore the relationship between the slope of a line and its graph.

###### The Scientific Calculator

The scientific calculator provides a really intuitive user experience. It has all of the basic functions and buttons you’d expect including sin, cos, sin^{-1}, cosh, log and more. Plus it has some more advanced features including a button to calculate least common multiples, permutations, combinations and—possibly most powerful of all—a linear equations solver that lets you input up to 6 equations with either two or three variables and the solver will calculate the solutions.

###### The Matrix Calculator

The matrices/vector calculator has a wide range of functions. You can calculate a matrix’s determinant, or its inverse. Also, you can add, subtract, multiply and transpose matrices. The same functions are available for vectors.

###### The Statistics Calculator

Last but definitely not least is the statistics calculator. This has the fundamentals that you’d expect: calculating quartiles, mean, median, mode as well as correlation coefficient and various types of regressions (linear, quadratic, exponential, cubic , Power, Logarithmic, Natural Logarithmic). You can then plot the data to the graphing calculator! A stand-out features is the ability to compute Student t-tests: either 1 or 2-Tailed T-Tests (paired and unpaired). I was unable to find any calculators online that let you enter raw data and calculate T-tests so this is quite a rare online find.

The calculator can be found here : http://www.meta-calculator.com/online/.