Calculate how many words and characters in the text

The calculator calculates the weighted average of the ratings of the following items.              

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.

Calculator converts numbers to roman Arabic or Roman to Arabic vice versa. The maximum value that the calculator correctly parse the number 3999.              

The calculator calculates the surface area of ​​the parabola with the given base width and length of the perpendicular [see calculator squareness]. The result is given as the user input unit square.