Integral Approximation Calculator

Use this tool to find the approximate area from a curve to the x axis.
Read Integral Approximations to learn more.

 

Note: use your eyes and common sense when using this! Some curves don't work well, for example tan(x), 1/x near 0, and functions with sharp changes give bad results.

Plus and Minus

definite integral cos(x) from 1 to 3

Note also that when the curve is below the axis the area is negative.