What is the Definite Integral Calculator?
Type a function of x like x^2, sin(x) or e^(-x^2), set the lower and upper limits, and the tool gives the definite integral – the signed area under the curve. It uses Simpson’s rule with thousands of slices, so answers are accurate to many decimal places, and it draws the curve with the area shaded.
How to use the Definite Integral Calculator
- Enter f(x) using x as the variable (use ^ for powers, pi and e are allowed).
- Enter the lower limit a and upper limit b.
- Read the integral, the average value and see the shaded graph.
What does a negative answer mean?
Area below the x-axis counts as negative. The tool also shows the total (absolute) area.
Can it do indefinite integrals?
No, it gives a number for fixed limits. For symbolic integrals use a CAS.
This Definite Integral Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech