Expression
The integrand. Multiplication can be implicit: 3x, 2sin(x), 2(x+1). Do not write 2e-3 as 2e if you meant 2×e; scientific notation keeps the digits.
Variable, From, To
Default variable x. Blank bounds → indefinite. Both filled → definite (and a shaded plot).
Reading the plot
The curve is f, not F. Shading marks the definite interval when bounds are numbers.
FAQ
d/dx instead?
Type a problem on the calculator — it runs in this browser and nothing is uploaded.
Open the calculator — Integral Calculator