Integral Calculator

Free integral calculator to calculate double integral. Instant results in your browser — no signup.

JavaScript is required for live calculation.

You can still read how Integral Calculator works, the formula, examples, and FAQs below.

x coefficient
y coefficient
Constant term
x from
x to
y from
y to

Solver

Solve for the unknown — formula stays visible.

Problem

Enter the equation or unknowns.

x coefficient

y coefficient

Constant term

x from

x to

y from

y to

Results update when you click Integrate.

Solution

Answer first, then validation and steps.

∬ f dA

1.000000

Exact: 1.000000

f(x,y) = 1.0000x + 1.0000y + 0.0000

Domain

Variable	Range
x	0.0000 to 1.0000
y	0.0000 to 1.0000

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What this result means

Free integral calculator to calculate double integral. Instant results in your browser — no signup. Midpoint Riemann sum over rectangle; exact shown for affine f.

Assumptions

Rule dependency: Universal formula.

Method

Midpoint Riemann sum over rectangle; exact shown for affine f.

Example

∬(x + y) dA on [0,1]×[0,1] = 1.

Frequently asked questions

Non-rectangular?+

This MVP uses rectangular domains only.