basic

Trapezoidal Rule Definite Integral Calculator

∫ ≈ h/2·(f0+2f1+…+2fn-1+fn) — trapezoidal approximation.

Approximates a definite integral using the composite trapezoidal rule from up to five equally-spaced function values.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

∫ ≈ h × [f0/2 + f1 + f2 + f3 + f4/2]

In depth

Approximates a definite integral using the composite trapezoidal rule from up to five equally-spaced function values.