Riemann Sum Calculator

A Riemann sum is a finite approximation of a definite integral. It partitions the interval [a, b] into n subintervals and approximates the area under the curve using n rectangles

The calculator uses the standard published formula for riemann sum is a finite approximation of a definite integral. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Divide [a, b] into n equal subintervals of width Δx = (b−a)/n. Each step in the calculation is shown so you can verify the result manually.