How to Measure Integration Curves in the NMR Spectrum
You can use integration curves on the nuclear magnetic resonance (NMR) spectrum to show peak intensities. The peak intensity — or the area underneath a peak on the NMR spectrum — is related to the number of hydrogens that the peak represents.
Traditionally, integration is shown on the spectrum by the addition of an integration curve (as shown in the figure), although modern computing has made digital integration common that doesn’t require you to do any measuring. The height of this integration curve is proportional to the area underneath a peak, so this height is proportional to the number of hydrogens the peak represents. (The width of the curve is unimportant.)