Proton Fourier transform nuclear magnetic resonance spectral data were collected on n-alcohol ethoxylates and used to calculate the percent ethylene oxide (EO) content of the n-alcohol ethoxylate without an internal or external standard. The accuracy and precision of the method were determined from ten repetitive analyses of hexaethylene glycol mono n-dodecyl ether. The standard deviation was 0.23 wt% EO with a relative standard deviation of 0.40%. The method had a relative error of +0.55% and an absolute error of +0.32% EO.KEY WORDS: Ethylene oxide, n-alcohol ethoxylatc analysis, NMR.