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The title compound, C 18 H 17 NO 2 , was prepared from 1-hydr­oxy-8-methyl­carbazole and 3,3-dimethyl­acrylic acid with trifluoro­acetic acid as the cyclization catalyst. Due to the –CMe 2 – group, the mol­ecule is not quite planar. The packing is dominated by the strong N—H⋯O hydrogen bonds and some weaker C—H⋯O and C—H⋯π inter­actions. π–π Stacking inter­actions [centroid–centroid separation = 3.806 (2) Å] join neighboring mol­ecules into loosely connected inversion dimers.

2,2,10-Trimethyl-2,3-dihydropyrano[2,3-a]carbazol-4(11H)-one