Sitthiwirattham, ThaninAli, Muhammad AamirBudak, HuseyinPromsakon, Chanon2025-10-112025-10-1120250035-75961945-3795https://doi.org/10.1216/rmj.2025.55.255https://hdl.handle.net/20.500.12684/21712We establish error bounds for the open Newton-Cotes formula with n = 1 for differentiable convex functions in fractional calculus. We use for this purpose an integral identity, which we prove, having Riemann-Liouville fractional integral and ordinary derivative. We give applications for special means, and add an example to show the validity of inequalities with a graph for different values of fractional parameter alpha.en10.1216/rmj.2025.55.255info:eu-repo/semantics/closedAccessopen Newton-Cotes formulaconvex functionArticle5512552632-s2.0-105005882212WOS:001501956700018Q3Q2