<p>This study explores the synthesis and characterization of perovskite-type Nd_1−<i>x</i>Ca_<i>x</i>MnO₃ nanocomposites for use as high-performance supercapacitor electrodes. Using a facile co-precipitation method, we prepared nanocomposites with varying calcium doping levels (<i>x</i> = 0, 0.3, 0.5, 1). The materials were thoroughly characterized using x-ray diffraction (XRD), confirming the effect of the Ca dopant on the crystal structure, lattice parameters, and unit cell volumes of NdMnO₃ and verifying that nanocomposites were achieved for all materials. Also, NdMnO₃ micrographs exhibited a distinctive porous framework composed of interconnected particles, where Nd_0.5Ca_0.5MnO₃ displayed subtly altered morphological characteristics. Energy-dispersive x-ray spectroscopy (EDX) showed no signs of any trace elements. Brunauer–Emmett–Teller (BET) results for the Nd_1−<i>x</i>Ca_<i>x</i>MnO₃ nanocomposites revealed mesoscale pores with a remarkable increase in the specific surface area, leading to a reduction in the diffusivity of the ion path in addition to the buffer charge/discharge volume, which facilitated the electrochemical reactions of supercapacitors. The electrochemical performance was investigated through cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge measurements. The CaMnO₃ electrode exhibited the highest specific capacitance of 163.59&#xa0;F&#xa0;g⁻¹ at a scan rate of 5&#xa0;mV&#xa0;s⁻¹, with excellent cycling stability, retaining 98.5% capacitance after 1000 cycles. This work demonstrates the potential of calcium-doped neodymium manganite perovskites as promising electrode materials for next-generation supercapacitors.</p> Graphical Abstract <p></p>