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Calcium copper titanate (CCTO) ceramic is prepared by conventional solid-state reaction (SSR) technique. Sintering of manufactured CCTO ceramic is completed at 1050 °C for 4 h. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) are used to know the crystallinity and microstructural properties of CCTO ceramic. The space group (Im3) of CCTO crystal structure is confirmed by XRD analysis. FE-SEM image discloses that the grains have distinguishable grain boundaries. Grains are highly compact and porosity is very low. The dielectric properties and electrical properties are investigated in the temperature and frequency range of (30–130 °C) and (100 Hz–1 MHz), respectively. At 100 Hz and 30 °C, CCTO exhibits a giant dielectric constant ~ 7685. Impedance analysis confirms the relaxation, depends on temperature in CCTO ceramic. Existence of relaxation named non-Debye in CCTO ceramic is confirmed by Modulus study. Activation energy calculated by linear fitting of dc-conductivity is 0.14 eV. This material is a suitable candidate for capacitor application due to giant dielectric constant. [ABSTRACT FROM AUTHOR]