An extensive overview of nano calcium is given in this article, with particular attention paid to its synthesis methods, characterization techniques and agricultural applications. It highlights the unique properties of nano calcium and its potential as a promising nanomaterial in agriculture. The synthesis section discusses various methods to produce nano calcium, including sol-gel, precipitation, hydrothermal synthesis and green synthesis approaches and it highlights the nuances involved in tailoring nano calcium particles for agricultural purposes. The article also emphasizes the significance of characterization techniques in understanding the physicochemical attributes of nano calcium by using tools such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). It explores the agricultural applications of nano calcium, particularly its role in enhancing nutrient uptake, soil fertility and crop yield. The impact of nano calcium on plant growth, stress tolerance and disease resistance is discussed, offering a comprehensive perspective on its potential benefits for sustainable agriculture. The article also highlights how nano calcium can be an eco-friendly alternative by reducing dependence on traditional fertilizers and minimizing environmental harm. In conclusion, it combines existing research on nano calcium synthesis, emphasizing its potential to transform modern agriculture and support global food security.