Calcium is widely used in industrial applications, particularly in the production of alloys. It is added to aluminum, copper, and lead alloys to improve their mechanical properties and resistance to corrosion. In steel manufacturing, calcium is used as a deoxidizing and desulfurizing agent, helping to remove impurities and enhance the quality and durability of the metal.

It also plays a role in the production of cement and concrete, where it contributes to the setting and hardening processes. Calcium compounds are utilized in water treatment to adjust pH and soften water by removing mineral impurities.

In the chemical industry, calcium serves as a reducing agent in the extraction of other metals such as uranium and thorium. It is also used as a drying agent for certain solvents due to its strong affinity for moisture.

In biological and pharmaceutical contexts, calcium is essential for bone and teeth formation, muscle function, and nerve signaling. It is commonly included in dietary supplements and fortified foods to support human health. Additionally, calcium salts are used as excipients in tablet formulations to improve stability and structure.