During the current COVID-19 epidemic, IoT-based health monitoring devices could be incredibly useful for COVID-19 sufferers. This study develops an IoT-based system for real-time health monitoring that incorporates the patient's measured body temperature, pulse rate, and oxygen saturation, which are the most important critical care indicators. A liquid crystal display (LCD) shows the current temperature, heart rate, and oxygen saturation level, which can be easily linked with a mobile application for quick access. Using an Arduino Uno-based device, the recommended IoT-based technique was tested and verified on five human test subjects. The system's results were promising: the data collected by the system was saved fast. The system's results were found to be accurate when compared to other commercially available devices. IoT-based gadgets could be immensely valuable in saving people's lives during the COVID-19 epidemic.