Lumopra is a specialized calculator that simplifies the complex physics of laser amplification into an easy-to-use tool, allowing users to quickly estimate small-signal gain and output power for both solid-state and fiber laser systems. By combining essential parameters like input power, pump power, gain medium length, and emission cross-section—with an optional advanced setting for population inversion density it delivers reliable insights into amplifier performance. Designed with a colorful, modern interface, Lumopra helps researchers, engineers, and optical professionals analyze laser behavior efficiently, making it both practical for quick checks and powerful enough for detailed study.