Estimates suggest that black holes constitute less than 1% of the observable universe's total mass, with the majority being normal matter. The total mass of the universe cannot be definitively measured due to its vastness, but relative contributions can be discussed based on observable data. Stellar black holes are challenging to quantify, while supermassive black holes can be estimated through their gravitational effects on surrounding matter. Additionally, all black holes are theorized to emit Hawking radiation, with smaller black holes producing a higher flux, leading to their eventual evaporation. However, the existence of Hawking radiation has yet to be directly observed, and other processes may account for some high-energy phenomena.