Can someone explain how personal "Networth" is calculated

Just saw a retard on X/Twitter saying how 1000 cr wedding for the Ambanis is justified because the spending is 0.01 percent and of their Networth 😢🤕

Have a feeling that in future people are gonna throw this "Networth" around frequently while taking serious life decisions

Want to know how approximate can it be for a Salaried individual