Romania for example has a flat rate income tax for everyone regardless of income so you can just negotiate your NET salary directly.
The most commonly used salary calculator [0] does a good job of taking all of that into account, so you can clearly see all three actual figures.
For some reason this isn’t common practice. I’ve always found it weird that salaries are quoted in gross amount.
In some cases the round number may not be the “net” amount because eg maybe you have some rental income, or income from last year, moved to a new state, etc. But in most cases it’ll be pretty close.