If you max out 401k and IRA this is $275k, which is $168K take home or $14k a month.
1-bedroom in SF + Utilities: $4000
Car: $500
Parking: $200
Groceries: $500
Healthcare (copays/premium contribution): $200
Entertainment (incl drinks, streaming services, going out to eat): $500
Phone: $100
Misc. transit: $200
Debt payments (Student loans): $400
Left over: $7400
If you want a child or buy a home...
A 2-bedroom condo will take $1.5M or $300K for a down payment. Then you have to add insurance + HOA. A 1.2M mortgage + insurance + HOA will be close to $8K/month.
Full-time childcare costs $2K/month (+ need to save for college, then all the costs with raising a child).