After-tax income per month
Rent, mortgage, property tax
Dining out included
Car payment, gas, transit
Electric, water, internet, phone
Health, auto, life insurance
Credit cards, student loans
401k, emergency fund, brokerage
Entertainment, subscriptions, personal
CategoryAmount% of Income50/30/20 Rule

Developers: this data is available as a free JSON API → API docs

Free calculator by Kultranz
Developers: the data behind this widget is a free JSON API → API docs