A monthly budget starts with one simple comparison: income in versus expenses out. This calculator gives you that baseline number and your savings rate, the single most-watched metric in personal finance.
Why savings rate matters more than income
Two people earning very different salaries can build wealth at the same pace if they save the same percentage of income. Savings rate — not raw income — is what actually drives how fast your financial goals get closer.
What counts as an expense here
Include everything that leaves your account regularly: rent/mortgage, utilities, food, subscriptions, debt payments, insurance — anything that isn't going into savings or investments.