Budget Calculator
Enter your monthly take-home income and spending by category to see what's left over and how your budget compares to the 50/30/20 guideline.
Last updated: September 5, 2026
Frequently asked questions
What is the 50/30/20 budgeting rule?
A guideline that splits after-tax income into roughly 50% needs (housing, food, utilities), 30% wants (discretionary spending), and 20% savings or extra debt payoff - popularized as a simple starting framework, not a strict formula.
What counts as a 'need' versus a 'want'?
Needs are costs you can't avoid without real hardship - rent/mortgage, groceries, utilities, minimum debt payments. Wants are discretionary - dining out, entertainment, subscriptions. The line isn't always sharp, but the split is meant to be a rough guide, not an exact accounting standard.
What if my expenses add up to more than my income?
The calculator shows you're over budget by the shortfall amount - that's a signal to either reduce spending in a category, find additional income, or both, before it compounds into debt.
Should my income here be gross or after-tax?
Use after-tax (take-home) income - it reflects money actually available to spend or save, which is what a monthly budget is built around.
What if I don't have a 'housing' or 'transportation' cost some months?
Enter 0 for any category that doesn't apply to you - the calculator just sums whatever categories have a value, so leaving one at zero simply excludes it from your total spending and the needs/wants comparison.
How is the 20% savings portion calculated if I don't enter a separate savings amount?
The calculator infers it: it subtracts your total entered expenses from your income, and whatever's left over is treated as your effective savings/leftover rate to compare against the 20% target - it isn't a category you fill in directly.
Is a 50/30/20 budget the same as a zero-based budget?
No - the 50/30/20 rule sets broad percentage targets across three buckets (needs, wants, savings) without assigning every dollar a specific job. A zero-based budget assigns every dollar of income to a specific category until income minus allocations equals zero, which is a more granular approach than this calculator models.