Monthly Budget Calculator
A budget is the foundation of every financial plan, because you can't direct your money toward your goals until you know where it's actually going, and most people are surprised by how much leaks toward low-value spending once they track it. This calculator helps you total your monthly income and expenses across major categories so you can see your surplus or shortfall at a glance and identify where to cut or redirect spending. Enter your income sources and your expenses by category — housing, transportation, food, utilities, insurance, debt payments, and discretionary spending — and the calculator returns your total income, total expenses, and your monthly surplus or shortfall, plus the percentage of income going to each category. A useful framework is the 50/30/20 rule: aim to spend about 50% of your income on needs, 30% on wants, and 20% on savings and debt payoff, and the category breakdown shows whether your spending aligns with that target. If you're running a shortfall, the calculator makes the fix visible — you can see exactly which categories to trim — and if you have a surplus, you can direct it toward an emergency fund, debt payoff, or investing. Tracking your budget monthly builds awareness, which is the single most effective driver of better financial decisions, and the act of recording spending alone tends to reduce it. Use this calculator to build your first budget, to find your surplus for savings and investing, and to revisit your spending periodically as your income and expenses change.
Monthly Budget Calculator
Total your income and expenses to see your monthly surplus.
Monthly expenses
Monthly surplus
$1,500
Savings rate: 30.0%
Total income
$5,000
Total expenses
$3,500
The 50/30/20 rule suggests allocating roughly 50% to needs, 30% to wants, and 20% to savings. A positive savings rate is the foundation of building wealth — aim to increase it over time.
About This Calculator
A budget is the foundation of every financial plan, because you can't direct your money toward your goals until you know where it's actually going, and most people are surprised by how much leaks toward low-value spending once they track it. This calculator helps you total your monthly income and expenses across major categories so you can see your surplus or shortfall at a glance and identify where to cut or redirect spending. Enter your income sources and your expenses by category — housing, transportation, food, utilities, insurance, debt payments, and discretionary spending — and the calculator returns your total income, total expenses, and your monthly surplus or shortfall, plus the percentage of income going to each category. A useful framework is the 50/30/20 rule: aim to spend about 50% of your income on needs, 30% on wants, and 20% on savings and debt payoff, and the category breakdown shows whether your spending aligns with that target. If you're running a shortfall, the calculator makes the fix visible — you can see exactly which categories to trim — and if you have a surplus, you can direct it toward an emergency fund, debt payoff, or investing. Tracking your budget monthly builds awareness, which is the single most effective driver of better financial decisions, and the act of recording spending alone tends to reduce it. Use this calculator to build your first budget, to find your surplus for savings and investing, and to revisit your spending periodically as your income and expenses change.
Disclaimer: This calculator provides estimates for educational purposes only and does not constitute financial, tax, or investment advice. Results depend on assumptions that may not reflect your actual situation.
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Written by
James MitchellSenior Financial Analyst & Personal Finance Expert
Certified Financial Planner (CFP) • MBA in Finance, University of Chicago Booth School of Business