Monthly Budget Calculator
Are you spending more than you earn?
Most people have no idea where their money actually goes. They earn a good income, pay their bills, spend on things they want, and find themselves with nothing left at the end of the month. Not because they're irresponsible β but because they've never laid it all out in one place and done the math. This calculator does that. Enter your monthly take-home income and every expense category β housing, transportation, food, utilities, insurance, healthcare, debt payments, savings, entertainment, clothing, and more. You'll see total expenses against income, your remaining surplus or deficit, and what percentage of income goes to each category. More useful than the total: the 50/30/20 breakdown. Every expense is categorized as a need (essential), want (discretionary), or savings. You'll see what percentage falls into each bucket and how it compares to the 50/30/20 guideline β 50% needs, 30% wants, 20% savings. Most people discover they have a $300β$800 monthly surplus they're not aware of β money disappearing into small, untracked expenses. Others find a hidden deficit being masked by credit card balances. Either way, knowing is the only path to changing it.
- Β·Uses take-home (after-tax) income, not gross salary
- Β·The 50/30/20 rule is a guideline β high cost-of-living areas often require more than 50% on needs
- Β·Pre-tax 401(k) contributions are counted as savings even though they reduce take-home pay β enter them explicitly
- Β·Expense categories are suggestions β customize to match your actual spending
Surplus/Deficit = Monthly take-home income β Total monthly expenses 50/30/20 percentages: Β· Needs % = Sum of essential expenses Γ· Take-home income Γ 100 Β· Wants % = Sum of discretionary expenses Γ· Take-home income Γ 100 Β· Savings % = Sum of savings and extra debt payments Γ· Take-home income Γ 100 Needs include: rent/mortgage, utilities, groceries, minimum debt payments, basic transport, health insurance. Wants include: dining out, streaming, gym, entertainment, clothing beyond basics, travel. Savings include: emergency fund, retirement contributions, investments, extra debt payments above minimums.
- βBuilding a budget from scratch β enter what you actually spend, not what you wish you spent
- βAfter a major life change β new job, new city, new rent, new family member
- βWhen you feel financially stuck despite a decent income β find where the money is leaking
- βPlanning a savings goal β see how much is actually left over each month
- βDeciding whether you can afford a new expense β see the real impact
Example 1: $5,400/month take-home β finding the leak
Inputs: Income: $5,400 Β· Rent: $1,450 Β· Groceries: $320 Β· Utilities: $180 Β· Transport: $240 Β· Dining out: $420 Β· Subscriptions: $95 Β· Entertainment: $180 Β· Clothing: $150 Β· Savings: $300 Β· Student loan: $280
Result: Total expenses: $3,615 Β· Surplus: $1,785 Β· Needs: 46% Β· Wants: 20% Β· Savings: 6% Β· Unaccounted: $1,785
The $1,785 'surplus' isn't being saved β it's disappearing into untracked small expenses. The savings rate is 6% when it should be 20%. The fix starts with finding what the $1,785 is actually buying.
Example 2: Deficit situation β where to cut
Inputs: Income: $4,200 Β· Rent: $1,600 Β· Car payment: $380 Β· Car insurance: $140 Β· Groceries: $350 Β· Utilities: $160 Β· Dining: $400 Β· Subscriptions: $120 Β· Entertainment: $200 Β· Minimum payments: $250 Β· Savings: $200
Result: Total expenses: $3,800 Β· Surplus: $400 Β· Needs: 69% (vs 50% target) Β· Wants: 24% Β· Savings: 5%
Housing + car absorb 50% of income alone β before any other bills. With needs at 69%, there's no path to the 20% savings target without restructuring the fixed costs. The car payment is the highest-leverage item to address.
Budget Health Calculator
50/30/20 Analysis Β· Savings Rate Β· Category Breakdown Β· Projections
Results update in real time as you adjust any input.
After taxes β the amount you actually receive each month.
Needs β Essential Expenses
Wants β Discretionary Spending
Savings & Goals
About This Calculator
This budget health calculator analyzes 15 inputs in real time across 13 spending categories. Needs = housing + food + transportation + utilities + insurance + healthcare + debt payments. Wants = entertainment + clothing + personal care + other. Savings = monthly savings + investments. Surplus = income - (needs + wants + savings). Savings rate = savings / income. Score (0-100): savings rate (30 pts) + needs percentage (25 pts) + surplus (20 pts) + housing ratio (15 pts) + debt-to-income (10 pts). Dynamic accent: emerald (Healthy 80+), indigo (Needs Improvement 60+), amber (Under Pressure 40+), red (Budget Crisis). Six auto-trigger risk flags: deficit, housing above 35%, DTI above 36%, savings rate below 10%, needs above 70%, emergency fund below 3 months.
The Breakdown tab renders a donut PieChart (13 categories, colour-coded by type: indigo spectrum for needs, amber for wants, emerald for savings) with a custom legend showing name and monthly amount, plus a horizontal grouped BarChart comparing actual vs ideal percentage for the top 8 categories by spend. The 50/30/20 tab renders a grouped bar chart of needs/wants/savings showing actual (solid, accent colour) vs target (outlined, grey) for all three buckets, plus a line chart of savings accumulation over 1-36 months, plus a full 13-row category table with status. The Scenarios tab renders a bar chart of 5 spending cut scenarios with current savings and 20% target reference lines, plus a scenario table with new savings rate and vs-target delta. The Insights tab shows 4 insights (budget summary, largest expense + 50/30/20 analysis, savings rate with compounding, housing or debt or emergency fund depending on biggest concern) and 4 conditional What To Do Next steps based on budget score tier.
Results are estimates only and do not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.
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- βEntering what you plan to spend rather than what you actually spend β the budget lies to itself
- βForgetting irregular expenses like car registration, annual subscriptions, or holiday gifts β divide annual costs by 12 and include monthly
- βNot including minimum debt payments as fixed expenses β they're as non-negotiable as rent
- βTreating take-home pay as gross salary β budget from what hits your bank account
- βSkipping the savings line when money is tight β automate savings first, budget from what remains
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