Budget Calculator
A budget calculator helps you allocate your income across spending categories, track expenses, and ensure you're saving enough for financial goals. The right budget creates a plan for every dollar.
The 50/30/20 Budget Rule
| Category | Percentage | Example ($5,000 income) |
|---|---|---|
| Needs | 50% | $2,500 |
| Wants | 30% | $1,500 |
| Savings/Debt | 20% | $1,000 |
Budget Breakdown by Category
Needs (50%): Rent/mortgage, utilities, groceries, insurance, minimum debt payments, transportation to work, healthcare
Wants (30%): Dining out, entertainment, subscriptions, hobbies, vacations, upgrades
Savings (20%): Emergency fund, retirement, debt payoff above minimums, other savings goals
Budget Calculator Implementation
``javascript
function calculateBudget(monthlyIncome, method = '50-30-20') {
const budgets = {
'50-30-20': { needs: 0.50, wants: 0.30, savings: 0.20 },
'70-20-10': { needs: 0.70, wants: 0.20, savings: 0.10 },
'80-20': { needsAndWants: 0.80, savings: 0.20 },
'aggressive': { needs: 0.50, wants: 0.20, savings: 0.30 }
};
const allocation = budgets[method] || budgets['50-30-20'];
const result = {};
for (const [category, percent] of Object.entries(allocation)) {
result[category] = {
percent: (percent * 100) + '%',
monthly: (monthlyIncome * percent).toFixed(2),
weekly: (monthlyIncome * percent / 4.33).toFixed(2)
};
}
return result;
}
console.log(calculateBudget(5000, '50-30-20'));
// { needs: { percent: '50%', monthly: '2500', weekly: '577.37' }, ... }
``
Adjusting Your Budget
If you can't fit into 50/30/20, focus on reducing the largest category first (usually housing). Consider increasing income, reducing wants, or finding a more aggressive savings method once high-interest debt is paid.