Monthly budget calculator (50/30/20 rule)
A monthly budget splits net income into clear buckets so you know how much you can spend and how much to set aside. This tool applies the 50/30/20 rule (or the beginner-friendly 70/20/10 alternative) instantly.
With net income $10,000 and the 50/30/20 rule:
- Needs (50%): $5,000
- Wants (30%): $3,000
- Savings & investing (20%): $2,000/month → $24,000/year
What this tool calculates
- Monthly caps for needs, wants, and savings
- Side-by-side 50/30/20 vs 70/20/10
- Annual savings if you keep the savings percentage
- Educational guidance only (not personalized financial advice)
Currency is just a label: use USD, GTQ, or another unit. The math is percent of net income.
Allocation formula
Needs = net_income × (needs% / 100) Wants = net_income × (wants% / 100) Savings = net_income × (savings% / 100) Annual savings ≈ monthly savings × 12
Worked example (defaults)
Inputs: net income $10,000 · method 50/30/20
- Needs = 10,000 × 0.50 = $5,000
- Wants = 10,000 × 0.30 = $3,000
- Savings = 10,000 × 0.20 = $2,000
- Annual savings = 2,000 × 12 = $24,000
Same income with 70/20/10: needs $7,000, wants $2,000, savings $1,000 (annual $12,000). Better when fixed costs already exceed 50%.
Scenario tables (same engine logic)
Amounts rounded to 2 decimals like the calculator.
50/30/20 rule
| Net income | Needs (50%) | Wants (30%) | Savings (20%) | Annual savings |
|---|---|---|---|---|
| $5,000 | $2,500.00 | $1,500.00 | $1,000.00 | $12,000.00 |
| $7,500 | $3,750.00 | $2,250.00 | $1,500.00 | $18,000.00 |
| $10,000 | $5,000.00 | $3,000.00 | $2,000.00 | $24,000.00 |
| $12,000 | $6,000.00 | $3,600.00 | $2,400.00 | $28,800.00 |
| $15,000 | $7,500.00 | $4,500.00 | $3,000.00 | $36,000.00 |
| $20,000 | $10,000.00 | $6,000.00 | $4,000.00 | $48,000.00 |
70/20/10 rule (same incomes)
| Net income | Needs (70%) | Wants (20%) | Savings (10%) | Annual savings |
|---|---|---|---|---|
| $5,000 | $3,500.00 | $1,000.00 | $500.00 | $6,000.00 |
| $10,000 | $7,000.00 | $2,000.00 | $1,000.00 | $12,000.00 |
| $15,000 | $10,500.00 | $3,000.00 | $1,500.00 | $18,000.00 |
| $20,000 | $14,000.00 | $4,000.00 | $2,000.00 | $24,000.00 |
What goes in each bucket
| Category | Typical examples | 50/30/20 % |
|---|---|---|
| Needs | Rent/mortgage, basic groceries, utilities, commute, minimum insurance, minimum debt payments | 50% |
| Wants | Dining out, streaming, hobbies, non-essential shopping, entertainment | 30% |
| Savings & investing | Emergency fund, goals, investments, extra principal on debt | 20% |
Housing and net income
- A common housing guide is about 30% of net income for rent/mortgage (inside the needs bucket).
- Always budget from net pay (after taxes and payroll deductions), not gross.
- If rent + utilities already crush the 50% needs cap, try 70/20/10 before dropping savings entirely.
Habits that make the budget stick
- Track spending for 1–2 weeks to calibrate real categories.
- Automate savings on payday (pay yourself first).
- Review weekly: not only at month-end.
- Adjust the method if fixed costs are high; don’t quit tracking.
- Pair with debt payoff and debt-to-income ratio when credit is heavy.
This calculator is educational. It is not personalized financial, tax, or legal advice. Percentages are starting points: dependents, high housing costs, or expensive debt may require a different split.
FAQ
Allocate 50% of net income to needs, 30% to wants, and 20% to savings and investing (or extra debt payments). It’s a starting framework, not a law.
With 50/30/20: $2,000/month and $24,000/year. With 70/20/10: $1,000/month and $12,000/year.
When fixed costs (housing, transport, basics) regularly exceed 50% of net income. 70/20/10 gives needs more room while still reserving 10% for savings.
Use net (take-home). Gross overstates every bucket and hides taxes and contributions.
Contractual minimums usually sit in needs. Extra principal payments belong in the savings/debt 20% (or 10% under 70/20/10).
This page is a full monthly budget planner with method comparison. For the classic split only, also try the 50/30/20 rule calculator.
A frequent guide is up to ~30% of net income. Adjust for your city and protect the savings line whenever you can.