Budget Calculator
Free Budget Calculator for financial. Enter your values to compare options, see amortization, and plan smarter. Free, formula-verified, no signup needed.
Formula
Remaining = Income - Total Expenses
Track all income and expenses to see what remains. Aim for positive cash flow with 20%+ going to savings.
Worked Examples
Example 1: 50/30/20 Budget
Problem:Apply 50/30/20 to $4,000 monthly income.
Solution:Needs (50%): $2,000 - Housing: $1,200 - Utilities: $150 - Food: $400 - Transport: $250 Wants (30%): $1,200 - Entertainment, dining, hobbies Savings (20%): $800
Result:$2,000 needs, $1,200 wants, $800 savings
Example 2: Emergency Fund
Problem:Monthly expenses $3,500. How much for 6-month emergency fund?
Solution:Emergency fund = Monthly expenses × 6 = $3,500 × 6 = $21,000 Save $500/month = 42 months Save $1,000/month = 21 months
Result:$21,000 target
Example 3: Housing Affordability
Problem:Income $6,000/month. Max housing budget?
Solution:28% rule: $6,000 × 0.28 = $1,680 25% of take-home (after 25% taxes): $4,500 × 0.25 = $1,125 Aim for $1,125-$1,680/month including utilities.
Result:$1,125-$1,680/month
Frequently Asked Questions
How do I budget with irregular income?
Budget based on lowest expected income. When income is higher, prioritize: 1) essentials, 2) emergency fund, 3) debt, 4) savings. Build larger emergency fund (6+ months).
Should I include debt payments in my budget?
Yes! List minimum payments in fixed expenses. Allocate extra to highest-interest debt (avalanche) or smallest balance (snowball). Track separately from regular spending.
What expenses do people often forget?
Annual subscriptions, car maintenance, medical copays, gifts, home repairs, pet costs, clothing, personal care. Include these as monthly averages in your budget.
What if I can't stick to my budget?
Be realistic—too strict fails. Build in fun money. Use percentages, not fixed amounts. Identify triggers for overspending. Celebrate small wins. Adjust categories as needed.
What is the 50/30/20 budget rule?
It allocates take-home pay into three buckets: 50% to needs, 30% to wants, and 20% to savings and debt repayment beyond minimum payments. Needs are the obligations that continue whether or not your circumstances change — housing, utilities, groceries, insurance, transport to work, minimum debt payments. Wants are everything discretionary, including the subscriptions and dining out that most people misfile as necessities. The rule's value is not the specific percentages, which were never derived from research, but that it forces the savings share to be decided first rather than being whatever happens to survive the month. Treat it as a diagnostic: if needs alone exceed 50% of net pay, the problem is a fixed-cost problem and no amount of discretionary trimming will fix it.
Should the budget use gross or net income?
Use net income — the amount that actually lands in your account after tax, payroll deductions, and any employer retirement contribution. Budgeting from gross income overstates spending capacity by anywhere from 20% to 40% depending on your tax situation and benefit elections, which is the single most common reason a plan that balanced on paper fails in practice. One nuance: if you already contribute to a workplace retirement plan through payroll, that money never appears in net pay, so count it toward your savings share separately rather than assuming the 20% must come entirely out of what you can see.
How is a zero-based budget different?
A zero-based budget assigns every unit of income a specific job until nothing is unallocated — income minus all assignments equals zero. That is not the same as spending everything; savings, debt payoff, and sinking funds are assignments too. Percentage-based frameworks tell you the shape of your spending, while zero-based budgeting tells you where each specific dollar goes this month, which makes it far better at catching leakage. The trade-off is effort: it needs a monthly reset and honest reconciliation against actual transactions, so most people who succeed with it keep the category count low, around ten to fifteen rather than forty.
What is a sinking fund in a budget?
A sinking fund is money set aside monthly for a known irregular expense, so the cost never arrives as a shock. Car insurance billed twice a year, annual subscriptions, holiday travel, property tax, and predictable maintenance all belong here. The mechanic is simple: total the annual cost, divide by twelve, and treat that figure as a fixed monthly line. This is what separates budgets that survive from budgets that collapse in month four — those irregular bills are not emergencies, they are entirely foreseeable, and funding them monthly stops them from being paid on credit. Keep sinking funds separate from the emergency fund, which exists for genuinely unforeseeable events.
How do I budget with a variable monthly paycheck?
Budget from a floor rather than an average. Take the lowest month from the past twelve and build the plan so essential costs are fully covered at that level; anything above the floor in a good month goes to a buffer account rather than being spent. Once the buffer holds one to two months of essential costs, you can pay yourself a fixed amount from it each month and let the buffer absorb the variability, which converts an irregular income into a predictable one. Percentage-based savings rules work well here — committing a fixed share of every payment rather than a fixed dollar amount means the plan scales automatically with a strong month.
Why does my budget fail after two months?
Almost always because it was built from an idealised month rather than a real one. Budgets constructed from what you think you spend leave out the irregular categories — gifts, repairs, annual renewals, medical costs — and the first time one lands, the plan breaks and gets abandoned. The fix is to build the first version from three months of actual bank and card transactions, categorised as they really occurred, and only then decide what to change. The second failure mode is over-restriction: cutting discretionary spending to near zero produces the same rebound as a crash diet, so leave a genuinely unmonitored personal allowance in the plan.