Budget Calculator
On $5,000 a month after taxes, the 50/30/20 guideline sets aside $2,500 for needs, $1,500 for wants, and $1,000 for savings. This budget calculator turns your own numbers into a monthly spending plan. Enter your take-home pay, any other income, and what you spend across 10 common categories, from housing and groceries to dining out and savings. The result shows how much money is left over or how much you are short each month, your savings rate, what share of income each category takes, and how your plan compares with the 50/30/20 split. Use it to build a first budget, check a student or household budget before a new semester or lease, or find which line to cut when the month runs out before the paycheck does.
Quick answer
Left over = total monthly income minus total spending minus planned savings. A negative result is a shortfall.
Monthly income
Needs (monthly)
Wants (monthly)
Savings (monthly)
What this tells you
- •Left over = total monthly income minus total spending minus planned savings. A negative result is a shortfall.
- •Use take-home pay, the amount that lands in your bank account after taxes and payroll deductions, not your salary.
- •Savings rate = planned savings divided by total income. Payments above a debt minimum count as savings here.
- •Each category share = that category divided by total income, so you can see exactly where the money goes.
- •Needs are housing, utilities, groceries, transportation, insurance and health, minimum debt payments, and childcare.
- •Wants are dining out, entertainment, personal spending, and anything else you could cut in a tight month.
- •The 50/30/20 split is a starting point to compare against. High-rent areas often push needs above 50%.
How to Use
- 1Enter your monthly take-home pay. If you are paid every two weeks, multiply one paycheck by 26 and divide by 12.
- 2Enter other monthly income such as side work, child support, benefits, or financial aid. Leave it at 0 if you have none.
- 3Fill in each needs line with what you actually pay in a typical month. Check bank and card statements for the last 2 or 3 months.
- 4Fill in the wants lines for dining out, entertainment, shopping, gifts, and other flexible spending.
- 5Enter what you put toward savings, retirement, and debt payments above the minimum each month.
- 6Click Calculate to see your leftover or shortfall, savings rate, category shares, and the 50/30/20 comparison. Adjust any line and recalculate until the plan balances.
How It Works
Formula
Total income = take-home pay + other income
Total spending = needs + wants
Left over = total income - total spending - planned savings
Savings rate = planned savings / total income x 100
Category share = category amount / total income x 100
50/30/20 guideline = 50% needs, 30% wants, 20% savings of total incomeThe calculator adds your take-home pay and other income to get total monthly income. It then sorts the 10 expense lines into three buckets. Needs are the 7 lines you must pay to keep a home, eat, work, and stay current on debt. Wants are the 2 flexible lines. Savings is money set aside for the future, including extra debt payments beyond the minimum. Total spending is needs plus wants. Subtracting spending and planned savings from income gives the amount left over, and a negative figure means your plan spends more than you earn. Every share divides a dollar amount by total income, which is how the 50/30/20 guideline measures a budget. The guideline amounts are simply 50%, 30%, and 20% of total income, and the difference column shows how far each bucket sits above or below its target.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Single renter with money left over
Total income is $5,000. Needs add up to $3,200, or 64.0% of income, which is $700 above the 50% guideline. Wants come to $750 (15.0%) and savings to $600 (12.0%). Spending plus savings is $4,550, so $450 a month has no job yet. Moving that $450 into savings would lift the savings rate to 21.0%, past the 20% target, without touching any other line.
College student budget
A part-time job pays $1,600 and $900 a month in aid and family support brings total income to $2,500. Rent, utilities, groceries, a transit pass, health coverage, and $100 for books put needs at $1,700, or 68.0% of income. Wants are $450 (18.0%) and savings is $150 (6.0%). The plan spends and saves $2,300, leaving $200 a month as a cushion for surprise costs like a lab fee or a flight home.
Family of four with a shortfall
Needs alone total $6,020, which is 97.1% of the $6,200 take-home pay, so the guideline split is out of reach this year. Adding $550 of wants (8.9%) and $300 of savings puts the plan $670 over income. Cutting both wants lines in half saves $275, which still leaves a $395 gap. The bigger levers are on the needs side: shopping car insurance, refinancing a car payment, or claiming a dependent care benefit at work would do more than trimming takeout.
Plan that matches 50/30/20 exactly
Needs total $3,500, exactly 50% of $7,000. Wants total $2,100, or 30%, and savings is $1,400, or 20%. Every dollar is assigned, so the leftover is $0 and each difference column reads on target. A balanced plan like this is often called a zero-based budget, since income minus every planned dollar equals zero.
Average US Household Spending in 2024
Average spending per consumer unit from the Bureau of Labor Statistics Consumer Expenditure Survey, shown as a yearly total, a monthly figure, and a share of total spending. Use it as a reference point, not a target.
| Category | Per year | Per month | Share of spending |
|---|---|---|---|
| Housing | $26,266 | $2,188.83 | 33.4% |
| Transportation | $13,318 | $1,109.83 | 17.0% |
| Food (total) | $10,169 | $847.42 | 12.9% |
| Food at home | $6,224 | $518.67 | 7.9% |
| Food away from home | $3,945 | $328.75 | 5.0% |
| Personal insurance and pensions | $9,797 | $816.42 | 12.5% |
| Healthcare | $6,197 | $516.42 | 7.9% |
| Entertainment | $3,609 | $300.75 | 4.6% |
| All spending | $78,535 | $6,544.58 | 100% |
Source: US Bureau of Labor Statistics, Consumer Expenditures 2024 news release (bls.gov/news.release/cesan.nr0.htm). Yearly figures are BLS averages for all consumer units. Monthly figures divide each by 12. The housing, transportation, food, and healthcare shares are as published by BLS, and the other shares are computed from the yearly averages. Average income before taxes was $104,207, so these shares measure total spending, not income, and a budget built on take-home pay will show larger percentages for the same dollars.
How the 50/30/20 Budget Split Works
The 50/30/20 guideline was popularized by Elizabeth Warren and Amelia Warren Tyagi in their book All Your Worth. It splits after-tax income into three buckets: half for needs, 30% for wants, and 20% for savings and paying down debt. The appeal is speed. You only track three numbers instead of dozens of line items, and the split works at almost any income because it scales with your pay.
The hard part is deciding what counts as a need. This calculator treats housing, utilities, groceries, transportation, insurance and health costs, minimum debt payments, and childcare as needs, because skipping them carries real consequences. Restaurant meals, streaming, travel, and most shopping are wants. Retirement money deducted from your paycheck never reaches take-home pay, so the calculator cannot see it. To count it, add the deduction to other income and to the savings line. Any payment above a debt minimum belongs in savings, because it improves your net worth the same way a deposit does.
Housing is where most budgets break the guideline. BLS data puts housing at 33.4% of average household spending in 2024, and that share is measured against spending, not take-home pay. Against a smaller after-tax income, the same rent can easily take 35% to 45%. If your needs land well above 50%, the fix is usually one large line, such as rent, a car payment, or insurance, rather than many small cuts to wants.
Treat the result as a plan, then compare it with what really happens. Run the calculator with the amounts you intend to spend, track the month, and run it again with actual totals. Two or three months of real numbers will show which categories you underestimate. Irregular costs like car registration, holiday gifts, and annual subscriptions are easier to absorb if you divide the yearly cost by 12 and add it to the matching line.
Common mistakes
- Entering gross salary instead of take-home pay. Taxes, health premiums, and retirement deductions come out before the money reaches you, so a gross figure makes every share look smaller than it is.
- Converting biweekly pay by multiplying by 2. Biweekly pay arrives 26 times a year, so one paycheck times 26 divided by 12 gives the true monthly amount.
- Forgetting irregular bills. Annual insurance premiums, car registration, and holiday spending still need a monthly share, or they will look like a shortfall when they arrive.
- Counting the full credit card payment as a need. Only the required minimum is a need here, and anything extra belongs in savings and debt payoff.
- Guessing grocery and dining totals from memory. Most people underestimate food spending, so pull the last two or three months of card and bank statements.
- Treating 50/30/20 as a pass or fail grade. The split is a starting guideline, and a plan with needs at 60% can still work if it has no shortfall and some savings.
Limitations
This budget calculator models one typical month with fixed amounts. It does not track real transactions, forecast irregular expenses, or adjust for income that changes from month to month, so gig workers and commission earners should use a conservative income figure. The needs and wants labels follow common budgeting practice, and you may reasonably classify a line differently. Retirement contributions deducted from your paycheck are not counted as savings unless you add them to both other income and savings, because take-home pay already excludes them. The calculator does not compute taxes, so it relies on the take-home figure you enter. The BLS spending averages in the reference table describe all US consumer units and will differ from any single household by region, family size, and income.
Embed this calculator on your site
Paste this code where you want the calculator to appear. It is responsive, mobile-friendly, resizes automatically, and is free to use as long as the credit line stays in place.
<script src="https://calctide.com/embed.js" data-tool="budget-calculator" async></script>
<p style="font-size:12px;margin:4px 0 0">Budget Calculator by <a href="https://calctide.com/finance/budget-calculator/">CalcTide</a></p>Preview the embed at /embed/budget-calculator/.