Budget Calculator

This budget calculator adds up what comes in, subtracts everything that goes out, and tells you what is left. Every line has its own Month or Year toggle, so rent goes in monthly and car insurance goes in annually without you converting anything by hand, and one toggle at the top switches the whole summary between a monthly and a yearly view. The result sits directly under your entries, with the category breakdown and a comparison against the 50/30/20 rule below it.

What a budget actually is

A budget is a plan for money you have not spent yet. It sets out expected income and assigns each dollar of it a job before the month starts, which is the part that separates budgeting from simply looking at last month's bank statement.

People build one for a specific reason: clearing credit card balances, saving a house deposit, surviving on an irregular income, or working out why the money keeps disappearing. The method barely matters. A spreadsheet, an app, a notebook, and this page all work, and the one that works best is whichever you will still be using in six months.

Living within your means

Every budget comes down to spending less than you earn, and the reasons people fail at it are consistent:

• Spending more than the income supports. The gap gets filled with credit, and the interest on that credit widens the gap next month.
• Matching the people around you. Cars, holidays, and houses are visible; the debt behind them is not. Comparing your spending to your neighbour's is comparing against numbers you cannot see.
• Treating credit as income. A card raises your spending ceiling without raising what you earn, and the ceiling has to be repaid.
• Not knowing the numbers. Most people can name their salary and almost none can name their total annual spending. The second figure is the one that decides whether the first is enough.

Planning for what has not happened yet

Companies run whole departments on forecasting because knowing what is coming changes what you do now. The same applies to a household, and the costs that wreck budgets are almost never the ones people forget exist. They are the ones that arrive annually: insurance renewals, car registration, holiday spending, a service on the boiler.

The fix is a sinking fund. Take the annual cost, divide by twelve, and set that aside every month so the bill is already paid when it lands. A $1,200 insurance renewal is a crisis in month twelve and $100 a month the rest of the time. This is exactly why each row here has a Year toggle: enter the real annual figure and the calculator spreads it for you.

Planning also covers the things you cannot schedule. An emergency fund of three to six months of expenses is the difference between a broken transmission being an inconvenience and being the start of a credit card balance that takes two years to clear.

The income side

Most people's income is a salary, with investment income and side work behind it. Enter the gross figure and set the tax rate underneath: use your effective rate, which is total tax divided by total income, not your marginal bracket. Someone in the 24% bracket usually pays an effective rate closer to 17% once deductions and the lower brackets are counted, and using the wrong one understates your take-home by thousands. The Take-Home Pay Calculator gives you the exact number.

Raising income is the other half of a budget and the half with no ceiling. New job, new qualification, new skill, a second income stream, a negotiated raise. Cutting expenses has a floor: rent, food, and insurance can only fall so far. Earning more does not.

In retirement Social Security becomes the base layer, claimable from 62 at a permanently reduced rate, and roughly 30% higher if you wait until 70. Model that decision before you make it, because it is irreversible after twelve months.

Housing and utilities

Housing is the biggest line in almost every budget, so a change here moves the total further than anything else you can do. The rule of thumb is 30% of gross income, a figure that traces back to US housing policy in 1981, and HUD still calls a household spending more than 30% cost burdened and more than 50% severely cost burdened.

If you are well past 30%, the options are structural rather than clever: refinance, move somewhere cheaper, downsize, or take in a lodger. Efficiency measures like a programmable thermostat, LED bulbs, or better insulation trim utilities by a useful amount, but they will not rescue a rent that is 45% of your income. The House Affordability Calculator shows what price actually fits.

Transportation

Car payments are the second biggest fixed cost for most households. A common guide keeps the payment under 10% of gross income and total transportation, including fuel, insurance, and maintenance, under 15%.

The number is set almost entirely at the point of purchase, so the cheapest decision you will ever make about a car is which car. After that, the savings are smaller: keeping tyres properly inflated, servicing on schedule, driving gently, and avoiding tickets that raise your insurance for years. Where public transport, cycling, or a one-car household is workable, dropping a vehicle removes a payment, an insurance policy, maintenance, and fuel in one move. The Auto Loan Calculator prices the payment before you commit to it.

Debt payments

Credit cards are not the problem; carrying a balance is. Used inside a budget and cleared monthly, a card is a payment method with rewards and fraud protection. Carried at 22% interest, it quietly becomes one of your larger monthly bills.

Lenders judge this with two ratios, and so should you. The front-end ratio is housing divided by gross monthly income; the back-end ratio adds every other debt payment. The traditional target is 28% and 36%, and this calculator reports both. Above 43% back-end, most mortgage lenders stop saying yes. The Debt-to-Income Ratio Calculator goes into it in more depth.

One mechanical warning: do not double count. If a restaurant meal went on a credit card, it belongs in Meals Out or in Credit Card, not both. The same applies to tuition paid by student loan. Double counting is the most common reason a budget shows a deficit that does not exist.

Living expenses

Groceries, clothing, household supplies, and eating out look small next to rent and add up faster than anything else on the page. Food and Meals Out together should generally stay under about 15% of income.

Meals Out is usually the single most elastic line in a budget. Cooking at home typically costs a third of the restaurant equivalent, so shifting a few meals a week moves real money without touching anything structural. It is also the change most people can make this week, which matters more than the size of the saving.

Healthcare

Health spending in the US runs close to $14,500 per person a year on national health expenditure figures, though what a household actually pays depends on employer coverage, deductibles, and use. Figures nearer $10,000 that circulate in older articles are a decade out of date.

This is the least flexible category in a budget, but not entirely fixed. Staying in network, re-shopping insurance at each open enrolment rather than auto-renewing, asking for generic prescriptions, and using a Health Savings Account all reduce the bill. An HSA is worth understanding properly: contributions are deductible, growth is untaxed, and withdrawals for medical costs are untaxed, which is a combination no other account offers. The 2025 limits are $4,300 for individual coverage and $8,550 for a family, plus $1,000 more from age 55.

Children and education

Raising a child costs somewhere in the region of $300,000 to eighteen for a middle-income family, before any college costs. It is less a category to cut than one to plan for, ideally starting before the child arrives.

Education has the strongest return of any spending in this list, with median earnings rising sharply at each level of qualification. That does not make every degree at every price worthwhile, and it does not make private borrowing sensible when federal aid exists. Borrowers juggling several high-rate student loans should look at consolidation, weighing the simpler single payment against the longer term and the benefits it can cancel.

Savings and investments

A healthy budget sends 15% or more of income to the future, counting retirement contributions, an emergency fund, and any college saving. Employer matching counts toward that total, and skipping a match is declining part of your salary.

Order matters more than amount when you are starting. Build a small buffer of about $1,000, capture the full employer match, clear anything above roughly 8% interest, build the fund to three to six months, then increase retirement contributions toward 15%. The Savings Calculator and Retirement Calculator project where those contributions end up.

Miscellaneous, and where to cut first

Pets, hobbies, entertainment, subscriptions, travel. This is the most flexible part of any budget and the first place to look when the number at the bottom is negative. It is also where blanket austerity fails: a budget with no room in it gets abandoned within a couple of months, the same way a diet with no food you like does.

Audit subscriptions annually rather than agonising over each coffee. Recurring charges are designed to be forgotten, and cancelling four unused ones is worth more than a month of denying yourself small pleasures.

Getting the numbers right in the first place

Most budgets fail at the input stage rather than the discipline stage. People estimate their spending, and the estimates are consistently low, because the memorable purchases are the large ones while the damage is done by frequency. Twelve dollars, four times a week, is $2,496 a year that nobody remembers agreeing to.

Before filling this page in, pull the last three months of bank and card statements and total each category properly. Three months rather than one, because a single month always misses something: the quarterly water bill, the annual renewal, the birthday. If your bank categorises transactions automatically, check its work rather than trusting it, since transfers between your own accounts routinely get counted as spending and a supermarket that also sells fuel files everything under groceries.

Then keep the budget honest by reviewing it monthly against what actually happened. A budget is a forecast, and forecasts are wrong; the value is in seeing by how much and adjusting. Expect the first two or three months to need real corrections, and expect the categories you underestimated to be food, miscellaneous, and anything that bills annually. Once the numbers settle, a review takes ten minutes and the rest of the month runs itself.

Frameworks that work

• 50/30/20: half of after-tax income to needs, 30% to wants, 20% to savings and extra debt payments. The chart on this page scores you against it directly.
• Zero-based: assign every dollar of income a job until nothing is unallocated. Precise, effective, and more work each month.
• Pay yourself first: automate the savings transfer for payday and live on the rest. The least disciplined method and often the most successful, because it removes the decision.
• Envelopes: a fixed allowance per category, in cash or in separate accounts. Spending stops when the envelope is empty, which is the point.

Reading your results

The panel under your entries shows the surplus or deficit first, since that is the number that decides everything else, then income before and after tax, total expenses, the expense-to-income ratio, your savings rate, and both debt ratios. Flip the toggle at the top to see all of it annually, which is the view that makes a $40 monthly leak look like the $480 a year it really is.

The donut shows which categories are consuming the money, and the bar chart puts your needs, wants, and savings against the 50/30/20 targets. If the deficit is large, ignore the small lines and look at the three biggest bars, because housing, transport, and food are where a budget is actually won.