The monthly budget calculator shows whether your spending fits your income, and by how much. Enter your monthly income and what you spend on housing, food, transport, utilities, and other expenses, press Calculate, and the calculator shows your total expenses, the amount remaining, your savings rate, and the share of your income that goes on expenses. All four results come from the same figures, so you can test a change, such as lower housing costs or a higher income, and see at once how the balance moves.
What Is a Monthly Budget?
A monthly budget is a plan for one month of money in and money out. Income is what you receive in the month, and expenses are what you spend in the same month. When expenses are lower than income, the difference is the amount remaining, which is the most you can save, pay toward debt, or set aside without borrowing. When expenses are higher than income, the amount remaining is negative, which means the month is funded from savings or debt. A budget is not a judgment about your spending; it is a way to see the whole month on one screen, so a single large category cannot hide behind a small total.
How to Use the Calculator
- Enter your monthly income: the money you receive in a month, after tax if you want the budget to match what you can actually spend.
- Enter each expense category for the same month: housing, food, transport, utilities, and other expenses. Put every other cost in Other expenses, and leave a category at zero if it does not apply.
- Press Calculate and read all four rows: total expenses, amount remaining, savings rate, and expenses share of income.
- Change any figure and calculate again to test a different rent, a cheaper month, or a pay rise.
Worked Example
With the starting figures, the four rows are easy to check by hand. Income is 5,000. The expenses add up to 1,500 plus 800 plus 400 plus 300 plus 500, which is 3,500. The amount remaining is 5,000 minus 3,500, which is 1,500. The savings rate is 1,500 divided by 5,000, which is 30.00%. The expenses share of income is 3,500 divided by 5,000, which is 70.00%. The two percentages add to 100%, which is a useful check: every part of the income is either spent or remaining. Try an overspend instead: keep the income at 5,000 and raise housing to 4,000. Total expenses become 6,000, the amount remaining is minus 1,000, the savings rate is minus 20.00%, and the expenses share is 120.00%.
The Four Results Explained
The first row, total expenses, is the sum of the five categories. Use it to see the size of the month at a glance, and to check that no category was entered twice. The second row, amount remaining, is income minus total expenses. A positive figure is the most the month can save; a negative figure is the shortfall that must come from savings or borrowing. The third row, savings rate, is the amount remaining as a percentage of income. It shows what share of the month is left over, which is the figure most people track over time. The fourth row, expenses share of income, is total expenses as a percentage of income. When it passes 100%, spending is greater than income, however the expenses are grouped.
Common Budget Mistakes
The most frequent mistake is budgeting with gross income, before tax and deductions, and then wondering why the money runs out. Use the income that actually reaches you if you want the remaining figure to be spendable. The second mistake is forgetting irregular costs, such as annual insurance, car repairs, or holiday spending, which belong in Other expenses in the month they are paid, or spread across months as an average. The third mistake is treating the amount remaining as savings that have already happened: it is only savings once it is moved out of the spending account. Finally, a budget built from one unusual month, such as a holiday month, will mislead the next month, so run the calculator with a typical month as well as the month you are in.
Who Uses This Calculator
Households use it to check whether rent, food, and bills leave room to save, and to see which category moves the total most. Students use it to stretch a monthly allowance or part-time income across fixed and variable costs. Savers use it to set a target savings rate and work out how much spending must fall to reach it. Anyone facing a pay change, a move, or a new bill uses it to test the new month before it starts, rather than discovering the shortfall at the end of it.
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Frequently Asked Questions
What is a good savings rate?
There is no single good rate. A common starting target is 20% of income, but the right figure depends on fixed costs, debt, and what the savings are for. This calculator shows your rate for one month; the useful comparison is with your own previous months, not with a rule of thumb.
What if my expenses are higher than my income?
The amount remaining will be negative, the savings rate will be negative, and the expenses share will be above 100%. That means the month needs savings or borrowing to cover it. Reduce one category at a time and recalculate to see which change closes the gap.
Should I enter gross or net income?
Enter net income, the amount you actually receive, if you want the amount remaining to match money you can spend or save. Entering gross income will overstate what is left, because tax and deductions are not available to spend.
Which expenses go in Other expenses?
Everything that is not housing, food, transport, or utilities: subscriptions, clothing, health costs, debt payments, entertainment, and one-off costs. Grouping them together keeps the form short, but keep a note of the largest items so you can check them later.
What happens if an expense category is zero?
Nothing changes. A zero category adds nothing to the total, so the other rows are unaffected. Leave a category at zero rather than guessing a figure for it.
Can the amount remaining be negative?
Yes. A negative amount remaining means total expenses are greater than income for that month. It is not an error; it is the calculator showing that the month does not balance on income alone.
Does this calculator store my figures?
No. The calculation runs in your browser from the numbers you enter, and nothing is sent to a server or stored. You can close the page and the figures are gone.