Budget Calculator

What Is the Budget Calculator?

The Budget Calculator is a free online tool that turns your monthly take-home pay into a simple spending plan. It divides your income into three buckets: needs, wants and savings. The best-known way to do this is the 50/30/20 rule, where half of your income goes to needs, 30 percent to wants and 20 percent to savings and extra debt payments. The calculator uses that rule by default, but you can switch to two other common splits or type your own percentages.

A plan is only useful if you can check it against real life, so the tool also lets you enter what you actually spend in each bucket. It then compares your real numbers with the targets and marks each bucket with a green or red badge. You can see at a glance whether rent and bills are eating too much of your pay, whether fun spending has crept up, or whether you are saving as much as you meant to.

What the Calculator Can Do

• Four split options. Choose 50/30/20 (the classic rule), 60/20/20 (for people with high fixed costs), 70/20/10 (for a tight budget), or Custom split.
• Custom percentages. With Custom split selected, the Needs %, Wants % and Savings % boxes become editable. They must add up to exactly 100, and the tool shows an error with the current total if they do not.
• Monthly targets. Three summary cards show the monthly amount for needs, wants and savings.
• Monthly and yearly view. The results table shows each bucket's target per month and per year, and the main card shows your yearly income.
• Split bar. A coloured bar shows the size of each bucket: blue for needs, orange for wants and green for savings, with the percentage next to each label.
• Target versus actual. Enter your real monthly spending for any bucket. The table shows the amount, what percent of your income it is, and a status badge.
• Clear status badges. For needs and wants, spending above target shows a red Over by badge and spending below target shows a green Under by badge. For savings the logic is reversed: saving less than the target shows a red Short by badge and saving more shows a green Ahead by badge. An exact match shows On target.
• Left over. When you enter actual figures, the Left Over card shows your income minus everything you entered. It turns red if you spent more than you earn.
• Optional comparison. Leave any actual box empty and that bucket simply shows Not entered.
• Eight currencies. USD, EUR, GBP, INR, BDT, CAD, AUD and JPY. The currency only changes how amounts are displayed.

Needs, Wants and Savings Explained

Most of the value of this method comes from sorting your spending honestly. Here is a simple way to think about each bucket.

Needs are the costs you must pay to live and work. Rent or mortgage payments, basic groceries, electricity, water, heating, basic phone and internet, transport to work, insurance and the minimum payment on any loan all belong here. If you stopped paying it, something serious would go wrong.

Wants are things that make life better but that you could cut if you had to. Eating out, takeaway coffee, streaming and other subscriptions, new clothes beyond the basics, hobbies, holidays and upgrades such as a bigger phone plan are wants. A want is not a bad thing. The point of the budget is to give it a fair, limited share.

Savings covers money you set aside for the future: an emergency fund, retirement contributions, saving for a house deposit, investing, and extra payments on debt above the minimum. Paying off a loan faster is treated as saving because it improves your future position in the same way.

Why a Budget Split Is Useful

Many people never budget because tracking every single purchase feels like too much work. A three-bucket split is much lighter. You only need three totals, and you get a clear answer about where your money is going. It also gives you a simple rule for new spending decisions: if a purchase is a want and your wants bucket is already full this month, it can wait.

The split also protects saving. When savings is a fixed share of income rather than whatever is left at the end of the month, it is far more likely to happen. Many people set up an automatic transfer for the savings amount on payday, then live on the rest.

Finally, the yearly figures put small habits in perspective. A wants budget of 1,200 a month looks modest, but the table shows it is 14,400 a year. Seeing that number can make it easier to decide what really matters to you.

How the Calculation Works

The maths is simple, and every figure on the page can be checked by hand:

• Bucket target per month = monthly take-home income x bucket percentage / 100.
• Bucket target per year = bucket target per month x 12.
• Actual share of income = actual spending in the bucket / monthly income x 100.
• Difference = actual spending - target. A positive difference on needs or wants means overspending. A positive difference on savings means you saved more than planned.
• Left over = monthly income - the sum of all actual amounts you entered.

Take the example values loaded on the page: a take-home income of 4,000 a month with the 50/30/20 split. Needs get 2,000 a month (24,000 a year), wants get 1,200 a month (14,400 a year) and savings get 800 a month (9,600 a year). The example actual spending is 2,200 on needs, 1,000 on wants and 800 on savings. Needs are 55 percent of income, so the badge reads Over by 200. Wants are 25 percent, so the badge reads Under by 200. Savings match the target exactly, so they show On target. The three actual figures add up to 4,000, so Left Over is 0.

With the same income, the 60/20/20 split gives 2,400 for needs, 800 for wants and 800 for savings. The 70/20/10 split gives 2,800 for needs, 800 for wants and 400 for savings.

All calculations happen in your browser with JavaScript. Nothing you type is sent to a server or saved.

How to Use the Budget Calculator

1. Choose the Currency you want to see amounts in.
2. Type your Monthly Take-Home Income. Use the amount that actually arrives in your bank account after tax and other deductions. If your pay changes from month to month, use a cautious average of the last few months.
3. Pick a Budget Split. Start with 50/30/20 unless you already know your fixed costs are high.
4. If you want your own split, choose Custom split and type the three percentages. Watch for the red message if they do not add up to 100.
5. Optionally, enter your Actual Monthly Spending for needs, wants and savings. Your bank statement for last month is the easiest source.
6. Read the results. The large figure is your monthly income, the cards show your monthly targets, and the table shows yearly amounts, actual spending and the status badge for each bucket.
7. Adjust and repeat. Try a different split, or change an actual figure to see how much you would need to cut to get back on target.

Click Reset to example at any time to return to the starting values.

Choosing the Right Split

The 50/30/20 rule is a starting point, not a law. If you live in a city with high rents, your needs may honestly take 60 percent or more of your pay. In that case the 60/20/20 split keeps saving at a healthy 20 percent by cutting wants instead. The 70/20/10 split is for tighter months, for example when you are on a lower income, paying off debt, or between jobs. It still keeps some money for savings so the habit is not lost.

If none of these fit, use Custom split. Some people who are saving hard for a goal choose something like 50/20/30, putting 30 percent into savings. Others who have just paid off a loan may move part of the old payment into wants for a while. The right split is one you can keep to month after month.

Practical Ways to Use It

• Your first budget. If you have never budgeted before, the default split gives you instant targets without building a spreadsheet.
• Monthly check-in. At the end of each month, enter your three actual totals and see which bucket drifted.
• After a pay rise. Enter your new income to see how much more each bucket gets, and decide how much of the rise to keep for savings.
• Planning a move. Before signing a lease, add the new rent to your other needs and see if needs still fit inside your chosen split.
• Couples and households. Enter combined take-home pay and combined spending to agree on shared targets.
• Teaching money basics. The three buckets and the coloured bar are an easy way to explain budgeting to teenagers and students.

Limitations

The calculator works with three totals only. It does not track individual transactions, sort your purchases into buckets for you, or connect to your bank. You decide what counts as a need or a want, and the result is only as good as that choice.

It works on one month at a time and assumes the same income every month. Irregular costs such as a yearly insurance bill or holiday spending are best divided by 12 and added to the right bucket as a monthly amount. If your income varies a lot, the targets will move with it, so use a conservative income figure.

The tool does not handle tax. Enter your income after tax. Percentages in Custom split must total exactly 100 and cannot be negative. The page also does not save your numbers, so note them down or take a screenshot if you want to compare months.

What to Do and What Not to Do

Do use real numbers from a recent bank statement rather than guesses. Do count minimum loan payments as needs and extra payments as savings. Do review your budget every month or two, because costs change. Do set up an automatic transfer for your savings target on payday so saving happens before spending.

Do not put wants into the needs bucket to make the numbers look better. A premium phone plan or a car that costs more than you need is partly a want. Do not give up if your first month shows red badges; that is useful information, not failure. Do not treat the 50/30/20 split as financial advice for your situation. If you are in serious debt or facing a big money decision, speak to a qualified adviser or a free debt advice service in your country.

Frequently Asked Questions