Plan your monthly budget, track income vs expenses, and calculate your savings rate instantly.
The Budget Calculator is a free online personal finance tool that helps you track income, categorise expenses, and calculate your monthly savings rate. Budgeting is the foundation of financial health — research consistently shows that people who budget save significantly more than those who don't. Whether you're trying to pay off debt, build an emergency fund, or save for a major purchase, this calculator gives you a clear picture of where your money is going and how much you can save each month.
Enter your monthly take-home income (after tax) in the Income section.
Add each expense category — housing, food, transport, utilities, subscriptions, and any other regular outgoings.
Click 'Add Expense' to include additional categories specific to your lifestyle.
The calculator automatically totals your expenses and calculates your monthly surplus or deficit.
Review the breakdown to identify which categories consume the largest share of your income.
Use the results to set spending targets and track progress month over month.
The 50/30/20 rule divides after-tax income into three categories: 50% for needs (housing, food, utilities, transport), 30% for wants (dining out, entertainment, hobbies), and 20% for savings and debt repayment. This framework is popular because it is simple and flexible. Unlike zero-based budgeting, which assigns every dollar a job, the 50/30/20 rule gives you freedom within guardrails. If your housing costs 35% of income, you have less room for wants — but the rule adapts to your circumstances.
For most people starting their budgeting journey, the 50/30/20 rule is the best entry point. Once you have a clear picture of your spending, you can refine it with more granular category tracking. The key insight is that budgeting is not about restriction — it is about intentionality. Every pound or dollar you spend is a choice, and a budget makes those choices conscious rather than accidental.
An emergency fund is the single most important financial buffer you can build. Without one, any unexpected expense — car repair, medical bill, job loss — forces you into debt. Financial experts recommend keeping 3–6 months of essential expenses in a liquid, easily accessible account (not invested).
The fastest way to build an emergency fund is to treat it as a non-negotiable expense in your budget. Automate a transfer to a separate savings account on payday before you have a chance to spend it. Start with a target of £1,000 or $1,000 as your first milestone — this covers most common emergencies and provides immediate psychological security.
Once your emergency fund is fully funded, redirect those automated savings towards your next financial goal: paying off high-interest debt, investing for retirement, or saving for a specific purchase. The budget calculator helps you model these scenarios by adjusting your expense and savings allocations.
Monthly budgets are more actionable than annual ones. Expenses vary month to month (holiday gifts, car insurance, etc.), so review and adjust your budget at the start of each month.
Set up automatic transfers to your savings account on payday. Paying yourself first removes the temptation to spend savings and makes the habit effortless.
A budget is only useful if you compare it to reality. Review your actual spending weekly and adjust categories that consistently go over budget.
Subscription services are the easiest expenses to reduce. Audit all recurring charges monthly — the average household has 12 active subscriptions and is unaware of 3–4 of them.
Zero-based budgeting assigns every unit of income to a category, including savings. This prevents lifestyle creep where unallocated money gets spent on impulse purchases.
For categories where you tend to overspend (dining, entertainment), withdraw cash at the start of the month. When the cash is gone, spending stops — a physical constraint that digital payments lack.