Loan & Borrowing Calculators
Thirteen calculators for every kind of borrowing — from a mortgage to a credit card balance — plus the purchase tax due in each UK nation. Each one shows the total cost, not just the monthly payment.
Which borrowing calculator do you need?
If you are comparing a fixed-rate loan of any kind, start with the Loan Calculator — it is the general case and the maths behind most of the others. If your lender quotes an EMI, the EMI Calculator is the same maths with the amortisation schedule, prepayment modelling and a downloadable plan. Buying property? The Mortgage Calculator adds deposit and loan-to-value. Buying a car with a deposit or part-exchange? Use the Auto Loan. Borrowing unsecured for a wedding, renovation or debt consolidation? The Personal Loan is set up for the shorter terms and higher rates that market uses.
Rate is not the same as cost
Two loans with the same headline rate can cost very different amounts, because fees, term length and how interest is charged all move the total. The APR Calculator folds mandatory fees back into a single annual figure so you can compare offers honestly — it is the number lenders are legally required to quote, and the only one worth comparing across products. A longer term almost always lowers the monthly payment and raises the total interest; a shorter term does the reverse.
Revolving debt behaves differently
Credit cards do not have a fixed term. Interest is charged on the balance that is left each month, so what you pay determines how long the debt lasts — and paying only the minimum can stretch a modest balance across a decade. The Credit Card Payoff shows the payoff date and total interest for any monthly payment, which is usually the fastest way to see why an extra £25 a month matters. With several balances at once the question becomes which one to attack first, and the Debt Snowball vs Avalanche runs both answers side by side.
Before you borrow, check what you can afford
Repayment maths only tells you half the story. Work out your actual monthly take-home with the Salary Calculator first, then treat the repayment as a share of that figure. If you are weighing borrowing against saving, the Compound Interest shows what the same money would do if invested instead.
Frequently asked questions
What is the difference between the loan, mortgage and car calculators?＋
The underlying maths is the same amortising-payment formula in all three. They differ in defaults and in what they show alongside the payment: mortgages assume long terms and add deposit and loan-to-value context, car loans assume short terms and part-exchange, and the general loan calculator makes no assumption at all. Use whichever one asks the questions your loan actually has.
Why is the APR different from the interest rate I was quoted?＋
The interest rate prices the borrowing alone. APR is designed to fold compulsory fees and the compounding frequency into a single annual figure so two offers can be compared like for like. A loan with a lower headline rate and a large arrangement fee can carry the higher APR, which is exactly the comparison the figure exists to expose.
Does overpaying really save that much?＋
It depends almost entirely on when you do it. Early payments land while the balance is at its largest, so they remove interest that would otherwise accrue for the whole remaining term. The same amount paid in the final years removes very little. Check your agreement for early repayment charges before committing to a schedule.
Why does credit card debt need its own calculator?＋
Because it revolves rather than amortises. There is no fixed term and no fixed payment, so the balance responds to whatever you choose to pay each month, and a minimum payment is usually recalculated as a percentage of the falling balance. That feedback loop is why minimum payments can stretch a modest balance across decades.
More finance & money tools
Every tool listed here produces an estimate from the numbers you enter and the assumptions stated on its own page. None of them accounts for fees, charges, tax treatment or your individual circumstances, and rates and thresholds change. Tool Corner is not authorised by the Financial Conduct Authority and does not give financial advice. Speak to a qualified adviser before making a financial decision.
Each tool states its own assumptions and sources. Read the full disclaimer.