Loan & Borrowing Calculators
Seven calculators for every kind of borrowing — from a mortgage to a credit card balance. Each one shows the total interest, 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. 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.
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.