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DebtAPR (Annual Percentage Rate) is the standardised measure of borrowing cost. It bundles interest and compulsory fees into one annualised number so you can compare loans fairly. This calculator derives APR from loan amount, monthly payment and term — the way the FCA defines it.
Runs entirely in your browser — your numbers are never sent to a server.
The headline interest rate (nominal) is the pure cost of money. APR adds compulsory fees and expresses the whole package as an annualised figure. UK lenders must quote representative APR — the rate at least 51% of successful applicants get.
APR excludes: optional insurance, late fees, early repayment charges, and third-party fees (e.g., solicitor on a mortgage).
Lower APR always = cheaper borrowing when term is the same. But a 60-month 7% loan can total more interest than a 36-month 9% loan despite the lower APR. Always check both APR AND total repayable.
The APR offered to at least 51% of successful applicants. Your personal APR may be higher based on credit score.
0% purchase or balance transfer cards offer a limited window with no interest. Fees (balance transfer fee ~3%) still count towards your overall cost.
UK lenders assess based on your credit profile. The displayed representative APR is only guaranteed for the top-tier applicants.
Illustrative calculation. Not personalised financial advice. Rates, bands and allowances for the 2026/27 UK tax year, verified against gov.uk at time of review. For regulated advice consult an FCA-authorised adviser.