UK Personal Loan Repayment Calculator
Whether you're borrowing for a car, home improvements, or debt consolidation, knowing exactly what you'll pay each month — and in total — is essential before signing any loan agreement.
Many borrowers focus only on the monthly payment without considering the total cost. A £10,000 loan at 6.5% over 3 years costs about £1,700 in interest, but stretching the same loan to 7 years pushes total interest above £4,600. The monthly payment drops, but you pay almost three times more for the privilege of lower instalments.
Another common mistake is comparing advertised "representative APRs" as though they're guaranteed. In the UK, lenders only have to offer the advertised rate to 51% of successful applicants — you could be offered significantly more. Always get a personalised quote (using a soft credit check) before committing, and use this calculator to see exactly what your actual rate would cost.
Enter your loan amount, interest rate, and term below to see your monthly payment, total interest, and a full year-by-year breakdown showing how your balance reduces over time.
Loan Repayment Calculator
What this monthly payment really commits you to
The headline monthly payment is the easy bit — the total interest figure is where decisions are made. Stretching a £15,000 loan from 3 to 5 years can drop the monthly payment by £150 but adds £1,500–£2,500 in interest over the term. As a rule of thumb, pick the shortest term you can comfortably afford.
Watch for the difference between representative APR and the rate you're actually offered — only 51% of borrowers get the headline figure, so your real rate may be 2–5% higher. Most personal loans also allow penalty-free overpayments; even one extra month per year shaves serious interest off a 5-year loan.
How Personal Loans Work in the UK
A personal loan is an unsecured loan from a bank, building society, or online lender. You borrow a fixed amount and repay it in equal monthly instalments over an agreed term — typically 1 to 7 years. Because the loan is unsecured, the lender can't repossess an asset if you default, but it will damage your credit score.
Most UK personal loans charge a fixed interest rate, meaning your monthly payment stays the same throughout. This makes budgeting straightforward. However, the split between interest and principal changes each month — early payments are heavily weighted towards interest, which is why overpaying early saves the most money.
Lenders are required to show a representative APR, but this only has to be offered to 51% of successful applicants. The rate you're actually offered depends on your credit score, income, existing debts, and the loan amount. Borrowing between £7,500 and £15,000 often attracts the best rates — oddly, borrowing more can sometimes be cheaper per pound than borrowing less.
Shorter = Cheaper
Choose the shortest term you can afford. You'll pay significantly less interest overall, even though monthly payments are higher.
Check Your Rate First
Use eligibility checkers (soft credit search) before applying. This shows your likely rate without affecting your credit score.
Avoid PPI Add-Ons
Payment protection insurance is rarely good value when sold alongside a loan. If you want income protection, buy it separately and compare quotes.
Alternatives to Personal Loans
Before taking out a loan, consider whether other options might be cheaper. A 0% purchase credit card can be interest-free for up to 24 months if you can repay within the promotional period. For home improvements, a further advance on your mortgage may offer a lower rate — though you'll pay interest over a much longer period.
If you have savings, it almost always makes sense to use them rather than borrow. Even the best savings accounts rarely earn more than 5%, while personal loan rates start at 3% and go much higher. Use our Compound Interest Calculator to compare the cost of using savings versus keeping them invested.
If you're consolidating existing debts, make sure the total cost of a new loan is genuinely less than your current repayments. Factor in any early settlement fees on existing credit. Our Budget Planner can help you see whether you can afford repayments comfortably alongside your essential outgoings.
Frequently Asked Questions
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