Personal Loan Calculator — Payment & Cost

Personal Loan Guide

How Loan Payments Are Calculated?

Monthly payment = P × r(1+r)ⁿ / ((1+r)ⁿ−1). Where P = loan amount, r = monthly interest rate (APR ÷ 12 ÷ 100), n = total months. A £10,000 loan at 6.9% APR over 3 years: r = 0.069/12 = 0.00575 per month. n = 36 months. Monthly payment = £308.82. Total repaid = £308.82 × 36 = £11,117. Interest = £1,117 (11.2% of loan). Early in the loan, most of each payment is interest. Later, more goes to principal — this is the amortisation schedule.

What do I need to know about APR and True Loan Cost?

APR (Annual Percentage Rate) includes the interest rate plus all mandatory fees — it is the legally required comparison figure for UK loans. Always compare APRs, not just headline rates. Representative APR: lenders must offer the advertised rate to at least 51% of accepted applicants — you may be offered a higher rate based on your credit score. The best personal loan APRs in 2024: 5.5-7.5% for good credit borrowers. Credit card rates: 20-30%+ APR for purchases, higher for cash. Payday loans: effectively costing 300-1,500%+ APR once fees are included, which is why they should only ever be considered as a genuine last resort.

What's the difference between Secured and Unsecured Loans?

Unsecured personal loans: no collateral required. Higher rates than secured. Used for: car purchase, home improvement, debt consolidation, major purchases. Secured loans (against property): lower rates (typically 5-10% for good credit, since lender risk is reduced). Risk: if you default, your home can be repossessed. Used for: large amounts, long terms, those with poor credit who can offer security. Credit cards (Section 75 protection): for purchases between £100 and £30,000, credit cards offer joint and several liability with the retailer, giving you a route to a refund even if the retailer goes bust.

Should You Take a Loan?

Before borrowing, consider alternatives: savings — using savings avoids interest entirely and is always cheaper unless savings interest exceeds loan cost (rare). 0% purchase credit card — often the cheapest way to borrow for purchases if cleared within the promotional period. Interest-free employer/credit union loans — check if available. Loan purpose matters: borrowing to buy a depreciating asset (car, consumer goods) adds permanent cost. Borrowing to buy an appreciating asset or for education and training that increases future earning potential is generally considered a more justifiable use of debt, since the asset or benefit gained can outlast the cost of borrowing.

APR vs. Interest Rate: Why the Number on the Advert Isn't the Whole Story

A personal loan's advertised interest rate and its APR (Annual Percentage Rate) are often different figures, and the APR is the one that matters for comparing offers fairly. The interest rate reflects only the cost of borrowing the principal, while APR folds in mandatory fees — arrangement fees, broker fees in some markets — spread across the loan term into a single annualized percentage, giving a true like-for-like cost of credit. Lenders are generally required to advertise a "representative APR," which is the rate at least a majority of successful applicants will actually receive; borrowers with weaker credit profiles are commonly offered a higher rate than the one advertised, so the APR you're quoted after applying may differ meaningfully from the headline figure used in advertising.

Does Paying Off a Personal Loan Early Actually Save Money?

Most personal loans use a repayment structure where each monthly payment covers that month's accrued interest first, with the remainder reducing the principal — meaning interest is charged on a shrinking balance over time. Paying extra or clearing the loan early generally reduces the total interest paid, since you stop accruing interest on the balance sooner, but some loans carry an early repayment charge (often capped by regulation at a modest number of months' worth of interest) that can offset some of that saving. Before committing extra funds to early repayment, it's worth comparing the loan's interest rate to what that money could earn elsewhere — if the loan rate is low relative to likely investment returns, paying the minimum and investing the surplus can sometimes come out ahead, though guaranteed debt reduction carries no market risk.

How Your Credit Score Changes the Rate You're Actually Offered

The headline rate advertised by a lender is rarely the rate every applicant receives, because personal loan pricing is typically risk-based, meaning the interest rate offered depends heavily on the applicant's credit score, existing debt levels, and income stability. Lenders are required to show a "representative APR," which only needs to be offered to a majority, often 51%, of successful applicants, so a meaningful proportion of borrowers, generally those with weaker credit profiles, are legally offered a higher rate than the one advertised. This is why running a loan comparison using only the representative APR can be misleading for anyone with credit issues, missed payments, or a short credit history, since their actual offered rate could be noticeably higher once a lender assesses their individual application. Many lenders now offer a soft-search quote that shows the likely personalised rate without affecting the credit score, which is generally a more reliable way to estimate true borrowing cost than relying on the advertised headline figure. Improving a credit score before applying, by paying down existing balances or correcting errors on a credit report, can sometimes shift an applicant into a better pricing tier and materially reduce the real rate offered.

Typical APR Ranges by Loan Amount and Credit Profile

Personal loan APRs vary substantially by loan size as well as by credit score, because lenders price in both default risk and the fixed cost of originating and servicing a loan — a cost that's proportionally larger on a small loan.

Lenders in the UK are required to advertise a "representative APR" that at least 51% of successful applicants actually receive, but that still leaves up to 49% being offered a worse rate — so the advertised headline figure is a guide, not a guarantee, and the only way to know your actual rate is to go through a soft-search eligibility check that doesn't affect your credit file before making a full application.

Worked Example: Total Interest on a £10,000 Loan Over Different Terms

Borrowing £10,000 at a typical APR of 8.5%, the total interest paid varies substantially depending on the repayment term chosen — a shorter term means higher monthly payments but dramatically less interest overall. Over 2 years (24 months), the monthly payment is roughly £454, and total repayment is about £10,896 — £896 in interest. Over 4 years (48 months), the monthly payment drops to roughly £247, but total repayment rises to about £11,856 — £1,856 in interest, more than double. Over 6 years (72 months, if the lender offers that term), the monthly payment falls further to roughly £176, but total repayment climbs to about £12,672 — £2,672 in interest, triple the 2-year cost. The pattern holds generally: stretching a loan out roughly doubles or triples total interest paid even though the monthly payment looks far more manageable, because interest keeps accruing on a balance that takes longer to pay down. The right trade-off depends on whether the lower monthly payment is genuinely needed for affordability, or whether it's worth stretching the budget to take the shorter term and save over £1,500 in this example alone — money that, once committed to interest, can't be recovered even by paying extra later unless the loan specifically allows penalty-free overpayments.

Fixed vs Variable Rate Personal Loans

Most unsecured personal loans in the UK are offered at a fixed rate for the full term, meaning the monthly payment and total interest are locked in from day one regardless of what happens to broader interest rates afterward. This is different from a mortgage, where fixed-rate deals typically only last 2-5 years before reverting to a variable rate. The practical benefit of a fixed-rate personal loan is budgeting certainty — the monthly payment calculated at the outset is exactly what you'll pay every month until the loan is cleared, with no risk of a rate rise increasing the payment partway through, which matters more for personal loans than it might seem given they're often taken out for unavoidable costs (a car, home repairs, debt consolidation) rather than discretionary spending where some flexibility might be acceptable.