Personal Loan Calculator UK: Monthly Payments, Total Interest, and What It Really Costs

Your Monthly Payment Depends on Three Numbers - and One That Surprises Most Borrowers

The monthly repayment on any personal loan comes down to how much you borrow, the interest rate (APR), and the term. The number that catches most people out is the total interest paid over the life of the loan. A £10,000 loan at 6.9% APR over 5 years looks affordable at £197 per month. The total repayment is £11,820. That £1,820 in interest is money out of your pocket for the privilege of having the £10,000 now instead of saving for it. The free Loan Calculator on ToolsForTasks shows you the monthly payment, total interest, and full repayment schedule before you commit to anything. Run the numbers first. Borrow with your eyes open.

At a Glance

• Monthly payment formula: M = P x [r(1+r)^n] / [(1+r)^n - 1]

• A £10,000 loan at 6.9% APR over 5 years: £197/month, £11,820 total

• APR includes fees; the interest rate alone doesn't tell the full cost

• Shorter terms mean higher monthly payments but less total interest paid

• Use the Loan Calculator to compare term lengths side by side before you apply

The Loan Repayment Formula

Monthly repayment = P x [r(1+r)^n] / [(1+r)^n - 1]

Where:

• P = the loan principal (amount borrowed)

• r = the monthly interest rate (annual APR divided by 12, as a decimal)

• n = the total number of monthly payments (years x 12)

For a £10,000 loan at 6.9% APR over 5 years:

• P = 10,000

• r = 0.069 / 12 = 0.00575

• n = 60 (5 years x 12 months)

• Monthly payment = £197.10

• Total repaid: £11,826

Most people skip this and just look at the monthly amount. The Loan Calculator does the full sum instantly, showing the total interest clearly.

APR vs Interest Rate: What You're Actually Paying

APR (Annual Percentage Rate) is the rate you should compare. It includes the annual interest rate plus any compulsory fees charged by the lender. Two loans can have the same headline interest rate but different APRs if one charges an arrangement fee.

The interest rate is just the cost of borrowing the money itself, without fees. It's always lower than the APR.

UK lenders must quote APR in advertising. When you compare personal loans, always compare APR to APR.

Representative APR vs your APR. Lenders quote a "representative APR" in adverts. This is the rate offered to at least 51% of successful applicants. Your actual APR depends on your credit score, income, and the loan amount. If your credit score is below average, expect to be offered a higher rate than the representative.

How Loan Term Affects Total Cost

Longer terms lower your monthly payment but increase total interest. Example: £15,000 borrowed at 7% APR.

The difference between a 2-year and 7-year term on the same £15,000 loan is £2,964 in extra interest. That's nearly 20% of the original loan amount for the flexibility of paying less each month.

A Real Example: Buying a Car

A 34-year-old project manager in Manchester wanted to borrow £12,000 to buy a second-hand car in February 2026. She had two options.

Option A: Dealer finance at 9.9% APR over 4 years. Monthly payment: £302. Total interest: £2,496.

Option B: A personal loan from her bank at 6.5% APR over 3 years. Monthly payment: £368. Total interest: £1,248.

Option B cost £66 more per month but saved £1,248 in total interest. She ran both through the Loan Calculator before signing anything. She chose the bank loan and used the interest saving to build a small emergency fund. The higher monthly payment was tight but manageable on her salary.

Secured vs Unsecured Loans

Unsecured personal loans (what most people mean by "a loan") require no asset as collateral. If you stop paying, the lender pursues you for the debt but cannot automatically repossess your home. Interest rates reflect the higher risk: 5-20% APR is typical.

Secured loans use an asset - usually your home - as collateral. Lower rates (3-8%) but if you miss payments the lender can apply to repossess. Only worth considering if you own property and need a large amount over a long term.

For amounts under £25,000 over terms up to 7 years, an unsecured personal loan is nearly always the right structure.

Early Repayment

Most UK personal loans allow early repayment, but many lenders charge an early repayment charge (ERC) of up to 1-2 months' interest. If you think you might repay early:

• Check the terms before accepting

• Some lenders (including several digital banks) charge no ERC at all

• The saving from paying off early can still outweigh the ERC on large loans

How to Use the Loan Calculator

1. Open the free Loan Calculator on ToolsForTasks

2. Enter the loan amount

3. Enter the APR (from the lender's quote or a comparison site)

4. Set the term in years

5. Read the monthly payment, total repaid, and total interest

Try multiple term lengths to find the point where the monthly payment is manageable and the total interest is acceptable. The Loan Calculator makes this comparison instant.

What Lenders Look at When You Apply

Credit score is the biggest factor, but not the only one. UK lenders also check:

• Income and employment status (permanent employment is preferred)

• Existing debt-to-income ratio (other loans, credit cards, mortgage)

• Electoral roll registration (being on it helps your credit file)

• Account history length with the lender

• Recent credit applications (multiple applications in a short window hurt your score)

A soft search (eligibility check) won't affect your credit score. A hard search (a full application) will leave a mark. Use lenders that offer soft searches first before committing to a full application.

Comparison: 3-Year vs 5-Year Loan at Various Amounts (7% APR)

Frequently Asked Questions

How do I calculate monthly loan repayments?

Use the formula M = P x [r(1+r)^n] / [(1+r)^n - 1], where P is the loan amount, r is the monthly interest rate (APR / 12 / 100), and n is the number of months. Or use the Loan Calculator, which handles it instantly and shows the total interest too.

What is a good APR for a personal loan in the UK?

In 2026, rates below 7% are competitive for loans of £7,500 or above. Rates of 5-6% are excellent and typically go to borrowers with strong credit scores. Rates above 15% suggest either a smaller loan amount, a short credit history, or credit issues worth addressing before borrowing.

Can I pay off a personal loan early?

Yes. Most UK lenders allow early repayment. Some charge an early repayment fee of up to 1-2 months' interest. Check the terms before you sign. For loans with no ERC, overpaying each month reduces the term and total interest without penalty.

Does applying for a loan affect my credit score?

A soft eligibility check doesn't. A full application (hard search) leaves a mark on your credit file for 12 months and can lower your score slightly, especially if you make multiple applications in a short time. Use comparison sites that run soft checks first.

How much can I borrow on a personal loan in the UK?

Most UK lenders offer personal loans between £1,000 and £25,000. Some specialist lenders go to £50,000. The amount you can borrow depends on your income, existing debts, and credit history. A rough rule: lenders typically won't approve monthly payments that exceed 25-30% of your take-home pay.

Is a personal loan better than a credit card?

For planned, larger purchases (£1,000+) where you know the exact amount, a personal loan with a fixed term and rate usually costs less than a credit card. Credit cards are better for smaller, flexible spending and offer stronger consumer protections under Section 75 of the Consumer Credit Act.

What happens if I miss a loan payment?

You'll be charged a late-payment fee (typically £20-£25). The missed payment is reported to credit agencies after a grace period. Repeated missed payments can lead to a default notice and serious credit file damage. If you're struggling, contact the lender before missing a payment - most have hardship arrangements available.

Final Thoughts

The monthly payment is the number everyone focuses on. The total interest is the number that actually matters for your long-term finances. Run any loan offer through the Loan Calculator before you sign, compare it against a shorter term, and check whether your budget can absorb the difference.

If you're borrowing to buy a home, the Mortgage Calculator and Stamp Duty Calculator cover the full picture. For working out your finances before taking on debt, the Compound Interest Calculator shows what you'd have if you saved instead. Browse the free directory of financial tools for everything from VAT to freelance rates.