Loan Calculator
Calculate monthly loan repayments, total interest, and total cost for personal loans, car finance, and more.
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How Personal Loan Repayments Work
A loan calculator works out your monthly repayments and the full lifetime cost of borrowing before you sign anything. Drop in the amount, the representative APR, and the term, and the calculator returns the monthly figure, total interest, and total repayable. Use it to compare two lender quotes side by side, or to test what shaving twelve months off the term would do to the headline payment.
UK personal loan pricing in 2025 sits in a wider band than most borrowers realise. According to Bank of England quoted household interest rate data published monthly, prime borrowers taking a £10,000 unsecured loan typically see rates in the 6% to 9% range, with the very best advertised rates dipping under 6% for short windows when high-street lenders compete on acquisition. Borrowers with thinner credit files or recent missed payments are usually quoted 12% to 25%, and anyone borrowing under £3,000 will routinely see APRs above 15% regardless of credit profile because the fixed cost of underwriting a small loan eats a bigger share of the lender's margin.
The shape of the market also matters. FCA Consumer Credit data has shown for years that the cheapest tranche of the personal loan market is the £7,500 to £15,000 band — sometimes called the "sweet spot". Lenders price aggressively here because it is the most profitable segment for them: balances large enough to spread fixed costs, small enough to keep default risk manageable, and exactly the range most car buyers and home improvers ask for. Borrow £5,000 and you may find the APR is one or two percentage points higher than at £8,000, which is why people occasionally borrow slightly more than they need to drop into a cheaper bracket — a tactic that only saves money if you do not spend the extra.
A crucial UK rule to keep in mind: under FCA conduct rules, the "representative APR" advertised by a lender only has to be offered to at least 51% of accepted applicants. The other 49% can legally be offered a higher rate after the lender has run a hard credit search. That gap between the rate on the billboard and the rate in your offer letter is the single biggest reason borrowers feel misled, and it is also the biggest reason to use soft search eligibility checkers — services like Experian, ClearScore, MoneySavingExpert's Loan Eligibility Tool, and the soft checkers built into most comparison sites — before applying anywhere. A soft search shows you an indicative rate without leaving a footprint on your credit file.
How to Calculate Your Loan Repayment Schedule
Enter the loan amount you need, the annual interest rate (the representative APR quoted by the lender), and the repayment term in years or months. Click Calculate to see your monthly payment, the total interest you will pay over the life of the loan, and the total amount repayable.
- Enter the total amount you want to borrow in pounds — be realistic about what you actually need rather than what the lender will offer.
- Input the annual interest rate (APR) from the lender's soft-search quote, not the headline representative APR from the advert.
- Set the repayment term in years or months. UK personal loan terms typically run from 1 to 7 years.
- Click Calculate to see your fixed monthly payment.
- Review the total interest figure — this is the real cost of borrowing and the number that should drive your decision.
- Adjust the term up or down by twelve months at a time and re-run the numbers to see how much shorter terms save you.
- Add any arrangement fee or admin charge to the total cost mentally — most personal loans have none, but check the agreement before signing.
The Loan Amortisation Formula Explained
The formula used: M = P[r(1+r)^n] / [(1+r)^n - 1] where P = loan amount, r = monthly rate, n = total payments
The standard UK personal loan uses a reducing-balance amortisation formula. Each monthly instalment is split into an interest portion (calculated on the outstanding balance at the start of that month) and a capital portion that pays down what you owe. Early in the term, most of your payment is interest. By the final year, almost all of it is capital.
M = P[r(1+r)^n] / [(1+r)^n - 1]
M is the fixed monthly payment, P is the loan principal, r is the monthly interest rate (annual APR divided by 12), and n is the total number of monthly payments. APR — Annual Percentage Rate — is the regulated UK headline figure and includes interest plus any compulsory fees, expressed on a reducing-balance basis. This makes APR directly comparable across lenders, which is why the FCA mandates it for advertising.
Flat rate interest works very differently and is mostly seen on older car finance agreements, some short-term loans, and a few rent-to-own products. A flat rate charges interest on the original balance for every year of the term, even though you are paying down the capital each month. A 5% flat rate on a £10,000 loan over four years charges £500 of interest every year — £2,000 in total — even though by year four you only owe a small fraction of the original. The equivalent APR on that same agreement is roughly 9.5%, almost double the headline number. If a lender quotes you a flat rate, always ask for the APR equivalent before comparing.
Loan Repayment Examples for £5,000 to £25,000 Loans
A £15,000 personal loan at 7.9% APR over 5 years: Monthly payment = £302.76. Total interest = £3,165.60. Total repayment = £18,165.60.
£5,000 personal loan at 6.9% APR over 3 years
r = 0.069/12 = 0.00575. n = 36. M = 5000 × 0.00575 × 1.00575^36 / (1.00575^36 - 1)
Monthly payment = £154.27. Total interest = £553.72. Total repayment = £5,553.72.
£10,000 personal loan at 7.5% APR over 5 years (typical UK sweet spot)
r = 0.075/12 = 0.00625. n = 60. M = 10000 × 0.00625 × 1.00625^60 / (1.00625^60 - 1)
Monthly payment = £200.38. Total interest = £2,022.80. Total repayment = £12,022.80.
£25,000 home improvement loan at 6.4% APR over 7 years
r = 0.064/12 = 0.005333. n = 84. M = 25000 × 0.005333 × 1.005333^84 / (1.005333^84 - 1)
Monthly payment = £371.95. Total interest = £6,243.80. Total repayment = £31,243.80.
£3,000 small loan at 14% APR over 2 years (small balance penalty band)
r = 0.14/12 = 0.011667. n = 24. M = 3000 × 0.011667 × 1.011667^24 / (1.011667^24 - 1)
Monthly payment = £143.99. Total interest = £455.84. Total repayment = £3,455.84.
£15,000 debt consolidation loan at 7.9% APR over 5 years vs minimum credit-card payments
Loan: r = 0.079/12, n = 60, M = £303.46, total interest ≈ £3,207. Credit card £15,000 at 22.9% APR paying minimum 2.5%: ~30 years, total interest > £20,000.
Loan total = £18,207 over 5 years. Minimum-payment card route = £35,000+ over decades. Consolidation saves roughly £17,000 if you do not run the cards back up.
When You Should Calculate Loan Costs Before Borrowing
Run the calculator before you click "apply" on any loan, even if the lender's website already shows a monthly figure. Lender quotes round to the nearest pound, sometimes hide the arrangement fee in a separate line, and almost always present the lowest-cost option (longest term) by default to make the monthly payment look manageable. By punching the same numbers into a neutral calculator, you immediately see the total interest cost the lender's checkout flow tries to keep out of focus.
Use it to stress-test affordability before committing. Take your monthly payment, add it to your existing rent or mortgage, council tax, energy, food, transport, and insurance. If the total leaves you with less than 20% of take-home pay as buffer, the loan is probably too aggressive — the FCA's affordability rules require lenders to check this, but the test they run is generic and does not know about your specific circumstances.
The calculator is also the right tool for comparing dissimilar credit options. A £4,000 sofa on a 0% purchase credit card with a 24-month interest-free window has a very different cash-flow profile to the same £4,000 on a 4-year personal loan at 9%. Modelling both lets you see whether the discipline of fixed loan payments is worth the extra interest, or whether the flexibility (and risk) of the credit card route suits you better.
Finally, use it before any debt consolidation decision. Consolidating £15,000 of credit-card balances into a 5-year personal loan at 7.9% APR can save roughly £17,000 in interest compared with making minimum payments on the cards — but only if you cut up the cards or freeze them. Without that discipline, a third of borrowers run the card balances back up within 18 months, ending up with both the loan and the card debt.
Loan Terms and Definitions
Personal Loan vs Credit Card vs Overdraft: Cost Comparison
| Feature | Personal Loan | 0% Credit Card | Authorised Overdraft |
|---|---|---|---|
| Typical APR / EAR (2025) | 6%-9% prime, 15%+ for £1k-£3k | 0% intro 18-24 months, then 22%-29.9% APR | ~40% EAR (post-2020 FCA rules harmonised pricing) |
| Borrowing range | £1,000-£50,000 | £500-£15,000 credit limit | £250-£3,000 typical |
| Repayment structure | Fixed monthly payment for full term | Minimum 1-3% of balance, or any amount up to full | No fixed schedule — interest charged daily on overdrawn balance |
| Set-up cost | Usually no fee | 2%-3% balance transfer fee on transferred debt; 0% on new spend | None if pre-arranged |
| Best use case | Planned purchase £3k-£25k or debt consolidation | Short-term spend repayable within the 0% window | Genuine short-term cashflow gap (days to weeks) |
| Risk if not managed | Default after missed payments — lower than revolving credit | Revert rate kicks in at end of intro — easy to drift into 25%+ debt | Most expensive credit on the market by EAR; highly punishing if persistent |
| Credit score impact | Single hard search; positive once paid down | Single hard search; high utilisation hurts score | No new search if already arranged |
Tips to Reduce Your Total Loan Cost
- Aim to borrow in the £7,500 to £15,000 band — FCA Consumer Credit data consistently shows this is the cheapest tranche of the UK market because lenders compete hardest here.
- Always run a soft search through Experian, ClearScore, MoneySavingExpert's eligibility tool, or your bank's app before formally applying — multiple soft searches cost nothing but a single hard search can drop your score by 5-30 points.
- Check your credit file at all three agencies (Experian, Equifax, TransUnion) and dispute any errors before applying. Fixing one mis-recorded missed payment can move you into a cheaper rate band.
- Stay with your current account provider for the cheapest rate if you have a long banking relationship — existing customer pricing is often 1-2% lower than headline rates for new applicants.
- Look at credit unions for smaller balances — they are capped at 42.6% APR by law and often beat banks on £1,000-£3,000 loans, especially if you are not a prime borrower.
- Pick the shortest term you can comfortably afford. A £10,000 loan at 7.5% APR over 3 years costs about £1,200 in interest; the same loan over 7 years costs nearly £2,900.
- Avoid taking out multiple applications in the same month. A flurry of hard searches signals desperation to lenders and pushes your offered rate up.
- Consider whether overpayments are penalty-free before signing. The Consumer Credit Act caps ERCs but lenders interpret the rules differently — some allow unlimited overpayments, some claw back two months' interest on full early settlement.
Loan Comparison Mistakes Borrowers Make
- Treating the representative APR as the rate you will get. Only 51% of accepted applicants are entitled to it — the rest are quoted higher after the hard search lands on their file.
- Stretching the term to drop the monthly payment without checking the total interest. Going from 3 years to 7 years on a £10,000 loan typically more than doubles the lifetime interest paid.
- Applying to four or five lenders in one weekend. Each application triggers a hard search and the cluster signals risk to underwriters, making subsequent quotes worse.
- Ignoring eligibility checkers because they "don't show real rates". Soft-search tools predict acceptance with reasonable accuracy and protect your credit file while you compare — there is no upside to skipping them.
- Borrowing on an unauthorised overdraft instead of a planned loan. Post-2020 FCA rules harmonised most overdraft pricing at around 40% EAR — vastly more expensive than even a poor-credit personal loan.
- Paying for optional payment protection insurance bundled into the monthly figure without checking whether existing income protection or critical illness cover already provides the same protection.
- Falling for flat-rate marketing. A 5% flat rate on a 4-year loan is roughly equivalent to 9.5% APR — almost double. Always ask for the APR equivalent before comparing.
- Consolidating credit card debt into a personal loan and then running the cards back up within 18 months. Roughly a third of consolidators do this, ending up with both the loan and the original revolving balance.
Loan Calculator: Common Questions Answered
What is APR and why does it matter more than the interest rate?
APR (Annual Percentage Rate) is the total yearly cost of borrowing including interest and any compulsory fees, calculated on a reducing balance. The FCA mandates APR for advertising so you can compare loans like for like. A loan with a low headline interest rate but high arrangement fees can have a higher APR than one with a slightly higher rate and no fees.
Will I actually get the representative APR I see advertised?
Not necessarily. UK rules only require lenders to offer the representative APR to at least 51% of accepted applicants. The other 49% are legally allowed to be quoted a higher personal APR. Use a soft-search eligibility checker first to see your likely real rate without affecting your credit file.
How much can I borrow with a UK personal loan?
Most mainstream UK personal loans range from £1,000 to £25,000, with some lenders going up to £50,000 for established customers. According to FCA Consumer Credit data, the cheapest rates are typically in the £7,500 to £15,000 range. Smaller balances (£1,000-£3,000) usually attract APRs above 15% because fixed underwriting costs eat a bigger share of the lender's margin.
Does paying off a loan early save money?
Yes, because you stop accruing interest on the outstanding balance. Under the Consumer Credit Act 1974, lenders can charge an Early Repayment Charge of up to 1 month's interest on partial settlement and up to 2 months' interest on full settlement (different rules apply for loans under £8,000). Even after the ERC, settling early almost always saves money on a multi-year loan.
What is the difference between a soft search and a hard search?
A soft search is a credit check that does not leave a footprint on your file — eligibility checkers from Experian, ClearScore, MoneySavingExpert, and most comparison sites use them. A hard search is recorded and visible to other lenders for 12 months. Multiple hard searches in a short period can lower your credit score and push your offered rate up.
Can I get a personal loan with bad credit?
Yes, but at higher rates — often 20%-50% APR for poor credit, sometimes higher. Credit unions are capped at 42.6% APR by law and are often more competitive than mainstream banks for borrowers with thin files or recent missed payments. Avoid payday or short-term high-cost lenders where possible — APRs can exceed 1,000%.
How long does a default or CCJ stay on my credit file?
Both defaults and County Court Judgments (CCJs) stay on your credit file for 6 years from the date they were registered, even after you have settled the debt. During that time, mainstream personal loan access is heavily restricted, though some specialist lenders will still consider you at higher rates.
Is a personal loan or a 0% credit card cheaper?
It depends on the amount, the term, and your discipline. A 0% purchase or balance transfer credit card with an 18-24 month interest-free period (and a 2-3% transfer fee) usually beats a personal loan if you can clear the balance before the intro period ends. If you need more than 24 months or want the discipline of a fixed monthly payment, a personal loan is normally cheaper overall.
Why are smaller loans more expensive than mid-size ones?
FCA Consumer Credit data consistently shows that loans under about £5,000 carry higher APRs than loans in the £7,500-£15,000 range. The reason is fixed underwriting and admin costs — running a credit check, processing the agreement, and servicing a loan costs the lender roughly the same whether it is £2,000 or £12,000, so the smaller balance has to carry a higher rate to cover those costs.
What is a flat rate and why should I avoid it?
A flat rate calculates interest on the original loan amount for every year of the term, even though you are paying the capital down each month. A 5% flat rate over 4 years is roughly equivalent to 9.5% APR. Most modern UK personal loans use APR, but flat rates still appear on some older car finance, rent-to-own, and short-term agreements. Always ask for the APR equivalent before comparing.
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