Calculators
Seven free tools for UK personal loans and debt payoff. Pick a calculator below to open it; how to choose, what each tool leaves out and a worked £ EXAMPLE follow underneath. Illustrative only; not a lender and not a credit offer.
Last checked
The seven calculators
Personal loan EMI calculator UK – monthly repayments
Your monthly repayment, total interest and total to repay. EXAMPLE: £5,000 at 10% over 24 months = £230.72/month.
Monthly repayment, total interest and total to repay. EXAMPLE: £5,000 at 10% over 24 months = £230.72 a month.
Amortisation schedule calculator
Month-by-month principal and interest schedule for a personal loan.
The interest and principal split for every month, with a CSV download.
Debt consolidation break-even calculator
Compare keeping several debts versus one consolidation loan after fees.
Keep your current debts or roll them into one loan — lifetime cost after fees, not just the new instalment.
Snowball vs avalanche payoff planner
Smallest-balance-first vs highest-rate-first payoff — months and interest side by side.
Smallest balance first versus highest rate first, on the same debts and budget.
Personal loan refinance calculator UK – break-even after fees
Break-even months for refinancing a personal loan given fees, rate and term.
Replace one personal loan with another: monthly saving, fee payback month and lifetime saving.
Loan APR calculator UK – true cost including arrangement fees
See how upfront fees raise effective borrowing cost versus the headline rate.
How an upfront fee raises the effective rate above the headline rate.
Loan overpayment calculator UK – interest and months saved
Model regular extras or a lump sum — interest saved and months cut from the term.
Months cut and interest saved by a regular overpayment or a lump sum.
About these calculators
LoanCalc Lab’s calculators are for UK personal loans and multi-debt payoff planning in sterling. They size payments, schedules and break-even under labelled EXAMPLE assumptions — so you can see the maths before you open a lender illustration. They are not a credit offer, not affordability advice, and not about mortgages or remortgage products.
Every tool states its inputs and formula assumptions on the page. Shared EXAMPLE figures (Loan A, Loan B, and the three-debt set) are labelled EXAMPLE so they are never mistaken for a live quote. Country mode may change currency symbols and payment labels; it does not rewrite UK product rules — see country mode help.
Who these tools are for
Use this hub if you are comparing a personal-loan illustration, checking whether fees erase a lower rate, planning how to clear several consumer debts, or reading how early overpayments change months and interest. Pair each tool with its matching guide when you want the how-and-why in prose — guides explain; calculators compute.
Do not use these pages as a substitute for MoneyHelper, free debt advice, or the lender’s pre-contract disclosure. If repayments already feel unmanageable, stop and seek regulated help rather than chasing a lower EXAMPLE monthly figure.
Which calculator do I need?
Start from the question you are actually asking. Each line below names the tool that answers it and why. If two lines fit, use the first tool to get the numbers and the second to test a change.
- “I have a quote and want to know the monthly payment.” → Personal loan / EMI. Turns amount, rate and term into a fixed monthly payment, total interest and total repayable.
- “Why has my balance barely moved after a year?” → Amortisation schedule. Shows each month’s split between interest and principal, so you can see where the money went.
- “Two offers: one has a lower rate, the other has no fee.” → APR / true cost. Measures the rate on the cash you actually receive, so a fee and a rate can be compared on one number.
- “I have spare money each month or a one-off sum.” → Extra payment. Shows how many months and how much interest an overpayment could save, assuming the lender shortens the term.
- “I have several cards and loans and want to clear them in the right order.” → Snowball vs avalanche. Runs both payoff orders on the same debts and the same budget, so the trade-off is visible in months and pounds.
- “I’ve been offered one loan to clear all my debts.” → Consolidation break-even. Compares keeping your current payments with the new loan, after fees, and shows when any fee is recovered.
- “Could I move my existing loan to a cheaper one?” → Refinance break-even. Compares the rest of your current loan with a replacement over its full term, including fees.
If none of these fit — for example you are behind on payments, or you are being asked to choose between rent and a loan repayment — a calculator is the wrong first step. Free, confidential help is listed on MoneyHelper’s debt advice locator.
The seven tools at a glance
What each tool answers, what you need to type in, and — just as important — what it leaves out. Anything in the last column has to be checked with the lender.
| Tool | Answers | Key inputs | Ignores |
|---|---|---|---|
| Personal loan / EMI | Monthly payment, total interest, total repayable | Amount, rate, term, optional fee | Daily interest, payment holidays, rate changes |
| Amortisation | Interest and principal in every month; balance over time | Amount, rate, term | Settlement rebates and compensation |
| APR / true cost | Effective rate on the cash you receive after a fee | Amount, headline rate, term, upfront fee | Statutory APR compounding; fees added to the balance |
| Extra payment | Months and interest saved by overpaying | Amount, rate, term, monthly extra, lump sum | Early repayment compensation; how your lender applies extras |
| Snowball vs avalanche | Payoff order, months and interest for each strategy | Each debt’s balance, rate and minimum; spare money per month | Falling card minimums, promotional rates ending, new spending |
| Consolidation break-even | Whether one new loan beats current payments, after fees | Current debts and payments; new loan amount, rate, term, fee | Secured-loan risk; reusing cleared cards |
| Refinance break-even | Monthly saving, fee payback month, lifetime saving | Balance, current rate and months left; new rate, term, fees | Settlement figure differences; credit-score effects |
All seven tools assume a fixed rate, monthly payments made on time, and interest worked out as annual rate ÷ 12. The methodology section on each tool page sets out the steps exactly.
Before you trust any loan calculator
Every online loan calculator, including these, simplifies the real agreement. Four UK points catch people out most often.
- Fees change the real cost. An arrangement fee taken from the advance means less money in your account for the same repayments. A fee added to the balance means paying interest on the fee. Either way, compare the total amount payable as well as the monthly figure — MoneyHelper’s personal loans guide makes the same point.
- The APR is not the interest rate. The APR includes compulsory fees and is worked out under the FCA’s APR rules (CONC App 1). An advert’s representative APR only has to be offered to at least 51% of successful applicants, so the rate in your own quote is the one to enter.
- Paying off early is a legal right, not always a free one. Under the Consumer Credit Act 1974, section 94, you can repay a regulated loan early, and the Early Settlement Regulations 2004 set how the interest rebate is worked out. A fixed-rate lender may charge capped compensation. A calculator balance is never a settlement figure; the lender’s written figure is.
- Applying leaves a mark; checking need not. Eligibility checkers normally use a soft search that other lenders cannot see, while a full application records a hard search. Several hard searches close together can make the next lender more cautious — see MoneyHelper on credit scores and searches. Running a calculator never touches your credit file.
Lenders offering consumer credit in the UK must be authorised by the FCA. If a “lender” asks for an upfront fee before paying out, check the FCA warning list first.
Worked journey: two offers, then an overpayment plan
This EXAMPLE uses two tools in sequence. All figures come from running the calculators with the inputs shown; they are illustrations, not quotes.
Step 1 — compare the offers on APR / true cost. A borrower needs £7,500 over 36 months. Offer one is 9.9% with no fee: £241.65 a month, £8,699.47 repaid, and an effective rate of 9.90% because the full £7,500 arrives. Offer two is 8.9% with a £250 fee taken from the advance: £238.15 a month and £8,573.37 in repayments, but only £7,250 arrives — an effective rate of about 11.23%. The lower headline rate saves £3.50 a month yet costs more per pound received, and the borrower would be £250 short of what they need.
Step 2 — test an overpayment on the chosen loan. Taking offer one into the extra payment calculator, an extra £50 a month (£291.65 in total) clears the loan in 30 months instead of 36 and saves about £235 in interest. An extra £75 a month clears it in 27 months and saves about £320. Both are far below the £8,000-a-year level at which a fixed-rate lender may charge compensation, but the borrower should still confirm in writing that overpayments shorten the term.
The order matters: compare the true cost first, then plan repayments on the loan you would actually take. Doing it the other way round can make a dearer loan look attractive.
Guides, glossary and caution
For the how-and-why behind each tool, start at the guides hub. Recent comparison frames: personal loan vs credit card, secured vs unsecured, and soft search vs hard search. Plain-language definitions live in the glossary. For general UK credit information see MoneyHelper — credit and debt and FCA — consumer credit. LoanCalc Lab is published by Rodway Labs; it is not a lender, broker or advice firm. Last checked 24 October 2026.