Decision one
What changes the result most?
Apr, term length and any overpayments you can maintain without missing other priorities. That is usually where the decision is won or lost.
Loan planning
Personal loan repayment calculator
Use this personal loan calculator to see the monthly repayment, total interest and full borrowing cost before you agree to anything. It also shows how the outcome changes if you shorten the term or make regular overpayments, which is usually where the real decision sits.
What matters most
- The key outputs are monthly repayment, payoff time and total interest. Read all three together before deciding.
- A lower monthly figure can still mean paying for the borrowing far longer than necessary.
- What to test next: shorter term versus lower monthly cost, regular overpayments versus keeping spare cash, and your current loan versus any refinance offer.
Decision two
Where does the estimate flatter the plan?
A lower monthly figure can still mean paying for the borrowing far longer than necessary. A neat output can hide that until you push the inputs harder.
Decision three
What should you compare next?
Run the base case, then compare shorter term vs lower monthly cost, overpay vs keep spare cash, and current loan vs refinance. That usually tells you more than staring at one answer.
Before you calculate
Check whether the loan repayment plan works under normal life, not just on paper
This calculator is most useful when you enter the figures you could actually live with: the loan amount, the real APR, the full term and any overpayment you could maintain without cannibalising the rest of your budget.
You should then read the result in three layers: whether the monthly payment is comfortably affordable, whether the total cost still looks sensible, and whether a small change to the term or overpayment sharply improves the outcome. If the plan only works in a very generous version of your budget, it needs more pressure-testing.
Calculator
Model the decision before you sign the agreement
Use figures you could keep up with in an ordinary month. The goal is to see the real monthly cost, the total interest and whether a shorter term or overpayment improves the loan enough to justify the higher payment.
Calculator
Enter your details and select Calculate to view estimated monthly repayments, total interest and the full cost of the loan.
Results
Your estimated repayment summary appears here after calculation.
Repayment snapshot
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Estimated monthly repayment for this loan scenario.
Payoff date
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Loan amount
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Interest
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Calculate to see the full summary for this scenario.
Payment timeline
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Interpret the result
What your results mean
The monthly repayment is the first number most people look at, but it should never be read on its own. The better question is whether the payment, the payoff time and the total interest still look acceptable when you put them side by side.
How long will it take to repay?
If the term stretches much longer than you expected, the loan may be affordable month to month but inefficient overall. A longer term usually means paying for the borrowing for longer than necessary, even when the APR itself looks reasonable.
How much will this cost in total?
If the interest becomes a large slice of the amount borrowed, the loan is expensive even if the monthly payment seems manageable. This is especially easy to miss on longer terms, where the cost is spread thinly across more months.
What to do next based on your results
- If the payment is manageable but the total interest is high, test a shorter term and see whether the higher payment still fits.
- If a small overpayment cuts a large amount of interest or several months off the term, you have a clear leverage opportunity.
- If the payment already feels tight, be careful about forcing overpayments. A stable plan is better than an ambitious one that collapses after a few months.
Worked example: Scenario A vs Scenario B
Suppose you borrow £10,000 at 7.9% APR. Scenario A uses a 5-year term with no overpayment. Scenario B keeps the same loan and rate but adds a fixed £50 monthly overpayment.
In Scenario A, the loan clears in 5 years and the total interest comes to about £2,144. In Scenario B, the loan clears in about 4 years and 2 months and the total interest falls to about £1,711.
That saves roughly 10 months and about £433 in interest.
When to take further action
If you are struggling to make the contractual payment, using credit for everyday costs, carrying several debts alongside the loan, or seeing no real progress despite months of paying, step back and review the wider position. In that situation, compare lower-cost options, simplify the repayment structure where possible, and consider whether a broader debt strategy makes more sense than pushing harder on the same plan.
What this result does not do for you
- A lower monthly payment does not automatically mean a better loan if the term becomes much longer.
- The estimate assumes the APR and fee structure stay exactly as entered.
- Overpayments only help if you can maintain them consistently without borrowing elsewhere.
- Treat the result as a decision tool, not a lender quote or guarantee.
Compare next
Compare the options that change the result most
Put these side by side and focus on the trade-off you will actually feel each month and over the full term.
Shorter term
Best when: You can handle a higher monthly payment and want to cut total interest decisively.
Main drawback: The payment becomes less flexible if your budget tightens.
Regular overpayments
Best when: You want to keep the original term but reduce interest whenever cash flow allows.
Main drawback: Some loans limit overpayments or charge for them, so the real benefit depends on your terms.
Refinance or replace the loan
Best when: You can secure a clearly lower APR or a better structure than the current loan.
Main drawback: Fees, eligibility and a longer replacement term can wipe out the headline saving.
What this page cannot decide for you
It cannot predict lender approval, exact quoted terms or what your budget does next. Use it to rule out weak repayment plans, not to assume a neat-looking monthly payment automatically makes the borrowing sensible.
How to use the result well
Run three versions: the quoted loan, a shorter term, and an overpayment version you could maintain without strain. If one version lowers the total cost sharply without making the monthly payment unrealistic, you have a stronger basis for a decision.
FAQ
Personal loan repayment calculator questions people actually ask
What APR should I use?
Use the representative APR from the quote you are genuinely considering. Your actual rate may differ after affordability and credit checks, so the calculator is strongest when you update it with the rate you are most likely to be offered rather than the most attractive headline example.
Why does my lender quote a slightly different monthly payment?
Lenders can calculate interest daily, round figures differently and handle fees in different ways. Small differences are normal, especially if a fee is added to the balance or collected upfront. Use the result here as a solid planning figure, then compare it with the lender’s own breakdown before agreeing to the loan.
Does overpaying always reduce interest?
Usually, yes. Reducing the balance earlier leaves less for interest to build on, so the total cost falls and the loan often clears sooner. The main exception is where the lender limits overpayments or charges for them, so check the terms before relying on that strategy.
What happens if the APR is 0%?
If APR is 0%, the borrowing cost comes from the amount borrowed and any fee you include. The monthly repayment is simply the total financed balance divided across the term. Overpayments still shorten the term because they reduce the balance faster.
Should I choose a longer term for a lower payment?
A longer term often lowers the monthly payment but raises the total interest. It can be the right choice if cash flow is genuinely tight, but it is not automatically the better deal. Compare the monthly relief against the extra cost and ask whether the shorter option is still realistic.
Is a personal loan cheaper than credit card borrowing?
Often, yes, but only if the APR is clearly lower and the term does not undo the saving. A personal loan can cut interest and give you a fixed end date, but you should still compare fees, flexibility and whether a strong 0% balance transfer is available for any card debt you are replacing.
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