CalZone Logo
User
UK Finance Toolkit

Personal Loan Calculator UK

Find out exactly how much a personal loan or car finance will cost you each month. See total interest paid and plan your debt repayments effectively.

Loan Details

£
%

Repayment Breakdown

Original Loan Amount£10,000.00
Total Interest Applied+ £1,460.70
Total Amount to Repay£11,460.70
Monthly PaymentFor 60 Months
£191.01

Loan Tips

  • Watch the APR

    Lenders advertise a 'Representative APR' but you might be offered a higher rate based on credit history.

  • Avoid Extended Terms

    Stretching a loan over 7 or 10 years lowers monthly costs, but dramatically increases total interest.

  • Early Repayment Rules

    Check if your lender charges a fee (ERC) if you try to clear your debt ahead of schedule.

Save your Quote

Applying for a car loan or consolidating debt? Export your calculated monthly breakdown into a clean PDF using the button in the calculator to compare directly with actual bank quotes.

The Ultimate Guide to UK Personal Loans (Updated 2026)

Whether you are funding a house extension, buying a new car, or consolidating multiple streams of aggressive credit card debt, taking out a personal loan is a serious financial commitment. The Loan Calculator UK above gives you absolute clarity on your upcoming debt structure.

How Personal Loan Interest is Calculated

In the UK, almost all personal loans operate on an amortization schedule. This means your monthly payment remains identical every single month, but the composition of that payment shifts over time.

During the first few months of a 5-year loan, a massive chunk of your £200 monthly payment is being swallowed by interest, and very little is actually knocking down the core amount you borrowed (the principal). However, by month 55, almost all of that £200 is destroying the principal, because the remaining balance generating interest is so small.

APR (Annual Percentage Rate) vs Simple Interest

The UK Financial Conduct Authority (FCA) requires lenders to display the true cost of borrowing using an APR figure. APR includes both the headline interest rate and any mandatory, unavoidable fees attached to the loan (like an arrangement fee).

  • Representative APR: You will often see ads for loans at "5.9% Representative APR". By law, this rate only needs to be offered to 51% of successful applicants. The remaining 49% could be offered 9.9%, 15%, or higher depending on their credit score.
  • Personal APR: This is the guaranteed rate you are actually offered after undergoing a hard credit check. This is the number you should plug into our calculator.

Secured vs Unsecured Loans

Our calculator defaults to logic used across Unsecured Personal Loans, which are the most common borrowing channel (usually between £1,000 and £35,000). Secured loans tie the debt against an asset (like your house). If you default on a secured loan, the lender can seize your home to recover the cash. Because the risk is purely on your shoulders, secured loans often carry cheaper interest rates.

Is it smart to take out a long-term loan?

When offered the choice between a 3-year term and a 7-year term for a £15,000 car loan, the 7-year term looks visually attractive because the monthly payment drops significantly. However, you are subjecting £15,000 to an extra 48 months of compound interest.

By playing with the Loan Term field in our calculator above, you can actively watch the "Total Interest Applied" number inflate as you stretch the loan duration out. The mathematical rule of thumb is to secure the shortest possible loan term that still leaves you a comfortable, safe monthly buffer in your budget.

Paying off a loan early (ERC)

Under the Consumer Credit Act, you possess a statutory right to clear a personal loan in full at any time. However, to compensate for lost interest, UK lenders are legally allowed to charge an Early Repayment Charge (ERC), which is universally capped at:

  • Up to 58 days' interest (roughly two months).

If you come into sudden wealth, paying the 58 days of penalty interest is still mathematically cheaper than letting the loan coast for another 3 years generating continuous interest.