yCalculator

Auto Loan Calculator

Last updated: April 2026

GBP
GBP
GBP
GBP
%
GBP
months
APR

Monthly payment

£521.99

Loan amount

£27,000.00

Total interest

£4,319.40

Total paid

£31,319.40

Sales tax

£0.00

Loan breakdown

Taxable amount£30,000.00
Total loan payments£31,319.40
Total cost including down payment£34,319.40

Related calculators:

  • Cash Back or Low Interest Calculator
  • Auto Lease Calculator

How does an auto loan calculator work?

An auto loan calculator estimates the financed amount from the car price, down payment, trade-in, taxes, and fees, then calculates a monthly payment from the APR and loan term.

How car loan interest is calculated

Most car loans use amortised monthly payments. Each payment covers interest on the remaining balance plus part of the loan principal.

How down payment and trade-in affect payments

A larger down payment or positive trade-in value reduces the amount financed, which usually lowers the monthly payment and interest cost.

About this calculator

The Auto Loan Calculator estimates monthly car finance payments from the amount borrowed, interest rate, loan term, and deposit. It is useful when comparing car loans, checking dealer finance, deciding whether to increase a deposit, or understanding the total cost of borrowing. The monthly payment is only part of the decision: total interest, fees, balloon payments, and affordability over the whole term also matter.

Loan payment formula

Most fixed-rate car loans use an amortisation formula, where each monthly payment covers interest plus some principal.

  • Monthly payment = P x r x (1 + r)^n / ((1 + r)^n - 1)
  • P = amount borrowed, r = monthly interest rate, n = number of months

How the calculator works

  1. Enter car price, deposit, interest rate, and term.
  2. The calculator estimates the amount financed.
  3. It applies the monthly interest rate over the loan term.
  4. The result shows monthly payment, total interest, and total amount paid.

Worked examples

Typical loan

Input: Borrow GBP 15,000 at 7% for 48 months

Result: The calculator estimates the monthly repayment and total interest over four years.

Larger deposit

Input: Increase deposit by GBP 2,000

Result: The amount borrowed falls, reducing either the monthly payment or total interest.

Longer term

Input: Same loan over 60 months instead of 48

Result: Monthly payments may fall, but total interest usually increases.

How car loan repayments work

A car loan spreads the amount borrowed over a fixed term. Each monthly payment covers interest and repays part of the balance. The payment depends on the loan amount, interest rate, term, deposit, and any fees included in the finance.

The calculator is most useful for comparing scenarios. A lower monthly payment can look attractive, but it may come from a longer term that increases total interest.

Car finance cost components

The true cost of car finance is more than the monthly repayment. These components should be checked before signing an agreement.

Amount financed
The car price minus deposit, plus any fees or extras added to the finance.
Interest rate and APR
The interest rate affects monthly payments. APR can be more useful for comparing offers because it may include compulsory fees.
Loan term
A longer term reduces monthly payments but usually increases total interest and may leave you owing money for longer than you keep the car.
Running costs
Insurance, fuel or charging, maintenance, tyres, servicing, tax, and depreciation should be budgeted separately from the loan.

Comparing car finance offers

Compare total cost, not just the monthly figure. Check whether the deal includes a balloon payment, mileage limits, early settlement terms, dealer incentives, or optional extras. If the car may be sold before the end of the term, consider whether the outstanding finance could exceed the car value.

Loan, HP, PCP, and lease differences

A standard car loan is not the same as hire purchase, PCP, or leasing. With a personal loan, you usually own the car and owe the lender. With hire purchase, ownership normally transfers after the final payment. With PCP, a balloon payment may be needed to own the car. With leasing, you usually return the vehicle.

Finance typeHow it worksMain caution
Personal loanBorrow money separately and buy the car outrightYou owe the lender even if the car falls in value
Hire purchasePay deposit and monthly payments; ownership usually transfers at the endMissed payments can put the car at risk
PCPLower monthly payments with optional final balloon paymentMileage, condition, and final payment matter
LeaseLong-term rental with return at the endYou normally do not own the car

Depreciation and negative equity

Cars usually lose value over time. If the loan balance falls more slowly than the car value, you may owe more than the vehicle is worth. This can matter if you want to sell, settle early, or change cars before the finance term ends.

Affordability beyond the monthly payment

A car that is affordable on finance may still be expensive once insurance, servicing, MOT, tyres, repairs, fuel or charging, parking, congestion charges, and depreciation are included. Use the monthly finance payment as only one part of a transport budget.

Dealer finance vs direct lending

Dealer finance can be convenient because the car and finance are arranged together. Direct lending, such as a bank loan, can give you a clearer cash budget before visiting the dealer and may improve your negotiating position. The best option depends on APR, fees, deposit, incentives, early settlement terms, and whether the agreement is secured on the car.

Some dealers focus the conversation on monthly payment. Always ask for the total amount payable, APR, term, deposit, fees, optional final payment, and what happens if you settle early.

Part exchange and negative equity

A part exchange can reduce the cash price of the next car, but the dealer valuation may be lower than a private sale. If you still owe finance on the old car, the settlement figure must be cleared. When the old finance balance is higher than the trade-in value, the shortfall is negative equity and may be rolled into the new deal, increasing the cost.

Cash purchase vs car finance

Paying cash avoids interest and monthly finance commitments, but it uses savings that might be needed elsewhere. Financing preserves cash but adds interest and can encourage overbuying because the cost is framed as a monthly payment. Compare both the monthly affordability and the total cost before deciding.

Common mistakes and edge cases

  • Comparing monthly payment only and ignoring total cost.
  • Forgetting arrangement fees or dealer add-ons.
  • Choosing a longer term without checking total interest.
  • Ignoring balloon payments in PCP-style finance.
  • Assuming quoted finance is guaranteed before credit checks.

Limitations

This calculator provides an estimate only and is not financial or tax advice.

  • Actual finance depends on lender terms, credit approval, fees, and contract type.
  • It does not recommend a finance product.

Frequently asked questions

Does a bigger deposit reduce monthly payments?

Usually yes, because it reduces the amount borrowed.

Is a longer term cheaper?

It can reduce monthly payments but often increases total interest.

Does this include insurance and running costs?

No. It estimates finance payments, not the full cost of owning a car.

Can this compare dealer finance?

Yes, you can enter the dealer rate and term, but check fees and contract details separately.

Is this a finance offer?

No. It is a planning estimate only.

Related calculators

  • Auto Lease Calculator
  • Cash Back or Low Interest Calculator
  • EV vs Petrol Cost Calculator

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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