APR Calculator

APR Guide

What is APR?

APR (Annual Percentage Rate) is the standardised rate that includes both the nominal interest rate and all mandatory fees, expressed as a yearly rate. UK law (Consumer Credit Act 1974) requires all credit advertisements to show the APR, enabling consumers to compare products on equal terms. A loan advertised at 8.9% nominal rate with a £250 arrangement fee has a higher APR than the headline rate suggests. The representative APR must be the rate offered to at least 51% of approved applicants — so two loans with identical headline rates can have very different APRs once fees are included, which is exactly why APR — not the headline rate — is the number to compare.

What's the difference between APR and EAR vs Nominal Rate?

Nominal rate: the base interest rate before compounding or fees. EAR (Effective Annual Rate): the actual yearly cost accounting for compounding frequency (monthly compounding produces a higher EAR than annual compounding at the same nominal rate). APR: EAR plus all mandatory fees spread over the loan term. Example: 0.8% monthly rate = 9.6% nominal = 10.03% EAR = higher APR if fees apply. For credit cards, AER is rarely meaningful — the balance changes constantly. For mortgages, the APRC (Annual Percentage Rate of Charge) is the standard comparison figure lenders must quote for mortgages, combining interest and most fees into one number.

What should I know about Comparing Loans Using APR?

APR allows direct comparison between loans with different structures. A loan at 9% nominal with a £200 fee versus one at 10% with no fee: the APR calculation reveals which is actually cheaper for your specific amount and term. Generally, fees matter more on short-term loans (where they are spread over fewer payments) and less on long-term loans (where they are diluted). Payday loans often have nominal rates of 1–3% per day, producing APRs of 1,500%+, which is why APR comparison is particularly important for short-term, high-cost credit, where a seemingly modest daily or weekly rate compounds into an enormous headline APR.

What should I know about Minimising Borrowing Costs?

Always compare APR rather than monthly payment (which can be reduced by extending the term while increasing total cost). Check for early repayment charges (ERCs) — some loans penalise you for paying off early, which matters if your circumstances might change. For mortgages, compare the APRC over the full mortgage term but also understand the initial deal period APR. For credit cards used for purchases (not cash advances), a 0% purchase period card has an effective APR of 0% during that period — — but reverts to the standard rate the moment it ends, so plan to clear the balance beforehand.

Why APR Exists: Making Different Loan Offers Comparable

Lenders can structure fees and interest in many different ways — a low headline interest rate paired with a large upfront arrangement fee, versus a higher rate with no fee at all — which makes comparing raw interest rates alone unreliable for finding the genuinely cheaper deal. APR (Annual Percentage Rate) solves this by folding mandatory fees into a single standardized annualized percentage, spread across the loan term, so two very differently structured offers can be compared on one consistent number. This is precisely why regulations generally require APR to be prominently quoted in credit advertising — it's designed as the greatest-common-denominator comparison tool across products that would otherwise be difficult to compare directly.

Representative APR vs. the Rate You'll Actually Be Offered

The APR advertised for a loan or credit product is typically a "representative APR," legally required to be the rate offered to at least a majority of successful applicants — not a guarantee of the rate any individual applicant will receive. Lenders price risk individually based on credit history, income, and other factors, so an applicant with a weaker credit profile may be offered a materially higher APR than the advertised representative figure, while a particularly strong applicant might occasionally be offered better. This is why it's worth treating an advertised APR as a ballpark for comparison shopping across providers, while recognizing that your personal, confirmed offer — given only after a credit check — is the number that actually matters for your final decision.

Why Two Loans With the Same APR Can Still Cost Different Amounts Overall

APR is designed to make loans comparable on a like-for-like basis, but two loans with an identical APR can still result in different total amounts paid if their terms differ in other ways the APR figure doesn't fully capture for every situation. APR assumes the loan runs its full term as scheduled, so a loan with a longer term at the same APR as a shorter one will typically result in more total interest paid in absolute terms, even though the rate used to compare them is identical, simply because interest has longer to accrue on the outstanding balance. Loans with the same APR can also differ in how fees are structured: some roll a large upfront fee into a lower ongoing rate to produce a given APR, while others charge a smaller fee and a slightly higher rate to reach the same APR figure, and the loan with the larger upfront fee can end up costing more overall for someone who repays early, since the fee has already been paid regardless of how much of the term is actually used. This is why APR is a useful starting point for comparing like-for-like offers of the same term and structure, but checking the total amount repayable over the actual expected lifespan of the loan, including any early repayment scenario, gives a more complete picture than APR alone.

Typical APR Ranges by Credit Product

APR varies hugely by product because lenders price in risk, term length and how the debt is secured. As a rough, current UK guide: mortgages typically run from around 4% to 6% APRC, secured personal loans and car finance commonly sit in the 6%-12% range, unsecured personal loans usually fall between 7% and 20% depending on your credit score and the amount borrowed, credit cards typically sit between 20% and 30% APR representative, and short-term or guarantor loans can run into triple digits because they are priced for higher default risk over a short period.

These bands move with the Bank of England base rate and the overall cost of funding, so treat them as a sense-check rather than a quote — the APR you're actually offered always depends on your own credit file, income and the specific lender's pricing model.

Worked Example: Comparing a 7% and an 8.5% APR Loan

APR only tells you the full story once you multiply it by the amount and the term, because a higher rate over a shorter term can cost less in total interest than a lower rate over a longer one. Suppose you're comparing two unsecured loans for £10,000: Loan A charges 7% APR over 5 years with monthly repayments of around £198, and Loan B charges 8.5% APR over 3 years with monthly repayments of around £316. Over its term, Loan A costs roughly £198 x 60 = £11,880 in total repayments, so about £1,880 in interest. Loan B costs roughly £316 x 36 = £11,376 in total repayments, so about £1,376 in interest — cheaper overall despite the higher headline APR, because the money is borrowed for 24 fewer months. This is the single most common mistake people make when 'APR shopping': picking the lowest rate without checking whether the term length has quietly made the loan more expensive in total. Always compare the total amount repayable alongside the APR, not the APR in isolation.

How Fees Are Folded Into the APR Calculation

One reason APR is more useful than the headline interest rate is that UK regulation requires upfront fees — arrangement fees, broker fees, and in many cases compulsory linked insurance — to be spread across the loan term and included in the APR figure. This is what allows two loans with an identical interest rate but different fee structures to show different APRs. A £15,000 car loan at 6% interest with no fees and the same loan at 6% interest with a £500 arrangement fee will not carry the same APR: the fee effectively increases the real cost of borrowing, and the APR calculation reflects that even though the 'interest rate' on paper looks the same. This is also why a 0% APR deal can still involve a cost if a deposit contribution or admin fee is baked into the price of the goods rather than shown as interest — always check what, if anything, has been added to the cash price before a 0% offer is applied.