Car Affordability Calculator
Car affordability calculator — set a monthly budget (or a percentage of your income), with your deposit, trade-in, interest rate and term, and see the maximum car price you can finance and how much you can borrow. In your choice of currency. Runs in your browser.
Car Affordability Calculator
How to Use the Car Affordability Calculator
Set your budget
Choose a percentage of your take-home pay, or switch to a fixed monthly amount you are comfortable spending.
Add deposit and trade-in
Enter the cash you can put down and any trade-in value — both raise the price you can afford.
Set rate and term
Enter the APR and term to see how financing terms change your ceiling.
Read your ceiling
The maximum price, what you can borrow and the interest all update live. Treat the figure as a ceiling, not a target.
How Much Car Can You Really Afford?
Most people shop for a car the wrong way round: they fall for a model, find out the price, and then try to make the payments fit. A car affordability calculator flips that, starting from what you can comfortably pay each month and working out the most you should spend. It does this by running a normal car loan in reverse. Given the monthly payment you are willing to make, your interest rate and the term, it solves for the largest loan that payment can service, then adds your deposit and trade-in on top to arrive at a maximum car price. Setting that ceiling before you walk into a showroom is the single best defence against being talked up to a more expensive vehicle than your budget can bear.
The tool lets you frame the budget in the way that suits you. You can enter a fixed monthly amount, or — often more sensible — set it as a percentage of your take-home pay, which keeps the commitment proportionate to what you earn. A widely used guideline is to keep car loan payments under about fifteen per cent of take-home pay, with under ten per cent being genuinely comfortable; the tool flags this so you can sanity-check your choice. From there you can see exactly how the financing levers move the ceiling: a larger deposit or trade-in lifts the affordable price directly, a lower interest rate stretches the same payment further, and a longer term raises the price too — but at the cost of more total interest and a longer stretch of potential negative equity.
The most important caveat is one the headline number cannot show: the loan payment is not the cost of owning a car. Insurance, road tax, fuel or charging, parking and maintenance all sit on top, and together they can rival the payment itself. The biggest budgeting mistake is to spend the entire monthly allowance on the loan and leave nothing for running costs, so it is wise to treat the calculated maximum as a hard ceiling and aim comfortably below it. Affordability is also not the same as approval — a lender will look at your credit history, income and existing debts and may quote a different rate — so use this as a planning tool to shop with confidence, then confirm the details with the lender. Everything is computed in your browser from a transparent reverse-amortisation formula, with nothing you enter leaving your device.
Decide what you can pay before you fall in love with a model — the affordable price is a ceiling to stay under, not a target to hit.
10 Facts About Car Affordability
Affordability works backwards from a payment to a price.
A common guide: car payments under 15% of take-home pay.
A bigger deposit raises the price you can afford.
A longer term raises the price but adds interest.
A lower rate stretches the same budget further.
The payment is only part of the true cost of a car.
Insurance and fuel can rival the loan payment.
Trade-in value reduces what you need to borrow.
Affordability ≠ approval — lenders also check credit.
This calculator runs in your browser — nothing is uploaded.
Frequently Asked Questions
- It runs a normal car loan in reverse. Instead of starting from a price and finding the payment, it starts from the monthly payment you are comfortable with and works out the largest loan that payment can support at your rate and term. Adding your deposit and trade-in to that loan gives the maximum car price you can afford.
- Either works, and the tool offers both. A percentage of income keeps the payment proportionate to what you earn — a widely used guide is to keep car payments under about 15% of take-home pay, with under 10% being comfortable. A fixed amount is useful if you already know exactly what you can spare each month.
- Spreading the same payment over more months supports a larger loan, so the maximum price rises. But the trade-off is more total interest and a longer exposure to negative equity, since the car depreciates while you slowly repay. Affording a pricier car this way is not the same as it being a good idea.
- No. This is a budgeting tool that shows what fits your cash flow. A lender’s approval also depends on your credit history, income verification, existing debts and their own criteria, and they may offer a different rate. Use the result to set a sensible ceiling before you shop, then confirm with the lender.
- A lot, especially over long terms. A lower rate means less of your payment goes to interest, so more supports the principal and the affordable price rises. It is worth shopping rates and improving your credit before borrowing, because even a one-point difference can shift the affordable price noticeably.
- Yes — and this is the most common budgeting mistake. The loan payment is only part of owning a car; insurance, road tax, fuel, parking and maintenance all add up and in some cases rival the payment. Leave headroom in your budget for them rather than spending your entire allowance on the loan.
- Your deposit and trade-in are added on top of the maximum loan to give the maximum price, and because they are cash you are not borrowing, they also reduce interest and the risk of negative equity. Increasing the deposit raises the price you can afford without raising the monthly payment.
- Not necessarily. Just because a longer term or larger loan makes a pricier car “affordable” on paper does not mean it is wise — a cheaper car leaves room for savings, running costs and life’s surprises. Treat the maximum as a ceiling, not a target.
- Whichever you select. The currency is purely for display and formatting; the maths is the same everywhere. Pick the one that matches your income and the prices you are shopping.
- Completely free, with no account or usage limit. It runs entirely in your browser, collects no data, and works offline once the page has loaded.
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