Car Equity Calculator
What the car is worth against what you still owe.
Work out Car Equity. What the car is worth against what you still owe. Shows the total alongside the monthly, because they disagree more often than not.
Trade-in value is the figure a dealer will work from.
Varies widely by model — use a valuation guide.
Depreciation rates vary enormously by make, model and fuel type, so they are inputs here rather than numbers this page asserts. Take the projection as a shape rather than a valuation, and use a recognised guide for the specific model.
Negative equity
−$3,000
you owe more than the car is worth
Trading in now does not clear the $3,000 shortfall — it moves it into the next loan, on a car that will also depreciate. That is how a small negative equity becomes a large one, and it is the commonest reason a dealer quote lands far above what price minus deposit predicted.
How the Car Equity Calculator works
Equity is what the car is worth less what you still owe, and it is the number a trade-in actually turns on. Negative equity does not disappear when you trade the car in — it gets added to the next loan, which is the commonest reason a dealer quote lands far above what a simple price-minus-deposit sum predicted.
Also known as: negative equity car loan calculator · upside down car loan calculator · car loan to value calculator · LTV calculator car
The calculation itself
Equity is what the car is worth less what you still owe. Loan-to-value is the balance as a percentage of the value; above 100% you are underwater.
It is a comparison between two curves. The loan balance falls on a schedule fixed at signing. The car's value falls fastest in the first year and flattens after. When the second falls below the first, you are upside down, and you stay there until the schedule catches up.
Depreciation here is modelled on a declining balance with rates you supply, because there is no universal curve — it varies by make, model and fuel type more than any single figure could capture.
In practice
A car worth $18,000 with $21,000 still owing is $3,000 underwater, at a loan-to-value of 116.7%.
Trace how it got there. A $32,000 car losing 20% in year one and 15% in year two is worth $25,600 then $21,760 — $10,240 of value gone in 24 months, while a 72-month loan has repaid maybe a quarter of its principal.
Trading in now does not clear the $3,000. It moves it into the next loan, on a car that will also depreciate, at a larger balance. That is how a modest negative equity compounds into a serious one over two or three trades.
It is also the commonest reason a dealer's quote lands far above what price minus deposit predicted. The shortfall did not disappear; it was rolled in.
Where the figure deceives
There is no single value for a car. A private-party valuation, a trade-in valuation and an instant-offer price can differ by thousands, and the trade-in figure is the one a dealer works from — use it for the conservative answer.
The depreciation rates here are inputs and should be treated as a shape rather than a valuation. Some models hold value far better than the defaults; others, particularly at the luxury end and in fast-moving segments, do considerably worse.
Being underwater is not an emergency on its own. It matters when you need to sell, when you want to refinance, and if the car is written off — gap insurance exists precisely for that third case, and is worth its cost mainly while the gap is large.
Acting on it
If you are underwater, the cheapest route out is usually to keep the car and let the two curves converge. Every month of ordinary payments narrows the gap.
Do not roll negative equity into a new loan unless the alternative is worse. It converts a problem that resolves itself into one that grows.
If you are refinancing, check loan-to-value first. It is what the lender will look at, and knowing the number saves an application that was never going to be approved.
Not financial advice. This calculator is for planning and illustration, not financial advice. Real products carry fees, taxes, and terms it does not model. Confirm figures with your lender or a qualified adviser before committing.
Frequently asked questions
What does it mean to be upside down on a car loan?
You owe more than the car is worth. It happens because cars lose value fastest in the first year while a long loan pays down principal slowly, so the two lines cross and stay crossed for a while.
How do I get out of negative equity?
Pay it down, or keep the car until the balance falls below its value. Trading out of it moves the shortfall into a new, larger loan on a car that will also depreciate — which is how a small negative equity becomes a large one.
What is loan-to-value on a car?
The balance as a percentage of the car's value. Above 100% you are underwater. Lenders use it to decide what they will refinance, which is why it is worth knowing before applying rather than after being declined.
Does a bigger down payment prevent this?
Largely, yes. A deposit big enough to cover the first year's depreciation keeps you the right way up from the start, which is the reasoning behind the conventional twenty percent.
How do I find what my car is actually worth?
Take a private-party and a trade-in valuation from a recognised guide and treat them as a range rather than a figure — the trade-in number is the one a dealer will work from, and it is the lower of the two.
Put this calculator on your own site
Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.
<iframe src="https://www.thecalclibrary.com/embed/car-equity-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Car Equity Calculator"></iframe>The only condition is that the credit line stays visible. It sits inside the frame, so you do not have to do anything to keep it.