What a Kitchen Remodel Really Earns.

Every time you spend money hoping to get more back — buying a stock, a rental, a delivery van, or a new kitchen — you are making an investment, whether or not you call it one. And every investment invites the same blunt question: was it worth it? Return on investment, almost always shortened to ROI, is the number that answers it. It measures how much profit or loss you earned relative to what the whole thing cost you, expressed as a percentage. It is the most widely used measure of a good decision in all of finance, and also one of the most widely misused.

The appeal of ROI is that it is honest and simple. It does not care how exciting the investment sounded or how hard you worked on it — only whether more money came out than went in. The danger of ROI is that same simplicity: it quietly ignores time, risk, and every cost you forgot to count. This piece walks through the formula on a real decision — a kitchen remodel — and shows both what ROI tells you clearly and what it leaves out.

The Formula

Profit, divided by what it cost.

ROI has exactly one formula, and it is worth seeing in plain words before any dollars are attached:

ROI = net profit or loss ÷ total cost.

The net profit or loss is everything you got back minus everything you put in. Everything you got back — the total proceeds — is the final value of the investment plus any income it paid you along the way. Everything you put in — the total cost — is the original purchase price plus any extra costs it took to own it. Subtract one from the other, divide by the cost, and you have ROI.

A quick, clean example. You buy $10,000 of a stock, pay $100 in commissions, collect $300 in dividends while you hold it, and sell for $11,500. Your total cost is $10,100 and your total proceeds are $11,800, so your net profit is $1,700. Divide $1,700 by $10,100 and you get an ROI of about 16.83%. A positive ROI is a gain; a negative one is a loss; a zero means you broke even.

A Real Decision

The $40,000 kitchen.

Now a decision with more moving parts. Suppose you spend $40,000 gutting and rebuilding a dated kitchen — new cabinets, counters, appliances, lighting, floor. A local agent tells you a kitchen like that should lift your home's resale value by about $50,000. Eighteen months later you sell, and the house does fetch roughly that much more than it would have before.

Run the formula. Your total cost is the $40,000 you spent. Your total proceeds — the value the project added — is $50,000. The net gain is $10,000, and $10,000 ÷ $40,000 is an ROI of 25%. Put another way, the kitchen recouped 125% of its cost: every dollar spent came back as $1.25. On its face, a clear win.

Where ROI Is Strong

It is honest, comparable, and hard to fake.

Two things make ROI the workhorse it is. First, it is a ratio, not a raw dollar figure, so it puts investments of wildly different sizes on the same footing. A $10,000 profit on the kitchen and a $500 profit on a small stock position are hard to compare as dollars, but as ROI — 25% versus, say, 5% — the better use of money is obvious. Second, it forces every cost into the open. Done properly, ROI has no room for the money you would rather not think about: the commission, the closing costs, the permit fees. If you count them, the percentage drops, and it should.

That is exactly why ROI is the right tool for a single, self-contained decision like this one: a known amount of money in, a known amount out, and a simple question of whether the second was bigger than the first.

Where ROI Misleads

It says nothing about time.

Here is the first and biggest weakness. A 25% ROI sounds the same whether you earned it in six months or sixty years — the formula never mentions time. But those are not remotely the same investment. To make ROIs comparable across different holding periods, you convert the total return into an annualized return: the steady yearly rate that, compounding each year, would produce the same result. The formula is (total proceeds ÷ total cost) raised to the power of (1 ÷ years), minus one.

For the kitchen, held eighteen months — 1.5 years — that works out to about 16% a year. The 25% didn't shrink; it's just spread honestly across the time it took to earn. Sixteen percent a year is still excellent. But notice how different the story would feel if the same 25% had taken ten years: the annualized return would be barely 2.3% a year, worse than a savings account. Same ROI, completely different investment. Whenever you compare two options held for different lengths of time, the annualized return — not the raw ROI — is the number that keeps you honest.

And it flatters the average remodel.

The kitchen case used a cheerful assumption: that the project added more value than it cost. That does happen, but it is not the rule. Remodeling Magazine's 2025 Cost vs. Value Report, which compares typical project costs against the resale value they retain across 119 U.S. markets, found that a midrange minor kitchen remodel — refreshing cabinets, counters, and appliances rather than gutting the room — cost about $28,458 and recouped roughly $32,141 at resale, or 113% of its cost.¹ That clears 100%, which is unusual for any interior project.

Go bigger and the math inverts. A midrange major kitchen remodel in the same report cost about $82,793 but added only $42,130 in resale value — recouping just 51% of its cost. As an ROI, that is roughly −49%: for every dollar spent, only about fifty cents came back at sale.¹ An upscale major kitchen did worse still, recouping about 36%. The lesson is not that kitchens are bad investments; it is that "kitchen remodel" describes projects with ROIs ranging from strongly positive to deeply negative, and ROI is the tool that tells them apart.

It ignores the costs of selling — and of waiting.

Return to our $40,000 kitchen. The clean 25% assumed the full $50,000 of added value lands in your pocket. Selling a house is not free. Agent commissions, closing costs, and any staging or repairs come out of the sale, and while some of that is charged on the whole house rather than the remodel, it still eats into the gain the kitchen produced. The eighteen months you waited weren't free either: you paid property taxes, insurance, and upkeep the whole time.

There is also the matter of whether the $50,000 was ever real. It was an estimate — an agent's opinion of what the kitchen would add. Until the house actually sells, that gain is unrealized: a number on paper that can move with the market. Only when the sale closes does it become a realized return, a gain you can count. If the true added value came in at the national-average 113% instead of 125% — about $45,000 rather than $50,000 — the ROI falls from 25% to 12.5%, and the annualized return from 16% to about 8% a year. Still positive, but a reminder that the headline number was the best case, not the only one.

A Few More Examples

The same formula, very different investments.

ROI travels well because almost any spending decision can be framed as cost in, value out. A rental property counts the purchase and holding costs against the rent collected plus resale value. Business equipment weighs the price against the added revenue or labor it saves. A marketing campaign compares its spend against the sales it generated. Even education can be viewed this way — tuition and lost work time against higher lifetime earnings.

But that last group comes with a warning. For a stock, both the cost and the payoff are hard numbers. For a kitchen, a campaign, or a degree, the "value out" is an estimate, and some of the payoff never shows up in dollars at all — the kitchen you actually enjoy cooking in, the brand more people recognize, the career you find more flexible. The 2025 Remodeling Impact Report from the National Association of Realtors makes the split vivid: homeowners gave a kitchen upgrade a perfect "Joy Score" of 10 for the satisfaction it brought, even though kitchens don't rank among the top projects for cost recovery.² ROI can measure the money. It cannot measure the joy, and it is a mistake to pretend the money is the whole story.

What ROI Leaves Out

Risk, taxes, and inflation.

Beyond time, ROI is silent on risk. Two investments can post the same 25% return while one was nearly a sure thing and the other a coin flip; ROI reports them identically. It is also a pre-tax, pre-inflation number by default. A gain can be taxed when you realize it, and the dollars you get back years later buy a little less than the dollars you put in, because inflation — the slow rise in prices — erodes what money is worth over time. None of this makes ROI wrong. It makes ROI a starting point: the first question to ask about an investment, not the last.

The Bottom Line

A great first number, a poor last word.

ROI earns its popularity. It is simple, it is comparable, and — used honestly — it is hard to argue with, because it counts every dollar in and every dollar out. Our kitchen returned a genuine 25%, about 16% a year, and the formula is what let us say so with confidence.

But the same simplicity is its trap. ROI says nothing about how long you waited, how much you risked, what the taxman takes, or whether the payoff you're counting is real yet or just an appraiser's guess. So use it first and use it often — then, before you decide, ask the questions ROI can't: over what time, at what risk, and net of what costs? Answer those, and a good ROI becomes a good decision.